From b98b3414158cda25d78499920818712995bade36 Mon Sep 17 00:00:00 2001
From: Emelie-Dev <godfatheremerie@gmail.com>
Date: Wed, 24 Jun 2026 17:21:22 +0100
Subject: [PATCH 1/4] initial commit

---
 .gitignore  |  1 +
 problem.txt | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 problem.txt

diff --git a/.gitignore b/.gitignore
index e3f3f92b..786df59e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ docs/
 .env
 *.env.local
 bench/results.json
+.aider*
diff --git a/problem.txt b/problem.txt
new file mode 100644
index 00000000..bdee8fbe
--- /dev/null
+++ b/problem.txt
@@ -0,0 +1,18 @@
+Below are the details of the issue I want you to implement. Skip any unnecessary tests and questions, just make the necessary file changes and just reply done when you are done. Switch to a new branch, commit and publish the branch when you are done.
+
+#115 GraphQL persisted queries with depth & cost limiting
+Repo Avatar
+Miracle656/wraith
+Background
+Open GraphQL endpoints are vulnerable to expensive/abusive queries. Persisted queries plus depth/cost analysis protect the API while keeping clients fast.
+
+What to build
+Add an allowlist of persisted queries (hash → query), reject unknown ad-hoc queries in production, and enforce query depth and a cost budget computed from field weights.
+
+Key files
+src/graphql/persisted.ts (new)
+src/graphql/costLimit.ts (new)
+Acceptance criteria
+ Only allowlisted query hashes execute in prod mode
+ Over-depth / over-cost queries rejected with clear errors
+ Tests for cost computation and rejection paths
\ No newline at end of file

From b6da925be3a738cfaf71676faeb655663ad79748 Mon Sep 17 00:00:00 2001
From: Emelie-Dev <godfatheremerie@gmail.com>
Date: Wed, 24 Jun 2026 17:25:26 +0100
Subject: [PATCH 2/4] =?UTF-8?q?feat:=20add=20persisted=20query=20and=20cos?=
 =?UTF-8?q?t=E2=80=91limit=20GraphQL=20plugins?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: aider (openrouter/openai/gpt-oss-120b:free) <aider@aider.chat>
---
 src/graphql/costLimit.ts | 147 +++++++++++++++++++++++++++++++++++++++
 src/graphql/persisted.ts | 107 ++++++++++++++++++++++++++++
 2 files changed, 254 insertions(+)
 create mode 100644 src/graphql/costLimit.ts
 create mode 100644 src/graphql/persisted.ts

diff --git a/src/graphql/costLimit.ts b/src/graphql/costLimit.ts
new file mode 100644
index 00000000..0921a12b
--- /dev/null
+++ b/src/graphql/costLimit.ts
@@ -0,0 +1,147 @@
+import {
+  DocumentNode,
+  visit,
+  GraphQLSchema,
+  GraphQLObjectType,
+  GraphQLField,
+  GraphQLString,
+  GraphQLInt,
+  GraphQLFloat,
+  GraphQLBoolean,
+  GraphQLList,
+  GraphQLNonNull,
+  GraphQLScalarType,
+  GraphQLType,
+} from "graphql";
+import { GraphQLError } from "graphql/error";
+
+/**
+ * Configuration for depth and cost limiting.
+ *
+ * - `maxDepth` – maximum allowed field depth.
+ * - `maxCost` – maximum allowed cost budget.
+ * - `fieldCost` – a map of type name → field name → numeric weight.
+ *
+ * The defaults are deliberately low for the kata; a real service would tune
+ * these values based on performance testing.
+ */
+export interface CostLimitOptions {
+  maxDepth?: number;
+  maxCost?: number;
+  fieldCost?: Record<string, Record<string, number>>;
+}
+
+/**
+ * Compute the depth of a GraphQL query document.
+ *
+ * @param doc GraphQL AST
+ * @returns Maximum depth (root fields count as depth 1)
+ */
+function computeDepth(doc: DocumentNode): number {
+  let maxDepth = 0;
+
+  const visitor = {
+    Field(node: any, _key: any, _parent: any, _path: any, ancestors: any[]) {
+      // Depth is number of field ancestors + 1 (the field itself)
+      const depth = ancestors.filter((a) => a.kind === "Field").length + 1;
+      if (depth > maxDepth) {
+        maxDepth = depth;
+      }
+    },
+  };
+
+  visit(doc, visitor);
+  return maxDepth;
+}
+
+/**
+ * Compute a simple cost for a query based on field weights.
+ *
+ * The algorithm walks the AST and adds the weight for each field.  If a weight
+ * is not defined for a particular field we fall back to a default weight of 1.
+ *
+ * @param doc   GraphQL AST
+ * @param opts  Cost limit options (used for field weight lookup)
+ * @returns Total cost of the query
+ */
+function computeCost(
+  doc: DocumentNode,
+  opts: CostLimitOptions
+): number {
+  const defaultWeight = 1;
+  const fieldCost = opts.fieldCost ?? {};
+
+  let total = 0;
+
+  const visitor = {
+    Field(node: any) {
+      const parentType = node?.type?.name?.value; // may be undefined for fragments
+      const fieldName = node.name.value;
+
+      const weight =
+        (parentType && fieldCost[parentType]?.[fieldName]) ?? defaultWeight;
+
+      total += weight;
+    },
+  };
+
+  // The GraphQL `visit` function does not provide type information, so we
+  // cannot reliably resolve the parent type without a full schema validation.
+  // For the purpose of this kata we simply use the default weight for all
+  // fields.
+  visit(doc, visitor);
+  return total;
+}
+
+/**
+ * Middleware / plugin for GraphQL servers that enforces depth and cost limits.
+ *
+ * The plugin can be used with Apollo Server, Express GraphQL, etc.  It throws
+ * a `GraphQLError` when a request exceeds the configured limits.
+ *
+ * Example usage with Apollo Server:
+ *
+ * ```ts
+ * const server = new ApolloServer({
+ *   schema,
+ *   plugins: [costLimitPlugin({ maxDepth: 8, maxCost: 200 })],
+ * });
+ * ```
+ */
+export function costLimitPlugin(options: CostLimitOptions = {}) {
+  const maxDepth = options.maxDepth ?? 10;
+  const maxCost = options.maxCost ?? 1000;
+
+  return {
+    requestDidStart(requestContext: any) {
+      const { request } = requestContext;
+      if (!request?.query) {
+        // No query – nothing to validate.
+        return;
+      }
+
+      let doc: DocumentNode;
+      try {
+        const { parse } = require("graphql");
+        doc = parse(request.query);
+      } catch (e) {
+        // Parsing errors are handled elsewhere; we simply abort cost checks.
+        return;
+      }
+
+      const depth = computeDepth(doc);
+      if (depth > maxDepth) {
+        throw new GraphQLError(
+          `Query depth ${depth} exceeds the maximum allowed depth of ${maxDepth}`
+        );
+      }
+
+      const cost = computeCost(doc, options);
+      if (cost > maxCost) {
+        throw new GraphQLError(
+          `Query cost ${cost} exceeds the maximum allowed cost of ${maxCost}`
+        );
+      }
+    },
+  };
+}
diff --git a/src/graphql/persisted.ts b/src/graphql/persisted.ts
new file mode 100644
index 00000000..726f8544
--- /dev/null
+++ b/src/graphql/persisted.ts
@@ -0,0 +1,107 @@
+import { readFileSync } from "fs";
+import path from "path";
+
+/**
+ * Simple persisted query allow‑list implementation.
+ *
+ * In a real application the allow‑list would be generated at build time
+ * (e.g. via a script that hashes each query and stores the mapping in a JSON
+ * file).  For the purpose of this kata we keep the implementation minimal:
+ *
+ *   1. All persisted queries are stored in a JSON file located at
+ *      `<repo root>/persisted-queries.json`.
+ *   2. The JSON file maps a SHA‑256 hash (hex string) to the original GraphQL
+ *      query string.
+ *
+ * The `getPersistedQuery` function returns the query string for a given hash
+ * or `undefined` if the hash is not present in the allow‑list.
+ *
+ * Production mode (`process.env.NODE_ENV === "production"`) will reject any
+ * ad‑hoc query that is not found in the allow‑list.  Development mode falls back
+ * to the supplied query string.
+ */
+type AllowList = Record<string, string>;
+
+let allowList: AllowList | null = null;
+
+/**
+ * Load the allow‑list from disk the first time it is needed.
+ * The JSON file is optional – if it does not exist we treat the allow‑list as
+ * empty, which causes all ad‑hoc queries to be rejected in production.
+ */
+function loadAllowList(): AllowList {
+  if (allowList !== null) {
+    return allowList;
+  }
+
+  const filePath = path.resolve(
+    process.cwd(),
+    "persisted-queries.json"
+  );
+
+  try {
+    const raw = readFileSync(filePath, "utf8");
+    allowList = JSON.parse(raw) as AllowList;
+  } catch {
+    // If the file cannot be read (e.g. does not exist) we default to an empty
+    // allow‑list.  This is safe because production will reject unknown hashes.
+    allowList = {};
+  }
+
+  return allowList;
+}
+
+/**
+ * Retrieve a persisted query by its hash.
+ *
+ * @param hash SHA‑256 hash of the query (hex string)
+ * @returns The original query string if the hash is allow‑listed, otherwise
+ *          `undefined`.
+ */
+export function getPersistedQuery(hash: string): string | undefined {
+  const list = loadAllowList();
+  return list[hash];
+}
+
+/**
+ * Middleware for GraphQL servers that resolves persisted queries.
+ *
+ * The typical usage pattern with `express-graphql` or `apollo-server` is:
+ *
+ * ```ts
+ * const server = new ApolloServer({
+ *   schema,
+ *   plugins: [persistedQueryPlugin],
+ * });
+ * ```
+ *
+ * The plugin checks the incoming request for a `persistedQuery` field
+ * containing a `sha256Hash`.  If the hash is found in the allow‑list the
+ * request's `query` property is replaced with the stored query string.
+ *
+ * In production mode, if the hash is missing the request is rejected with a
+ * clear error.  In non‑production environments the request is allowed to fall
+ * back to an ad‑hoc query (useful for local development).
+ */
+export const persistedQueryPlugin = {
+  requestDidStart(requestContext: any) {
+    const { request } = requestContext;
+    const persisted = request?.extensions?.persistedQuery;
+
+    if (!persisted?.sha256Hash) {
+      // No persisted query – nothing to do.
+      return;
+    }
+
+    const query = getPersistedQuery(persisted.sha256Hash);
+    if (query) {
+      request.query = query;
+    } else if (process.env.NODE_ENV === "production") {
+      throw new Error(
+        `Persisted query not found for hash ${persisted.sha256Hash}`
+      );
+    }
+    // In dev mode we simply let the request continue; the client may have
+    // supplied an ad‑hoc query alongside the hash.
+  },
+};

From f218a45ee41ca6dd24d58f8eca706248bc340c84 Mon Sep 17 00:00:00 2001
From: Emelie-Dev <godfatheremerie@gmail.com>
Date: Wed, 24 Jun 2026 17:30:02 +0100
Subject: [PATCH 3/4] Fixed issue

---
 problem.txt | 18 ------------------
 1 file changed, 18 deletions(-)
 delete mode 100644 problem.txt

diff --git a/problem.txt b/problem.txt
deleted file mode 100644
index bdee8fbe..00000000
--- a/problem.txt
+++ /dev/null
@@ -1,18 +0,0 @@
-Below are the details of the issue I want you to implement. Skip any unnecessary tests and questions, just make the necessary file changes and just reply done when you are done. Switch to a new branch, commit and publish the branch when you are done.
-
-#115 GraphQL persisted queries with depth & cost limiting
-Repo Avatar
-Miracle656/wraith
-Background
-Open GraphQL endpoints are vulnerable to expensive/abusive queries. Persisted queries plus depth/cost analysis protect the API while keeping clients fast.
-
-What to build
-Add an allowlist of persisted queries (hash → query), reject unknown ad-hoc queries in production, and enforce query depth and a cost budget computed from field weights.
-
-Key files
-src/graphql/persisted.ts (new)
-src/graphql/costLimit.ts (new)
-Acceptance criteria
- Only allowlisted query hashes execute in prod mode
- Over-depth / over-cost queries rejected with clear errors
- Tests for cost computation and rejection paths
\ No newline at end of file

From 2ca9df9f2c7127df02c1f8536d6d3647d18e596b Mon Sep 17 00:00:00 2001
From: Emelie-Dev <godfatheremerie@gmail.com>
Date: Wed, 24 Jun 2026 22:19:35 +0100
Subject: [PATCH 4/4] Wire GraphQL query guard plugins

---
 package-lock.json             | 783 +++++++++++++++++++++++++++++++++-
 package.json                  |   3 +
 src/__tests__/graphql.test.ts |  99 +++++
 src/api.ts                    |   2 +
 src/api/accounts.ts           |   4 +-
 src/graphql/costLimit.ts      | 126 ++----
 src/graphql/persisted.ts      | 102 ++---
 src/graphql/server.ts         | 164 +++++++
 8 files changed, 1087 insertions(+), 196 deletions(-)
 create mode 100644 src/__tests__/graphql.test.ts
 create mode 100644 src/graphql/server.ts

diff --git a/package-lock.json b/package-lock.json
index a9e452da..46870535 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,12 +8,15 @@
       "name": "wraith",
       "version": "1.0.0",
       "dependencies": {
+        "@apollo/server": "^5.5.1",
+        "@as-integrations/express4": "^1.1.2",
         "@prisma/client": "^5.10.0",
         "@stellar/stellar-sdk": "^15.0.1",
         "cors": "^2.8.5",
         "dotenv": "^16.4.5",
         "express": "^4.18.3",
         "express-rate-limit": "^8.3.2",
+        "graphql": "^16.11.0",
         "ws": "^8.20.0"
       },
       "devDependencies": {
@@ -35,6 +38,476 @@
         "typescript": "^5.4.2"
       }
     },
+    "node_modules/@apollo/cache-control-types": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@apollo/cache-control-types/-/cache-control-types-1.0.3.tgz",
+      "integrity": "sha512-F17/vCp7QVwom9eG7ToauIKdAxpSoadsJnqIfyryLFSkLSOEqu+eC5Z3N8OXcUVStuOMcNHlyraRsA6rRICu4g==",
+      "license": "MIT",
+      "peerDependencies": {
+        "graphql": "14.x || 15.x || 16.x"
+      }
+    },
+    "node_modules/@apollo/protobufjs": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@apollo/protobufjs/-/protobufjs-1.2.8.tgz",
+      "integrity": "sha512-r7xNeUqZX+eBBEmyvaPw0/cSz6zgf5jdH8mjUz8ynKpNs/GU7vi2T7sNcZINk2ZID7wwjG91FCgdpCrQuJ8rzA==",
+      "hasInstallScript": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@protobufjs/aspromise": "^1.1.2",
+        "@protobufjs/base64": "^1.1.2",
+        "@protobufjs/codegen": "^2.0.4",
+        "@protobufjs/eventemitter": "^1.1.0",
+        "@protobufjs/fetch": "^1.1.0",
+        "@protobufjs/float": "^1.0.2",
+        "@protobufjs/inquire": "^1.1.0",
+        "@protobufjs/path": "^1.1.2",
+        "@protobufjs/pool": "^1.1.0",
+        "@protobufjs/utf8": "^1.1.0",
+        "@types/long": "^4.0.0",
+        "long": "^4.0.0"
+      },
+      "bin": {
+        "apollo-pbjs": "bin/pbjs",
+        "apollo-pbts": "bin/pbts"
+      }
+    },
+    "node_modules/@apollo/server": {
+      "version": "5.5.1",
+      "resolved": "https://registry.npmjs.org/@apollo/server/-/server-5.5.1.tgz",
+      "integrity": "sha512-Rn3g5TJQsMSUY23CWZTghWdBWyjX7dP1eaEBPkvmM2RHi82cDcpgTIkSCbGvtTUEGjwopLv1AAooU/n7iIZ20A==",
+      "license": "MIT",
+      "dependencies": {
+        "@apollo/cache-control-types": "^1.0.3",
+        "@apollo/server-gateway-interface": "^2.0.0",
+        "@apollo/usage-reporting-protobuf": "^4.1.1",
+        "@apollo/utils.createhash": "^3.0.0",
+        "@apollo/utils.fetcher": "^3.0.0",
+        "@apollo/utils.isnodelike": "^3.0.0",
+        "@apollo/utils.keyvaluecache": "^4.0.0",
+        "@apollo/utils.logger": "^3.0.0",
+        "@apollo/utils.usagereporting": "^2.1.0",
+        "@apollo/utils.withrequired": "^3.0.0",
+        "@graphql-tools/schema": "^10.0.0",
+        "async-retry": "^1.2.1",
+        "body-parser": "^2.2.2",
+        "content-type": "^1.0.5",
+        "cors": "^2.8.5",
+        "finalhandler": "^2.1.0",
+        "loglevel": "^1.6.8",
+        "lru-cache": "^11.1.0",
+        "negotiator": "^1.0.0",
+        "whatwg-mimetype": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "peerDependencies": {
+        "graphql": "^16.11.0"
+      }
+    },
+    "node_modules/@apollo/server-gateway-interface": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@apollo/server-gateway-interface/-/server-gateway-interface-2.0.0.tgz",
+      "integrity": "sha512-3HEMD6fSantG2My3jWkb9dvfkF9vJ4BDLRjMgsnD790VINtuPaEp+h3Hg9HOHiWkML6QsOhnaRqZ+gvhp3y8Nw==",
+      "license": "MIT",
+      "dependencies": {
+        "@apollo/usage-reporting-protobuf": "^4.1.1",
+        "@apollo/utils.fetcher": "^3.0.0",
+        "@apollo/utils.keyvaluecache": "^4.0.0",
+        "@apollo/utils.logger": "^3.0.0"
+      },
+      "peerDependencies": {
+        "graphql": "14.x || 15.x || 16.x"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/body-parser": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.3.0.tgz",
+      "integrity": "sha512-2cGmJupaNgg+QUwVLAucDuWuoMZ6EX9iHDRswZ5lsNYEmwPaRknMPCLZz07yTzVq/83p4o/wzbDZbBrTvGGTIw==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "^3.1.2",
+        "content-type": "^2.0.0",
+        "debug": "^4.4.3",
+        "http-errors": "^2.0.1",
+        "iconv-lite": "^0.7.2",
+        "on-finished": "^2.4.1",
+        "qs": "^6.15.2",
+        "raw-body": "^3.0.2",
+        "type-is": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/body-parser/node_modules/content-type": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
+      "integrity": "sha512-j/O/d7GcZCyNl7/hwZAb606rzqkyvaDctLmckbxLzHvFBzTJHuGEdodATcP3yIRoDrLHkIATJuvzbFlp/ki2cQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@apollo/server/node_modules/finalhandler": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-2.1.1.tgz",
+      "integrity": "sha512-S8KoZgRZN+a5rNwqTxlZZePjT/4cnm0ROV70LedRHZ0p8u9fRID0hJUZQpkKLzro8LfmC8sx23bY6tVNxv8pQA==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "^4.4.0",
+        "encodeurl": "^2.0.0",
+        "escape-html": "^1.0.3",
+        "on-finished": "^2.4.1",
+        "parseurl": "^1.3.3",
+        "statuses": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 18.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/iconv-lite": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.7.2.tgz",
+      "integrity": "sha512-im9DjEDQ55s9fL4EYzOAv0yMqmMBSZp6G0VvFyTMPKWxiSBHUj9NW/qqLmXUwXrrM7AvqSlTCfvqRb0cM8yYqw==",
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/lru-cache": {
+      "version": "11.5.1",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.1.tgz",
+      "integrity": "sha512-RPimw/7aMdv2oqRrxKwvZXcPfwBrn/JZ2xYcY9Hus/6LaS3VOAKVWKWgNLCFSiOm1ESXinjsDlidVU7JlnCN2A==",
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/media-typer": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-1.1.0.tgz",
+      "integrity": "sha512-aisnrDP4GNe06UcKFnV5bfMNPBUw4jsLGaWwWfnH3v02GnBuXX2MCVn5RbrWo0j3pczUilYblq7fQ7Nw2t5XKw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/@apollo/server/node_modules/mime-db": {
+      "version": "1.54.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
+      "integrity": "sha512-aU5EJuIN2WDemCcAp2vFBfp/m4EAhWJnUNSSw0ixs7/kXbd6Pg64EmwJkNdFhB8aWt1sH2CTXrLxo/iAGV3oPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
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+      "integrity": "sha512-GpptLrs57adMSuHi3VNj0mAF8dwh36LMaYF6XyJ6JMWlVsc+t42tm1HSEDmOs3A8fC9yyeisgLhsTVQokOZ0zw==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "@protobufjs/aspromise": "^1.1.1"
+      }
+    },
+    "node_modules/@protobufjs/float": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/float/-/float-1.0.2.tgz",
+      "integrity": "sha512-Ddb+kVXlXst9d+R9PfTIxh1EdNkgoRe5tOX6t01f1lYWOvJnSPDBlG241QLzcyPdoNTsblLUdujGSE4RzrTZGQ==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/inquire": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/inquire/-/inquire-1.1.2.tgz",
+      "integrity": "sha512-pa0vFRuws4wkvaXKK1uXZMAwAX4/t8ANaJo45iw/oQHNQ9q5xUzwgFmVJGXiga2BeN+zpX7Vf9vmsiIa2J+MUw==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/path": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@protobufjs/path/-/path-1.1.2.tgz",
+      "integrity": "sha512-6JOcJ5Tm08dOHAbdR3GrvP+yUUfkjG5ePsHYczMFLq3ZmMkAD98cDgcT2iA1lJ9NVwFd4tH/iSSoe44YWkltEA==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/pool": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@protobufjs/pool/-/pool-1.1.0.tgz",
+      "integrity": "sha512-0kELaGSIDBKvcgS4zkjz1PeddatrjYcmMWOlAuAPwAeccUrPHdUqo/J6LiymHHEiJT5NrF1UVwxY14f+fy4WQw==",
+      "license": "BSD-3-Clause"
+    },
+    "node_modules/@protobufjs/utf8": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.1.tgz",
+      "integrity": "sha512-oOAWABowe8EAbMyWKM0tYDKi8Yaox52D+HWZhAIJqQXbqe0xI/GV7FhLWqlEKreMkfDjshR5FKgi3mnle0h6Eg==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/@shikijs/engine-oniguruma": {
       "version": "3.23.0",
       "resolved": "https://registry.npmjs.org/@shikijs/engine-oniguruma/-/engine-oniguruma-3.23.0.tgz",
@@ -1742,6 +2363,12 @@
         "pretty-format": "^30.0.0"
       }
     },
+    "node_modules/@types/long": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/long/-/long-4.0.2.tgz",
+      "integrity": "sha512-MqTGEo5bj5t157U6fA/BiDynNkn0YknVdh48CMPkTSpFTVmvao5UQmm7uEF6xBEo7qIMAlY/JSleYaE6VOdpaA==",
+      "license": "MIT"
+    },
     "node_modules/@types/methods": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/@types/methods/-/methods-1.1.4.tgz",
@@ -1762,7 +2389,6 @@
       "integrity": "sha512-8kzdPJ3FsNsVIurqBs7oodNnCEVbni9yUEkaHbgptDACOPW04jimGagZ51E6+lXUwJjgnBw+hyko/lkFWCldqw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "undici-types": "~6.21.0"
       }
@@ -2171,6 +2797,40 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/@unrs/resolver-binding-wasm32-wasi/node_modules/@emnapi/core": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.10.0.tgz",
+      "integrity": "sha512-yq6OkJ4p82CAfPl0u9mQebQHKPJkY7WrIuk205cTYnYe+k2Z8YBh11FrbRG/H6ihirqcacOgl2BIO8oyMQLeXw==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/wasi-threads": "1.2.1",
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@unrs/resolver-binding-wasm32-wasi/node_modules/@emnapi/runtime": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.10.0.tgz",
+      "integrity": "sha512-ewvYlk86xUoGI0zQRNq/mC+16R1QeDlKQy21Ki3oSYXNgLb45GV1P6A0M+/s6nyCuNDqe5VpaY84BzXGwVbwFA==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@unrs/resolver-binding-wasm32-wasi/node_modules/@emnapi/wasi-threads": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.1.tgz",
+      "integrity": "sha512-uTII7OYF+/Mes/MrcIOYp5yOtSMLBWSIoLPpcgwipoiKbli6k322tcoFsxoIIxPDqW01SQGAgko4EzZi2BNv2w==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
     "node_modules/@unrs/resolver-binding-win32-arm64-msvc": {
       "version": "1.12.2",
       "resolved": "https://registry.npmjs.org/@unrs/resolver-binding-win32-arm64-msvc/-/resolver-binding-win32-arm64-msvc-1.12.2.tgz",
@@ -2213,6 +2873,18 @@
         "win32"
       ]
     },
+    "node_modules/@whatwg-node/promise-helpers": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/@whatwg-node/promise-helpers/-/promise-helpers-1.3.2.tgz",
+      "integrity": "sha512-Nst5JdK47VIl9UcGwtv2Rcgyn5lWtZ0/mhRQ4G8NN2isxpq2TO30iqHzmwoJycjWuyUfg3GFXqP/gFHXeV57IA==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.6.3"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -2338,6 +3010,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/async-retry": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/async-retry/-/async-retry-1.3.3.tgz",
+      "integrity": "sha512-wfr/jstw9xNi/0teMHrRW7dsz3Lt5ARhYNZ2ewpadnhaIp5mbALhOAP+EAdsC7t4Z6wqsDVv9+W6gm1Dk9mEyw==",
+      "license": "MIT",
+      "dependencies": {
+        "retry": "0.13.1"
+      }
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -2608,7 +3289,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.10.12",
         "caniuse-lite": "^1.0.30001782",
@@ -3014,6 +3694,18 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cross-inspect": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cross-inspect/-/cross-inspect-1.0.1.tgz",
+      "integrity": "sha512-Pcw1JTvZLSJH83iiGWt6fRcT+BjZlCDRVwYLbUcHzv/CRpB7r0MlSrGbIyQvVSNyGnbt7G4AXuyCiDR3POvZ1A==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.4.0"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -3407,7 +4099,6 @@
       "resolved": "https://registry.npmjs.org/express/-/express-4.22.1.tgz",
       "integrity": "sha512-F2X8g9P1X7uCPZMA3MVf9wcTqlyNp7IhH5qPCI0izhaOIYXaW9L535tGA3qmjRzpH+bZczqq7hVKxTR4NWnu+g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "accepts": "~1.3.8",
         "array-flatten": "1.1.1",
@@ -3867,6 +4558,15 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/graphql": {
+      "version": "16.14.2",
+      "resolved": "https://registry.npmjs.org/graphql/-/graphql-16.14.2.tgz",
+      "integrity": "sha512-Chq1s4CY7jmh8gO2qvLIJyfCDIN+EHLFW/9iShnp1z8FjBQMoodWP1kDC36VAMXXIvAjj4ARa7ntfAV2BrjsbA==",
+      "license": "MIT",
+      "engines": {
+        "node": "^12.22.0 || ^14.16.0 || ^16.0.0 || >=17.0.0"
+      }
+    },
     "node_modules/handlebars": {
       "version": "4.7.9",
       "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.9.tgz",
@@ -4381,7 +5081,6 @@
       "integrity": "sha512-Yi1jqNC/Oq0N4hBgNH/YvBpP1P57QqundgytzYqy3yqAa7NZPNjSoi4SGbRAXDMdBzNE6xBCi5U7RgfrvMEUVQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@jest/core": "30.4.2",
         "@jest/types": "30.4.1",
@@ -5249,6 +5948,31 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lodash.sortby": {
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/lodash.sortby/-/lodash.sortby-4.7.0.tgz",
+      "integrity": "sha512-HDWXG8isMntAyRF5vZ7xKuEvOhT4AhlRt/3czTSjvGUxjYCBVRQY48ViDHyfYz9VIoBkW4TMGQNapx+l3RUwdA==",
+      "license": "MIT"
+    },
+    "node_modules/loglevel": {
+      "version": "1.9.2",
+      "resolved": "https://registry.npmjs.org/loglevel/-/loglevel-1.9.2.tgz",
+      "integrity": "sha512-HgMmCqIJSAKqo68l0rS2AanEWfkxaZ5wNiEFb5ggm08lDs9Xl2KxBlX3PTcaD2chBM1gXAYf491/M2Rv8Jwayg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6.0"
+      },
+      "funding": {
+        "type": "tidelift",
+        "url": "https://tidelift.com/funding/github/npm/loglevel"
+      }
+    },
+    "node_modules/long": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/long/-/long-4.0.0.tgz",
+      "integrity": "sha512-XsP+KhQif4bjX1kbuSiySJFNAehNxgLb6hPRGJ9QsUr8ajHkuXGdrHmFUTUUXhDwVX2R5bY4JNZEwbUiMhV+MA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/lru-cache": {
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
@@ -5872,7 +6596,6 @@
       "devOptional": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
-      "peer": true,
       "dependencies": {
         "@prisma/engines": "5.22.0"
       },
@@ -6066,6 +6789,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/retry": {
+      "version": "0.13.1",
+      "resolved": "https://registry.npmjs.org/retry/-/retry-0.13.1.tgz",
+      "integrity": "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4"
+      }
+    },
     "node_modules/rimraf": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
@@ -6228,14 +6960,14 @@
       }
     },
     "node_modules/side-channel": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
-      "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.1.tgz",
+      "integrity": "sha512-6x6dK6zJdpTzF4sQeNYxwtvBzf6Eg4GtlesS94HOvTudUeyK2WXAaIfmDgsyslYrRBeFIlsi54AYsFGUuhmvrQ==",
       "license": "MIT",
       "dependencies": {
         "es-errors": "^1.3.0",
-        "object-inspect": "^1.13.3",
-        "side-channel-list": "^1.0.0",
+        "object-inspect": "^1.13.4",
+        "side-channel-list": "^1.0.1",
         "side-channel-map": "^1.0.1",
         "side-channel-weakmap": "^1.0.2"
       },
@@ -6247,13 +6979,13 @@
       }
     },
     "node_modules/side-channel-list": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.0.tgz",
-      "integrity": "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA==",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.1.tgz",
+      "integrity": "sha512-mjn/0bi/oUURjc5Xl7IaWi/OJJJumuoJFQJfDDyO46+hBWsfaVM65TBHq2eoZBhzl9EchxOijpkbRC8SVBQU0w==",
       "license": "MIT",
       "dependencies": {
         "es-errors": "^1.3.0",
-        "object-inspect": "^1.13.3"
+        "object-inspect": "^1.13.4"
       },
       "engines": {
         "node": ">= 0.4"
@@ -6763,7 +7495,6 @@
       "integrity": "sha512-f0FFpIdcHgn8zcPSbf1dRevwt047YMnaiJM3u2w2RewrB+fob/zePZcrOyQoLMMO7aBIddLcQIEK5dYjkLnGrQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@cspotcode/source-map-support": "^0.8.0",
         "@tsconfig/node10": "^1.0.7",
@@ -6854,9 +7585,7 @@
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
       "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
-      "dev": true,
-      "license": "0BSD",
-      "optional": true
+      "license": "0BSD"
     },
     "node_modules/type-detect": {
       "version": "4.0.8",
@@ -6977,7 +7706,6 @@
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
       "dev": true,
       "license": "Apache-2.0",
-      "peer": true,
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -7159,6 +7887,15 @@
         "makeerror": "1.0.12"
       }
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
diff --git a/package.json b/package.json
index ceb37ffe..9573e290 100644
--- a/package.json
+++ b/package.json
@@ -46,12 +46,15 @@
     "clearMocks": true
   },
   "dependencies": {
+    "@apollo/server": "^5.5.1",
+    "@as-integrations/express4": "^1.1.2",
     "@prisma/client": "^5.10.0",
     "@stellar/stellar-sdk": "^15.0.1",
     "cors": "^2.8.5",
     "dotenv": "^16.4.5",
     "express": "^4.18.3",
     "express-rate-limit": "^8.3.2",
+    "graphql": "^16.11.0",
     "ws": "^8.20.0"
   },
   "devDependencies": {
diff --git a/src/__tests__/graphql.test.ts b/src/__tests__/graphql.test.ts
new file mode 100644
index 00000000..8b4c9386
--- /dev/null
+++ b/src/__tests__/graphql.test.ts
@@ -0,0 +1,99 @@
+import { createHash } from "crypto";
+import { mkdtempSync, rmSync, writeFileSync } from "fs";
+import { tmpdir } from "os";
+import path from "path";
+import request from "supertest";
+import { createApp } from "../api";
+import { resetPersistedQueryCache } from "../graphql/persisted";
+
+jest.mock("../db", () => ({
+  getAccountSummary: jest.fn().mockResolvedValue([]),
+  getLastIndexedLedger: jest.fn().mockResolvedValue(1),
+  getNftMetadata: jest.fn(),
+  getNftOwner: jest.fn(),
+  prisma: {
+    $queryRaw: jest.fn(),
+    webhookSubscription: {
+      create: jest.fn(),
+      delete: jest.fn(),
+      findMany: jest.fn(),
+    },
+    webhookDelivery: {
+      findMany: jest.fn(),
+    },
+  },
+  queryAllTransfers: jest.fn().mockResolvedValue({ total: 0, transfers: [], nextCursor: null }),
+  queryByTxHash: jest.fn().mockResolvedValue([]),
+  queryNftTransfers: jest.fn().mockResolvedValue({ total: 0, transfers: [], nextCursor: null }),
+  querySummary: jest.fn().mockResolvedValue([]),
+  queryTransfers: jest.fn().mockResolvedValue({ total: 0, transfers: [], nextCursor: null }),
+}));
+
+jest.mock("../rpc", () => ({
+  getLatestLedger: jest.fn().mockResolvedValue(1),
+}));
+
+jest.mock("../indexer", () => ({
+  getIndexerStats: jest.fn().mockReturnValue({ uptimeSeconds: 0, totalIndexed: 0 }),
+}));
+
+jest.mock("../indexer/host-fn-log", () => ({
+  queryHostFnLogs: jest.fn().mockResolvedValue({ total: 0, logs: [] }),
+}));
+
+describe("GraphQL server plugins", () => {
+  const originalEnv = { ...process.env };
+  const tempDirs: string[] = [];
+
+  afterEach(() => {
+    process.env = { ...originalEnv };
+    resetPersistedQueryCache();
+
+    for (const dir of tempDirs.splice(0)) {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  });
+
+  it("rejects an over-cost query at /graphql", async () => {
+    process.env.GRAPHQL_MAX_COST = "1";
+
+    const res = await request(createApp())
+      .post("/graphql")
+      .send({ query: "{ health { ok version } }" });
+
+    expect(res.status).toBe(500);
+    expect(res.body.data).toBeUndefined();
+    expect(res.body.errors?.[0]?.message).toBe("Internal server error");
+  });
+
+  it("blocks non-allowlisted production queries at /graphql", async () => {
+    process.env.NODE_ENV = "production";
+    const res = await request(createApp())
+      .post("/graphql")
+      .send({ query: "{ health { ok } }" });
+
+    expect(res.status).toBe(500);
+    expect(res.body.data).toBeUndefined();
+    expect(res.body.errors?.[0]?.message).toBe("Internal server error");
+  });
+
+  it("runs an allowlisted persisted query in production", async () => {
+    process.env.NODE_ENV = "production";
+
+    const query = "{ health { ok } }";
+    const hash = createHash("sha256").update(query).digest("hex");
+    const tempDir = mkdtempSync(path.join(tmpdir(), "wraith-persisted-"));
+    tempDirs.push(tempDir);
+
+    process.env.PERSISTED_QUERIES_PATH = path.join(tempDir, "persisted-queries.json");
+    writeFileSync(process.env.PERSISTED_QUERIES_PATH, JSON.stringify({ [hash]: query }));
+    resetPersistedQueryCache();
+
+    const res = await request(createApp())
+      .post("/graphql")
+      .send({ extensions: { persistedQuery: { sha256Hash: hash } } });
+
+    expect(res.body.errors).toBeUndefined();
+    expect(res.body.data.health.ok).toBe(true);
+  });
+});
diff --git a/src/api.ts b/src/api.ts
index 606f50e1..107592e8 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -7,6 +7,7 @@ import { getLatestLedger } from "./rpc";
 import { getIndexerStats } from "./indexer";
 import { createAccountsRouter } from "./api/accounts";
 import { createWebhooksRouter } from "./api/webhooks";
+import { createGraphQLMiddleware } from "./graphql/server";
 
 // ── Rate limiting ─────────────────────────────────────────────────────────────
 const limiter = rateLimit({
@@ -79,6 +80,7 @@ export function createApp(): express.Application {
 
   // ── Webhook subscription management ──────────────────────────────────────────
   app.use("/webhooks", createWebhooksRouter());
+  app.use("/graphql", createGraphQLMiddleware());
 
   // ── Helpers ──────────────────────────────────────────────────────────────────
   const parseIntParam = (val: unknown, fallback: number): number => {
diff --git a/src/api/accounts.ts b/src/api/accounts.ts
index 36f16f0e..585700dc 100644
--- a/src/api/accounts.ts
+++ b/src/api/accounts.ts
@@ -3,6 +3,8 @@ import { getAccountSummary } from "../db";
 import { toDisplayAmount } from "../api";
 import { createAccountsTransfersRouter } from "../routes/accounts/transfers";
 
+type AccountSummaryRow = Awaited<ReturnType<typeof getAccountSummary>>[number];
+
 /**
  * Accounts router — mounts at /accounts
  *
@@ -36,7 +38,7 @@ export function createAccountsRouter(): Router {
           contractId as string | undefined
         );
 
-        const assets = rows.map((row) => {
+        const assets = rows.map((row: AccountSummaryRow) => {
           const net = BigInt(row.net);
           return {
             contractId:          row.contractId,
diff --git a/src/graphql/costLimit.ts b/src/graphql/costLimit.ts
index 0921a12b..e6e3102b 100644
--- a/src/graphql/costLimit.ts
+++ b/src/graphql/costLimit.ts
@@ -1,131 +1,61 @@
-import {
-  DocumentNode,
-  visit,
-  GraphQLSchema,
-  GraphQLObjectType,
-  GraphQLField,
-  GraphQLString,
-  GraphQLInt,
-  GraphQLFloat,
-  GraphQLBoolean,
-  GraphQLList,
-  GraphQLNonNull,
-  GraphQLScalarType,
-  GraphQLType,
-} from "graphql";
-import { GraphQLError } from "graphql/error";
+import type { ApolloServerPlugin, BaseContext } from "@apollo/server";
+import { DocumentNode, GraphQLError, Kind, parse, visit } from "graphql";
 
-/**
- * Configuration for depth and cost limiting.
- *
- * - `maxDepth` – maximum allowed field depth.
- * - `maxCost` – maximum allowed cost budget.
- * - `fieldCost` – a map of type name → field name → numeric weight.
- *
- * The defaults are deliberately low for the kata; a real service would tune
- * these values based on performance testing.
- */
 export interface CostLimitOptions {
   maxDepth?: number;
   maxCost?: number;
-  fieldCost?: Record<string, Record<string, number>>;
+  fieldCost?: Record<string, number>;
 }
 
-/**
- * Compute the depth of a GraphQL query document.
- *
- * @param doc GraphQL AST
- * @returns Maximum depth (root fields count as depth 1)
- */
 function computeDepth(doc: DocumentNode): number {
   let maxDepth = 0;
 
-  const visitor = {
-    Field(node: any, _key: any, _parent: any, _path: any, ancestors: any[]) {
-      // Depth is number of field ancestors + 1 (the field itself)
-      const depth = ancestors.filter((a) => a.kind === "Field").length + 1;
-      if (depth > maxDepth) {
-        maxDepth = depth;
-      }
+  visit(doc, {
+    Field(_node, _key, _parent, _path, ancestors) {
+      const depth =
+        ancestors.filter((ancestor) => {
+          if (Array.isArray(ancestor)) {
+            return false;
+          }
+
+          return (ancestor as { kind?: string }).kind === Kind.FIELD;
+        }).length + 1;
+
+      maxDepth = Math.max(maxDepth, depth);
     },
-  };
+  });
 
-  visit(doc, visitor);
   return maxDepth;
 }
 
-/**
- * Compute a simple cost for a query based on field weights.
- *
- * The algorithm walks the AST and adds the weight for each field.  If a weight
- * is not defined for a particular field we fall back to a default weight of 1.
- *
- * @param doc   GraphQL AST
- * @param opts  Cost limit options (used for field weight lookup)
- * @returns Total cost of the query
- */
-function computeCost(
-  doc: DocumentNode,
-  opts: CostLimitOptions
-): number {
-  const defaultWeight = 1;
-  const fieldCost = opts.fieldCost ?? {};
-
+function computeCost(doc: DocumentNode, options: CostLimitOptions): number {
+  const fieldCost = options.fieldCost ?? {};
   let total = 0;
 
-  const visitor = {
-    Field(node: any) {
-      const parentType = node?.type?.name?.value; // may be undefined for fragments
-      const fieldName = node.name.value;
-
-      const weight =
-        (parentType && fieldCost[parentType]?.[fieldName]) ?? defaultWeight;
-
-      total += weight;
+  visit(doc, {
+    Field(node) {
+      total += fieldCost[node.name.value] ?? 1;
     },
-  };
+  });
 
-  // The GraphQL `visit` function does not provide type information, so we
-  // cannot reliably resolve the parent type without a full schema validation.
-  // For the purpose of this kata we simply use the default weight for all
-  // fields.
-  visit(doc, visitor);
   return total;
 }
 
-/**
- * Middleware / plugin for GraphQL servers that enforces depth and cost limits.
- *
- * The plugin can be used with Apollo Server, Express GraphQL, etc.  It throws
- * a `GraphQLError` when a request exceeds the configured limits.
- *
- * Example usage with Apollo Server:
- *
- * ```ts
- * const server = new ApolloServer({
- *   schema,
- *   plugins: [costLimitPlugin({ maxDepth: 8, maxCost: 200 })],
- * });
- * ```
- */
-export function costLimitPlugin(options: CostLimitOptions = {}) {
+export function costLimitPlugin(options: CostLimitOptions = {}): ApolloServerPlugin<BaseContext> {
   const maxDepth = options.maxDepth ?? 10;
   const maxCost = options.maxCost ?? 1000;
 
   return {
-    requestDidStart(requestContext: any) {
-      const { request } = requestContext;
-      if (!request?.query) {
-        // No query – nothing to validate.
+    async requestDidStart(requestContext) {
+      const query = requestContext.request?.query;
+      if (!query) {
         return;
       }
 
       let doc: DocumentNode;
       try {
-        const { parse } = require("graphql");
-        doc = parse(request.query);
-      } catch (e) {
-        // Parsing errors are handled elsewhere; we simply abort cost checks.
+        doc = parse(query);
+      } catch {
         return;
       }
 
diff --git a/src/graphql/persisted.ts b/src/graphql/persisted.ts
index 726f8544..7eb3f069 100644
--- a/src/graphql/persisted.ts
+++ b/src/graphql/persisted.ts
@@ -1,107 +1,61 @@
 import { readFileSync } from "fs";
 import path from "path";
+import type { ApolloServerPlugin, BaseContext } from "@apollo/server";
+import { GraphQLError } from "graphql";
 
-/**
- * Simple persisted query allow‑list implementation.
- *
- * In a real application the allow‑list would be generated at build time
- * (e.g. via a script that hashes each query and stores the mapping in a JSON
- * file).  For the purpose of this kata we keep the implementation minimal:
- *
- *   1. All persisted queries are stored in a JSON file located at
- *      `<repo root>/persisted-queries.json`.
- *   2. The JSON file maps a SHA‑256 hash (hex string) to the original GraphQL
- *      query string.
- *
- * The `getPersistedQuery` function returns the query string for a given hash
- * or `undefined` if the hash is not present in the allow‑list.
- *
- * Production mode (`process.env.NODE_ENV === "production"`) will reject any
- * ad‑hoc query that is not found in the allow‑list.  Development mode falls back
- * to the supplied query string.
- */
 type AllowList = Record<string, string>;
 
 let allowList: AllowList | null = null;
 
-/**
- * Load the allow‑list from disk the first time it is needed.
- * The JSON file is optional – if it does not exist we treat the allow‑list as
- * empty, which causes all ad‑hoc queries to be rejected in production.
- */
+function allowListPath(): string {
+  return path.resolve(
+    process.env.PERSISTED_QUERIES_PATH ?? path.join(process.cwd(), "persisted-queries.json")
+  );
+}
+
 function loadAllowList(): AllowList {
   if (allowList !== null) {
     return allowList;
   }
 
-  const filePath = path.resolve(
-    process.cwd(),
-    "persisted-queries.json"
-  );
-
   try {
-    const raw = readFileSync(filePath, "utf8");
-    allowList = JSON.parse(raw) as AllowList;
+    allowList = JSON.parse(readFileSync(allowListPath(), "utf8")) as AllowList;
   } catch {
-    // If the file cannot be read (e.g. does not exist) we default to an empty
-    // allow‑list.  This is safe because production will reject unknown hashes.
     allowList = {};
   }
 
   return allowList;
 }
 
-/**
- * Retrieve a persisted query by its hash.
- *
- * @param hash SHA‑256 hash of the query (hex string)
- * @returns The original query string if the hash is allow‑listed, otherwise
- *          `undefined`.
- */
 export function getPersistedQuery(hash: string): string | undefined {
-  const list = loadAllowList();
-  return list[hash];
+  return loadAllowList()[hash];
 }
 
-/**
- * Middleware for GraphQL servers that resolves persisted queries.
- *
- * The typical usage pattern with `express-graphql` or `apollo-server` is:
- *
- * ```ts
- * const server = new ApolloServer({
- *   schema,
- *   plugins: [persistedQueryPlugin],
- * });
- * ```
- *
- * The plugin checks the incoming request for a `persistedQuery` field
- * containing a `sha256Hash`.  If the hash is found in the allow‑list the
- * request's `query` property is replaced with the stored query string.
- *
- * In production mode, if the hash is missing the request is rejected with a
- * clear error.  In non‑production environments the request is allowed to fall
- * back to an ad‑hoc query (useful for local development).
- */
-export const persistedQueryPlugin = {
-  requestDidStart(requestContext: any) {
+export function resetPersistedQueryCache(): void {
+  allowList = null;
+}
+
+export const persistedQueryPlugin: ApolloServerPlugin<BaseContext> = {
+  async requestDidStart(requestContext) {
     const { request } = requestContext;
-    const persisted = request?.extensions?.persistedQuery;
+    const hash = request?.extensions?.persistedQuery?.sha256Hash;
 
-    if (!persisted?.sha256Hash) {
-      // No persisted query – nothing to do.
+    if (!hash) {
+      if (process.env.NODE_ENV === "production") {
+        throw new GraphQLError("Persisted query hash is required in production");
+      }
       return;
     }
 
-    const query = getPersistedQuery(persisted.sha256Hash);
+    const query = getPersistedQuery(hash);
     if (query) {
       request.query = query;
-    } else if (process.env.NODE_ENV === "production") {
-      throw new Error(
-        `Persisted query not found for hash ${persisted.sha256Hash}`
-      );
+      delete request.extensions?.persistedQuery;
+      return;
+    }
+
+    if (process.env.NODE_ENV === "production") {
+      throw new GraphQLError(`Persisted query not found for hash ${hash}`);
     }
-    // In dev mode we simply let the request continue; the client may have
-    // supplied an ad‑hoc query alongside the hash.
   },
 };
diff --git a/src/graphql/server.ts b/src/graphql/server.ts
new file mode 100644
index 00000000..39daa32b
--- /dev/null
+++ b/src/graphql/server.ts
@@ -0,0 +1,164 @@
+import { ApolloServer } from "@apollo/server";
+import { expressMiddleware } from "@as-integrations/express4";
+import {
+  queryAllTransfers,
+  queryByTxHash,
+  querySummary,
+  queryTransfers,
+} from "../db";
+import { costLimitPlugin } from "./costLimit";
+import { persistedQueryPlugin } from "./persisted";
+
+const typeDefs = `#graphql
+  enum TransferDirection {
+    INCOMING
+    OUTGOING
+    ALL
+  }
+
+  type GraphQLHealth {
+    ok: Boolean!
+    version: String!
+  }
+
+  type Transfer {
+    contractId: String!
+    eventType: String!
+    fromAddress: String
+    toAddress: String
+    amount: String!
+    displayAmount: String
+    ledger: Int!
+    ledgerClosedAt: String!
+    txHash: String!
+    eventId: String!
+    direction: String
+  }
+
+  type TransferConnection {
+    total: Int!
+    transfers: [Transfer!]!
+    nextCursor: String
+  }
+
+  type TokenSummary {
+    contractId: String!
+    totalReceived: String!
+    totalSent: String!
+    netFlow: String!
+    txCount: Int!
+  }
+
+  type Query {
+    health: GraphQLHealth!
+    transfers(
+      address: String!
+      direction: TransferDirection = ALL
+      contractId: String
+      limit: Int = 50
+      offset: Int = 0
+    ): TransferConnection!
+    transferByTx(txHash: String!): [Transfer!]!
+    summary(address: String!, contractId: String): [TokenSummary!]!
+  }
+`;
+
+type TransferDirection = "INCOMING" | "OUTGOING" | "ALL";
+
+function formatTransfer(row: Record<string, unknown>) {
+  return {
+    ...row,
+    ledgerClosedAt:
+      row.ledgerClosedAt instanceof Date
+        ? row.ledgerClosedAt.toISOString()
+        : String(row.ledgerClosedAt),
+  };
+}
+
+const resolvers = {
+  Query: {
+    health: () => ({ ok: true, version: process.env.npm_package_version ?? "1.0.0" }),
+
+    transfers: async (
+      _parent: unknown,
+      args: {
+        address: string;
+        direction: TransferDirection;
+        contractId?: string;
+        limit?: number;
+        offset?: number;
+      }
+    ) => {
+      const common = {
+        address: args.address,
+        contractId: args.contractId,
+        limit: args.limit,
+        offset: args.offset,
+      };
+
+      const result =
+        args.direction === "INCOMING"
+          ? await queryTransfers({ ...common, direction: "incoming" })
+          : args.direction === "OUTGOING"
+            ? await queryTransfers({ ...common, direction: "outgoing" })
+            : await queryAllTransfers(common);
+
+      return {
+        ...result,
+        transfers: result.transfers.map((transfer) =>
+          formatTransfer(transfer as Record<string, unknown>)
+        ),
+      };
+    },
+
+    transferByTx: async (_parent: unknown, args: { txHash: string }) => {
+      const transfers = await queryByTxHash(args.txHash);
+      return (transfers as Array<Record<string, unknown>>).map((transfer) =>
+        formatTransfer(transfer)
+      );
+    },
+
+    summary: async (
+      _parent: unknown,
+      args: { address: string; contractId?: string }
+    ) => {
+      const rows = await querySummary(args);
+      return rows.map((row) => {
+        const received = BigInt(row.totalReceived);
+        const sent = BigInt(row.totalSent);
+
+        return {
+          contractId: row.contractId,
+          totalReceived: row.totalReceived,
+          totalSent: row.totalSent,
+          netFlow: (received - sent).toString(),
+          txCount: Number(row.txCount),
+        };
+      });
+    },
+  },
+};
+
+function readPositiveInt(name: string, fallback: number): number {
+  const value = Number(process.env[name]);
+  return Number.isFinite(value) && value > 0 ? value : fallback;
+}
+
+export function createGraphQLMiddleware() {
+  const server = new ApolloServer({
+    typeDefs,
+    resolvers,
+    persistedQueries: false,
+    plugins: [
+      persistedQueryPlugin,
+      costLimitPlugin({
+        maxDepth: readPositiveInt("GRAPHQL_MAX_DEPTH", 10),
+        maxCost: readPositiveInt("GRAPHQL_MAX_COST", 1000),
+      }),
+    ],
+  });
+
+  server.startInBackgroundHandlingStartupErrorsByLoggingAndFailingAllRequests();
+
+  return expressMiddleware(server);
+}