diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index d767f2f4..2e8915e1 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -13,4 +13,5 @@
 /packages/delegation-core           @MetaMask/delegation
 /packages/delegation-deployments    @MetaMask/delegation
 /packages/smart-accounts-kit        @MetaMask/delegation
+/packages/x402   @MetaMask/delegation
 /packages/7715-permission-types     @MetaMask/delegation
diff --git a/packages/x402/CHANGELOG.md b/packages/x402/CHANGELOG.md
new file mode 100644
index 00000000..c10aef61
--- /dev/null
+++ b/packages/x402/CHANGELOG.md
@@ -0,0 +1,14 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- New @metamask/x402 package providing plugins to @x402 packages ([#236](https://github.com/MetaMask/smart-accounts-kit/pull/236))
+
+[Unreleased]: https://github.com/metamask/smart-accounts-kit/
diff --git a/packages/x402/LICENSE.APACHE2 b/packages/x402/LICENSE.APACHE2
new file mode 100644
index 00000000..49966a71
--- /dev/null
+++ b/packages/x402/LICENSE.APACHE2
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
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+   6. Trademarks. This License does not grant permission to use the trade
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+      agreed to in writing, Licensor provides the Work (and each
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+   9. Accepting Warranty or Additional Liability. While redistributing
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
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+
+   Copyright 2022 ConsenSys Software Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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diff --git a/packages/x402/LICENSE.MIT0 b/packages/x402/LICENSE.MIT0
new file mode 100644
index 00000000..74e1d3df
--- /dev/null
+++ b/packages/x402/LICENSE.MIT0
@@ -0,0 +1,16 @@
+MIT No Attribution
+
+Copyright 2022 ConsenSys Software Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify,
+merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/packages/x402/README.md b/packages/x402/README.md
new file mode 100644
index 00000000..e4dbb775
--- /dev/null
+++ b/packages/x402/README.md
@@ -0,0 +1,21 @@
+# @metamask/x402
+
+x402 adapters for ERC-7710 payment requirement publishing and payload creation.
+
+## Installation
+
+```bash
+yarn add @metamask/x402
+npm install @metamask/x402
+```
+
+## Exports
+
+- `x402Erc7710Client`
+- `x402Erc7710Server`
+- `x402ExactEvmErc7710ServerScheme`
+
+## Notes
+
+This package intentionally does not depend on `@metamask/smart-accounts-kit`.
+Consumers provide delegation payloads via `x402DelegationProvider`.
diff --git a/packages/x402/eslint.config.mjs b/packages/x402/eslint.config.mjs
new file mode 100644
index 00000000..b80d3437
--- /dev/null
+++ b/packages/x402/eslint.config.mjs
@@ -0,0 +1,52 @@
+// eslint-disable-next-line
+import baseConfig from '../../shared/config/base.eslint.mjs';
+
+const withX402NamingExceptions = baseConfig.map((entry) => {
+  const namingConventionRule =
+    entry.rules?.['@typescript-eslint/naming-convention'];
+
+  if (!Array.isArray(namingConventionRule)) {
+    return entry;
+  }
+
+  const [level, ...conventions] = namingConventionRule;
+
+  return {
+    ...entry,
+    rules: {
+      ...entry.rules,
+      '@typescript-eslint/naming-convention': [
+        level,
+        {
+          selector: ['class', 'typeAlias'],
+          filter: {
+            regex: '^x402[A-Z].*$',
+            match: true,
+          },
+          format: null,
+        },
+        ...conventions,
+      ],
+    },
+  };
+});
+
+const config = [
+  ...withX402NamingExceptions,
+  {
+    files: ['**/*.ts', '**/*.tsx'],
+    rules: {
+      'new-cap': [
+        'error',
+        {
+          newIsCap: true,
+          newIsCapExceptionPattern: '^x402[A-Z]',
+          capIsNew: true,
+          properties: true,
+        },
+      ],
+    },
+  },
+];
+
+export default config;
diff --git a/packages/x402/package.json b/packages/x402/package.json
new file mode 100644
index 00000000..0ad24c9f
--- /dev/null
+++ b/packages/x402/package.json
@@ -0,0 +1,74 @@
+{
+  "name": "@metamask/x402",
+  "version": "0.0.0",
+  "description": "x402 adapters for MetaMask smart accounts and ERC-7710",
+  "license": "(MIT-0 OR Apache-2.0)",
+  "type": "module",
+  "keywords": [
+    "MetaMask",
+    "Ethereum"
+  ],
+  "homepage": "https://github.com/metamask/smart-accounts-kit/tree/main/packages/x402#readme",
+  "bugs": {
+    "url": "https://github.com/metamask/smart-accounts-kit/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/metamask/smart-accounts-kit.git"
+  },
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.mjs",
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist/**",
+    "dist/"
+  ],
+  "exports": {
+    ".": {
+      "require": {
+        "types": "./dist/index.d.cts",
+        "default": "./dist/index.cjs"
+      },
+      "import": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.mjs"
+      }
+    },
+    "./package.json": "./package.json"
+  },
+  "engines": {
+    "node": "^18.18 || >=20"
+  },
+  "sideEffects": false,
+  "scripts": {
+    "build": "yarn typecheck && tsup",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run --coverage",
+    "test:watch": "vitest watch",
+    "lint": "yarn lint:eslint",
+    "lint:eslint": "eslint . --cache --ext js,ts",
+    "lint:fix": "yarn lint:eslint --fix",
+    "changelog:update": "../../scripts/update-changelog.sh @metamask/x402",
+    "changelog:validate": "../../scripts/validate-changelog.sh @metamask/x402"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  },
+  "peerDependencies": {
+    "@x402/core": "^2.12.0",
+    "@x402/evm": "^2.12.0",
+    "viem": "^2.31.4"
+  },
+  "devDependencies": {
+    "@metamask/auto-changelog": "^5.0.2",
+    "@x402/core": "^2.12.0",
+    "@x402/evm": "^2.12.0",
+    "eslint": "^9.39.2",
+    "prettier": "^3.5.3",
+    "tsup": "^8.5.0",
+    "typescript": "5.5.4",
+    "viem": "2.31.4",
+    "vitest": "^3.2.4"
+  }
+}
diff --git a/packages/x402/src/index.ts b/packages/x402/src/index.ts
new file mode 100644
index 00000000..03c9dfb3
--- /dev/null
+++ b/packages/x402/src/index.ts
@@ -0,0 +1,11 @@
+export {
+  x402Erc7710Client,
+  type x402DelegationProvider,
+  type x402DelegationPaymentPayload,
+  type x402PaymentRequirements,
+  type x402PaymentPayloadResult,
+  type x402SchemeNetworkClientLike,
+  type x402Erc7710ClientConfig,
+} from './x402Client';
+export { x402Erc7710Server, type x402Erc7710ServerConfig } from './x402Server';
+export { x402ExactEvmErc7710ServerScheme } from './x402ExactEvmErc7710ServerScheme';
diff --git a/packages/x402/src/x402Client.ts b/packages/x402/src/x402Client.ts
new file mode 100644
index 00000000..c2b0b02d
--- /dev/null
+++ b/packages/x402/src/x402Client.ts
@@ -0,0 +1,116 @@
+import { type Hex, getAddress, isHex } from 'viem';
+
+export type x402PaymentRequirements = {
+  scheme: string;
+  network: string;
+  asset: string;
+  amount: string;
+  payTo: string;
+  maxTimeoutSeconds: number;
+  extra?: Record<string, unknown>;
+};
+
+export type x402PaymentPayloadResult = {
+  x402Version: number;
+  payload: Record<string, unknown>;
+  extensions?: Record<string, unknown>;
+};
+
+export type x402DelegationPaymentPayload = {
+  delegationManager: Hex;
+  permissionContext: Hex;
+  delegator: Hex;
+};
+
+export type x402DelegationProvider = (
+  paymentRequirements: x402PaymentRequirements,
+) => Promise<x402DelegationPaymentPayload>;
+
+export type x402SchemeNetworkClientLike = {
+  readonly scheme: string;
+  createPaymentPayload: (
+    x402Version: number,
+    paymentRequirements: x402PaymentRequirements,
+    context?: Record<string, unknown>,
+  ) => Promise<x402PaymentPayloadResult>;
+};
+
+export type x402Erc7710ClientConfig = {
+  delegationProvider: x402DelegationProvider;
+  fallbackClient?: x402SchemeNetworkClientLike;
+};
+
+/**
+ * Normalize and validate a delegation payload before publishing it.
+ *
+ * @param payload - Delegation payload returned by the configured provider.
+ * @returns The normalized payload with checksum addresses.
+ */
+function normalizeDelegationPayload(
+  payload: x402DelegationPaymentPayload,
+): x402DelegationPaymentPayload {
+  if (!isHex(payload.permissionContext) || payload.permissionContext === '0x') {
+    throw new Error(
+      'Invalid delegation payload: permissionContext must be non-empty hex data',
+    );
+  }
+
+  return {
+    delegationManager: getAddress(payload.delegationManager),
+    permissionContext: payload.permissionContext,
+    delegator: getAddress(payload.delegator),
+  };
+}
+
+/**
+ * x402 `SchemeNetworkClient`-compatible implementation for ERC-7710 payments.
+ *
+ * This class uses structural typing and intentionally does not import x402 types,
+ * so it can be consumed without adding a direct dependency on x402 packages.
+ */
+export class x402Erc7710Client {
+  readonly scheme = 'exact';
+
+  readonly #delegationProvider: x402DelegationProvider;
+
+  readonly #fallbackClient?: x402SchemeNetworkClientLike;
+
+  constructor(config: x402Erc7710ClientConfig) {
+    this.#delegationProvider = config.delegationProvider;
+    this.#fallbackClient = config.fallbackClient;
+  }
+
+  async createPaymentPayload(
+    x402Version: number,
+    paymentRequirements: x402PaymentRequirements,
+    context?: Record<string, unknown>,
+  ): Promise<x402PaymentPayloadResult> {
+    const assetTransferMethod = paymentRequirements.extra?.assetTransferMethod;
+
+    if (assetTransferMethod !== 'erc7710') {
+      if (this.#fallbackClient) {
+        return this.#fallbackClient.createPaymentPayload(
+          x402Version,
+          paymentRequirements,
+          context,
+        );
+      }
+
+      const invalidAssetTransferMethod =
+        typeof assetTransferMethod === 'string'
+          ? `"${assetTransferMethod}"`
+          : JSON.stringify(assetTransferMethod);
+
+      throw new Error(
+        `x402Erc7710Client can only process assetTransferMethod "erc7710". Received: ${invalidAssetTransferMethod}`,
+      );
+    }
+
+    const delegation = await this.#delegationProvider(paymentRequirements);
+
+    return {
+      x402Version,
+      payload: normalizeDelegationPayload(delegation),
+    };
+  }
+}
diff --git a/packages/x402/src/x402ExactEvmErc7710ServerScheme.ts b/packages/x402/src/x402ExactEvmErc7710ServerScheme.ts
new file mode 100644
index 00000000..380ccb76
--- /dev/null
+++ b/packages/x402/src/x402ExactEvmErc7710ServerScheme.ts
@@ -0,0 +1,40 @@
+import type { Network, PaymentRequirements } from '@x402/core/types';
+import { ExactEvmScheme } from '@x402/evm/exact/server';
+
+import { x402Erc7710Server } from './x402Server';
+
+/**
+ * Exact EVM server scheme that injects ERC-7710 payment requirement fields.
+ */
+export class x402ExactEvmErc7710ServerScheme extends ExactEvmScheme {
+  readonly #erc7710Server = new x402Erc7710Server();
+
+  async enhancePaymentRequirements(
+    paymentRequirements: PaymentRequirements,
+    supportedKind: {
+      x402Version: number;
+      scheme: string;
+      network: Network;
+      extra?: Record<string, unknown>;
+    },
+    facilitatorExtensions: string[],
+  ): Promise<PaymentRequirements> {
+    const baseRequirements = await super.enhancePaymentRequirements(
+      paymentRequirements,
+      supportedKind,
+      facilitatorExtensions,
+    );
+
+    if (baseRequirements.extra?.assetTransferMethod !== 'erc7710') {
+      return baseRequirements;
+    }
+
+    const enhancedRequirements =
+      await this.#erc7710Server.enhancePaymentRequirements(
+        baseRequirements,
+        supportedKind,
+      );
+
+    return enhancedRequirements as PaymentRequirements;
+  }
+}
diff --git a/packages/x402/src/x402Server.ts b/packages/x402/src/x402Server.ts
new file mode 100644
index 00000000..784958a7
--- /dev/null
+++ b/packages/x402/src/x402Server.ts
@@ -0,0 +1,109 @@
+import { type Address, getAddress } from 'viem';
+
+import type { x402PaymentRequirements } from './x402Client';
+
+export type x402Erc7710ServerConfig = {
+  allowAssetTransferMethodOverride?: boolean;
+};
+
+/**
+ * Validate and normalize optional facilitator address metadata.
+ *
+ * @param publishedAddresses - Optional facilitator address list from `supportedKind.extra`.
+ * @returns A normalized checksum address list, or `undefined` when no list is provided.
+ */
+function validateFacilitatorAddresses(
+  publishedAddresses: unknown,
+): Address[] | undefined {
+  if (publishedAddresses === undefined) {
+    return undefined;
+  }
+
+  if (!Array.isArray(publishedAddresses)) {
+    throw new Error(
+      'Invalid facilitatorAddresses specified: expected an array of addresses',
+    );
+  }
+
+  if (publishedAddresses.length === 0) {
+    throw new Error(
+      'Invalid facilitatorAddresses specified: expected at least one address',
+    );
+  }
+
+  const normalizedAddresses: Address[] = [];
+  const validationErrors: string[] = [];
+
+  publishedAddresses.forEach((address, index) => {
+    if (typeof address !== 'string') {
+      validationErrors.push(`facilitatorAddresses[${index}] must be a string`);
+      return;
+    }
+
+    try {
+      normalizedAddresses.push(getAddress(address));
+    } catch {
+      validationErrors.push(
+        `facilitatorAddresses[${index}] is not a valid address: "${address}"`,
+      );
+    }
+  });
+
+  if (validationErrors.length > 0) {
+    throw new Error(
+      `Invalid facilitatorAddresses specified: ${validationErrors.join('; ')}`,
+    );
+  }
+
+  return normalizedAddresses;
+}
+
+/**
+ * x402 `SchemeNetworkServer`-compatible implementation for publishing
+ * `assetTransferMethod: "erc7710"` in payment requirements.
+ *
+ * This class uses structural typing and intentionally does not import x402 types,
+ * so it can be consumed without adding a direct dependency on x402 packages.
+ */
+export class x402Erc7710Server {
+  readonly scheme = 'exact';
+
+  readonly #allowAssetTransferMethodOverride: boolean;
+
+  constructor(config?: x402Erc7710ServerConfig) {
+    this.#allowAssetTransferMethodOverride =
+      config?.allowAssetTransferMethodOverride ?? false;
+  }
+
+  async enhancePaymentRequirements(
+    paymentRequirements: x402PaymentRequirements,
+    supportedKind: {
+      extra?: Record<string, unknown>;
+    },
+  ): Promise<x402PaymentRequirements> {
+    const existingMethod = paymentRequirements.extra?.assetTransferMethod;
+
+    if (
+      typeof existingMethod === 'string' &&
+      existingMethod !== 'erc7710' &&
+      !this.#allowAssetTransferMethodOverride
+    ) {
+      throw new Error(
+        `Cannot overwrite existing assetTransferMethod "${existingMethod}" with "erc7710"`,
+      );
+    }
+
+    const facilitatorAddresses = validateFacilitatorAddresses(
+      supportedKind.extra?.facilitatorAddresses,
+    );
+
+    return {
+      ...paymentRequirements,
+      extra: {
+        ...(paymentRequirements.extra ?? {}),
+        ...(facilitatorAddresses ? { facilitatorAddresses } : {}),
+        assetTransferMethod: 'erc7710',
+      },
+    };
+  }
+}
diff --git a/packages/x402/test/x402Client.test.ts b/packages/x402/test/x402Client.test.ts
new file mode 100644
index 00000000..f9e50b0c
--- /dev/null
+++ b/packages/x402/test/x402Client.test.ts
@@ -0,0 +1,136 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import type { x402PaymentRequirements } from '../src/x402Client';
+import { x402Erc7710Client } from '../src/x402Client';
+
+const baseRequirements: x402PaymentRequirements = {
+  scheme: 'exact',
+  network: 'eip155:8453',
+  asset: '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913',
+  amount: '1000',
+  payTo: '0x1111111111111111111111111111111111111111',
+  maxTimeoutSeconds: 300,
+  extra: {
+    assetTransferMethod: 'erc7710',
+  },
+};
+
+describe('x402Erc7710Client', () => {
+  it('exposes the exact scheme identifier', () => {
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn(),
+    });
+
+    expect(client.scheme).toBe('exact');
+  });
+
+  it('creates an ERC-7710 payload and normalizes addresses', async () => {
+    const delegationProvider = vi.fn().mockResolvedValue({
+      delegationManager: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+      permissionContext: '0x1234',
+      delegator: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+    });
+    const client = new x402Erc7710Client({ delegationProvider });
+
+    const payload = await client.createPaymentPayload(2, baseRequirements);
+
+    expect(delegationProvider).toHaveBeenCalledWith(baseRequirements);
+    expect(payload).toEqual({
+      x402Version: 2,
+      payload: {
+        delegationManager: '0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa',
+        permissionContext: '0x1234',
+        delegator: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
+      },
+    });
+  });
+
+  it('throws when permissionContext is empty hex', async () => {
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn().mockResolvedValue({
+        delegationManager: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+        permissionContext: '0x',
+        delegator: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+      }),
+    });
+
+    await expect(
+      client.createPaymentPayload(2, baseRequirements),
+    ).rejects.toThrow(
+      'Invalid delegation payload: permissionContext must be non-empty hex data',
+    );
+  });
+
+  it('throws when permissionContext is not hex', async () => {
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn().mockResolvedValue({
+        delegationManager: '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+        permissionContext: 'not-hex',
+        delegator: '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+      }),
+    });
+
+    await expect(
+      client.createPaymentPayload(2, baseRequirements),
+    ).rejects.toThrow(
+      'Invalid delegation payload: permissionContext must be non-empty hex data',
+    );
+  });
+
+  it('delegates to fallback client for non-erc7710 methods', async () => {
+    const fallbackResult = {
+      x402Version: 2,
+      payload: { kind: 'fallback' },
+    };
+    const fallbackClient = {
+      scheme: 'exact',
+      createPaymentPayload: vi.fn().mockResolvedValue(fallbackResult),
+    };
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn(),
+      fallbackClient,
+    });
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: { assetTransferMethod: 'eip3009' },
+    };
+    const context = { marker: 'ctx' };
+
+    const result = await client.createPaymentPayload(2, requirements, context);
+
+    expect(fallbackClient.createPaymentPayload).toHaveBeenCalledWith(
+      2,
+      requirements,
+      context,
+    );
+    expect(result).toEqual(fallbackResult);
+  });
+
+  it('throws for non-erc7710 methods without fallback', async () => {
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn(),
+    });
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: { assetTransferMethod: 'eip3009' },
+    };
+
+    await expect(client.createPaymentPayload(2, requirements)).rejects.toThrow(
+      'x402Erc7710Client can only process assetTransferMethod "erc7710". Received: "eip3009"',
+    );
+  });
+
+  it('throws with undefined method when extra is missing', async () => {
+    const client = new x402Erc7710Client({
+      delegationProvider: vi.fn(),
+    });
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: undefined,
+    };
+
+    await expect(client.createPaymentPayload(2, requirements)).rejects.toThrow(
+      'x402Erc7710Client can only process assetTransferMethod "erc7710". Received: undefined',
+    );
+  });
+});
diff --git a/packages/x402/test/x402ExactEvmErc7710ServerScheme.test.ts b/packages/x402/test/x402ExactEvmErc7710ServerScheme.test.ts
new file mode 100644
index 00000000..2a4721fb
--- /dev/null
+++ b/packages/x402/test/x402ExactEvmErc7710ServerScheme.test.ts
@@ -0,0 +1,96 @@
+import type { PaymentRequirements } from '@x402/core/types';
+import { ExactEvmScheme } from '@x402/evm/exact/server';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { x402ExactEvmErc7710ServerScheme } from '../src/x402ExactEvmErc7710ServerScheme';
+import { x402Erc7710Server } from '../src/x402Server';
+
+describe('x402ExactEvmErc7710ServerScheme', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('returns base requirements unchanged for non-erc7710 methods', async () => {
+    const baseRequirements = {
+      scheme: 'exact',
+      network: 'eip155:8453',
+      asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
+      amount: '1000',
+      payTo: '0x1111111111111111111111111111111111111111',
+      maxTimeoutSeconds: 300,
+      extra: { assetTransferMethod: 'eip3009' },
+    } as unknown as PaymentRequirements;
+    const superSpy = vi
+      .spyOn(ExactEvmScheme.prototype, 'enhancePaymentRequirements')
+      .mockResolvedValue(baseRequirements);
+    const erc7710Spy = vi.spyOn(
+      x402Erc7710Server.prototype,
+      'enhancePaymentRequirements',
+    );
+    const scheme = new x402ExactEvmErc7710ServerScheme();
+    const supportedKind = {
+      x402Version: 2,
+      scheme: 'exact',
+      network: 'eip155:8453' as const,
+    };
+    const facilitatorExtensions = ['extension'];
+
+    const result = await scheme.enhancePaymentRequirements(
+      baseRequirements,
+      supportedKind,
+      facilitatorExtensions,
+    );
+
+    expect(superSpy).toHaveBeenCalledWith(
+      baseRequirements,
+      supportedKind,
+      facilitatorExtensions,
+    );
+    expect(erc7710Spy).not.toHaveBeenCalled();
+    expect(result).toBe(baseRequirements);
+  });
+
+  it('enhances requirements for erc7710 methods', async () => {
+    const baseRequirements = {
+      scheme: 'exact',
+      network: 'eip155:8453',
+      asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
+      amount: '1000',
+      payTo: '0x1111111111111111111111111111111111111111',
+      maxTimeoutSeconds: 300,
+      extra: { assetTransferMethod: 'erc7710' },
+    } as unknown as PaymentRequirements;
+    const enhancedRequirements = {
+      ...baseRequirements,
+      extra: {
+        ...baseRequirements.extra,
+        facilitatorAddresses: ['0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa'],
+      },
+    } as unknown as PaymentRequirements;
+    vi.spyOn(
+      ExactEvmScheme.prototype,
+      'enhancePaymentRequirements',
+    ).mockResolvedValue(baseRequirements);
+    const erc7710Spy = vi
+      .spyOn(x402Erc7710Server.prototype, 'enhancePaymentRequirements')
+      .mockResolvedValue(enhancedRequirements);
+    const scheme = new x402ExactEvmErc7710ServerScheme();
+    const supportedKind = {
+      x402Version: 2,
+      scheme: 'exact',
+      network: 'eip155:8453' as const,
+      extra: {
+        facilitatorAddresses: ['0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'],
+      },
+    };
+
+    const result = await scheme.enhancePaymentRequirements(
+      baseRequirements,
+      supportedKind,
+      [],
+    );
+
+    expect(erc7710Spy).toHaveBeenCalledWith(baseRequirements, supportedKind);
+    expect(result).toEqual(enhancedRequirements);
+  });
+});
diff --git a/packages/x402/test/x402Server.test.ts b/packages/x402/test/x402Server.test.ts
new file mode 100644
index 00000000..1946817d
--- /dev/null
+++ b/packages/x402/test/x402Server.test.ts
@@ -0,0 +1,159 @@
+import { describe, expect, it } from 'vitest';
+
+import type { x402PaymentRequirements } from '../src/x402Client';
+import { x402Erc7710Server } from '../src/x402Server';
+
+const baseRequirements: x402PaymentRequirements = {
+  scheme: 'exact',
+  network: 'eip155:8453',
+  asset: '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913',
+  amount: '1000',
+  payTo: '0x1111111111111111111111111111111111111111',
+  maxTimeoutSeconds: 300,
+  extra: {},
+};
+
+describe('x402Erc7710Server', () => {
+  it('exposes the exact scheme identifier', () => {
+    const server = new x402Erc7710Server();
+
+    expect(server.scheme).toBe('exact');
+  });
+
+  it('sets assetTransferMethod to erc7710', async () => {
+    const server = new x402Erc7710Server();
+
+    const result = await server.enhancePaymentRequirements(
+      baseRequirements,
+      {},
+    );
+
+    expect(result.extra?.assetTransferMethod).toBe('erc7710');
+  });
+
+  it('handles payment requirements with no extra', async () => {
+    const server = new x402Erc7710Server();
+    const requirementsWithoutExtra: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: undefined,
+    };
+
+    const result = await server.enhancePaymentRequirements(
+      requirementsWithoutExtra,
+      {},
+    );
+
+    expect(result.extra).toEqual({
+      assetTransferMethod: 'erc7710',
+    });
+  });
+
+  it('preserves existing extra fields', async () => {
+    const server = new x402Erc7710Server();
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: { existing: 'value' },
+    };
+
+    const result = await server.enhancePaymentRequirements(requirements, {});
+
+    expect(result.extra).toMatchObject({
+      existing: 'value',
+      assetTransferMethod: 'erc7710',
+    });
+  });
+
+  it('throws when overwriting a different method is not allowed', async () => {
+    const server = new x402Erc7710Server();
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: { assetTransferMethod: 'eip3009' },
+    };
+
+    await expect(
+      server.enhancePaymentRequirements(requirements, {}),
+    ).rejects.toThrow(
+      'Cannot overwrite existing assetTransferMethod "eip3009" with "erc7710"',
+    );
+  });
+
+  it('allows overwriting when configured', async () => {
+    const server = new x402Erc7710Server({
+      allowAssetTransferMethodOverride: true,
+    });
+    const requirements: x402PaymentRequirements = {
+      ...baseRequirements,
+      extra: { assetTransferMethod: 'eip3009' },
+    };
+
+    const result = await server.enhancePaymentRequirements(requirements, {});
+
+    expect(result.extra?.assetTransferMethod).toBe('erc7710');
+  });
+
+  it('does not set facilitatorAddresses when field is missing', async () => {
+    const server = new x402Erc7710Server();
+
+    const result = await server.enhancePaymentRequirements(baseRequirements, {
+      extra: {},
+    });
+
+    expect(result.extra?.facilitatorAddresses).toBeUndefined();
+  });
+
+  it('normalizes and sets facilitatorAddresses when valid', async () => {
+    const server = new x402Erc7710Server();
+
+    const result = await server.enhancePaymentRequirements(baseRequirements, {
+      extra: {
+        facilitatorAddresses: [
+          '0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
+          '0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',
+        ],
+      },
+    });
+
+    expect(result.extra?.facilitatorAddresses).toEqual([
+      '0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa',
+      '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
+    ]);
+  });
+
+  it('throws when facilitatorAddresses is not an array', async () => {
+    const server = new x402Erc7710Server();
+
+    await expect(
+      server.enhancePaymentRequirements(baseRequirements, {
+        extra: { facilitatorAddresses: 'not-array' },
+      }),
+    ).rejects.toThrow(
+      'Invalid facilitatorAddresses specified: expected an array of addresses',
+    );
+  });
+
+  it('throws when facilitatorAddresses is empty', async () => {
+    const server = new x402Erc7710Server();
+
+    await expect(
+      server.enhancePaymentRequirements(baseRequirements, {
+        extra: { facilitatorAddresses: [] },
+      }),
+    ).rejects.toThrow(
+      'Invalid facilitatorAddresses specified: expected at least one address',
+    );
+  });
+
+  it('throws detailed errors for invalid facilitatorAddresses values', async () => {
+    const server = new x402Erc7710Server();
+
+    await expect(
+      server.enhancePaymentRequirements(baseRequirements, {
+        extra: {
+          facilitatorAddresses: [123, 'not-an-address'],
+        },
+      }),
+    ).rejects.toThrow(
+      'Invalid facilitatorAddresses specified: facilitatorAddresses[0] must be a string; facilitatorAddresses[1] is not a valid address: "not-an-address"',
+    );
+  });
+});
diff --git a/packages/x402/tsconfig.json b/packages/x402/tsconfig.json
new file mode 100644
index 00000000..946266aa
--- /dev/null
+++ b/packages/x402/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../shared/config/base.tsconfig.json",
+  "exclude": ["./node_modules/**/*", "./dist/**/*"],
+  "compilerOptions": {
+    "baseUrl": ".",
+    "outDir": "dist"
+  }
+}
diff --git a/packages/x402/tsup.config.ts b/packages/x402/tsup.config.ts
new file mode 100644
index 00000000..d1d31001
--- /dev/null
+++ b/packages/x402/tsup.config.ts
@@ -0,0 +1,12 @@
+import type { Options } from 'tsup';
+import config from '../../shared/config/base.tsup.config';
+
+const options: Options = {
+  ...config,
+  entry: ['src/index.ts'],
+  dts: {
+    entry: ['src/index.ts'],
+  },
+};
+
+export default options;
diff --git a/yarn.lock b/yarn.lock
index 0cb7bfef..fe1b270b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -857,6 +857,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@metamask/x402@workspace:packages/x402":
+  version: 0.0.0-use.local
+  resolution: "@metamask/x402@workspace:packages/x402"
+  dependencies:
+    "@metamask/auto-changelog": "npm:^5.0.2"
+    "@x402/core": "npm:^2.12.0"
+    "@x402/evm": "npm:^2.12.0"
+    eslint: "npm:^9.39.2"
+    prettier: "npm:^3.5.3"
+    tsup: "npm:^8.5.0"
+    typescript: "npm:5.5.4"
+    viem: "npm:2.31.4"
+    vitest: "npm:^3.2.4"
+  peerDependencies:
+    "@x402/core": ^2.12.0
+    "@x402/evm": ^2.12.0
+    viem: ^2.31.4
+  languageName: unknown
+  linkType: soft
+
 "@mswjs/interceptors@npm:^0.41.0":
   version: 0.41.3
   resolution: "@mswjs/interceptors@npm:0.41.3"
@@ -898,6 +918,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@noble/curves@npm:1.9.1":
+  version: 1.9.1
+  resolution: "@noble/curves@npm:1.9.1"
+  dependencies:
+    "@noble/hashes": "npm:1.8.0"
+  checksum: 10/5c82ec828ca4a4218b1666ba0ddffde17afd224d0bd5e07b64c2a0c83a3362483387f55c11cfd8db0fc046605394fe4e2c67fe024628a713e864acb541a7d2bb
+  languageName: node
+  linkType: hard
+
 "@noble/curves@npm:1.9.2":
   version: 1.9.2
   resolution: "@noble/curves@npm:1.9.2"
@@ -2007,6 +2036,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@x402/core@npm:^2.12.0, @x402/core@npm:~2.12.0":
+  version: 2.12.0
+  resolution: "@x402/core@npm:2.12.0"
+  dependencies:
+    zod: "npm:^3.24.2"
+  checksum: 10/d9ba28deb5462bac2f60d2764b3973ac0bd3e905100b06c293cedc900802c9e1557d7ef59b0515fa82d3534e1c20099737386906432f7e8768abe6e7200398ee
+  languageName: node
+  linkType: hard
+
+"@x402/evm@npm:^2.12.0":
+  version: 2.12.0
+  resolution: "@x402/evm@npm:2.12.0"
+  dependencies:
+    "@x402/core": "npm:~2.12.0"
+    viem: "npm:^2.48.11"
+    zod: "npm:^3.24.2"
+  checksum: 10/8832647ac6f634a07093dd3df99338bffbd9694c8ae6e605e442ad9737155ca136d791e5259f5a7abf26ddc105c325f009b6862d991d9af60dab750d7f4d38c3
+  languageName: node
+  linkType: hard
+
 "@yarnpkg/types@npm:^4.0.1":
   version: 4.0.1
   resolution: "@yarnpkg/types@npm:4.0.1"
@@ -2038,7 +2087,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"abitype@npm:^1.0.2, abitype@npm:^1.0.8":
+"abitype@npm:1.2.3, abitype@npm:^1.0.2, abitype@npm:^1.0.8":
   version: 1.2.3
   resolution: "abitype@npm:1.2.3"
   peerDependencies:
@@ -2053,6 +2102,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"abitype@npm:^1.2.3":
+  version: 1.2.4
+  resolution: "abitype@npm:1.2.4"
+  peerDependencies:
+    typescript: ">=5.0.4"
+    zod: ^3.22.0 || ^4.0.0
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+    zod:
+      optional: true
+  checksum: 10/500b317a53b34cb6ffe3e4f090e135972b43cd2fbdfebe64fc497dfd8515d9117919e5f88f0aaede332d29a21c1826be64a3ffa620b0b91c16e8b560b6635714
+  languageName: node
+  linkType: hard
+
 "accepts@npm:~1.3.8":
   version: 1.3.8
   resolution: "accepts@npm:1.3.8"
@@ -4957,6 +5021,27 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ox@npm:0.14.20":
+  version: 0.14.20
+  resolution: "ox@npm:0.14.20"
+  dependencies:
+    "@adraffy/ens-normalize": "npm:^1.11.0"
+    "@noble/ciphers": "npm:^1.3.0"
+    "@noble/curves": "npm:1.9.1"
+    "@noble/hashes": "npm:^1.8.0"
+    "@scure/bip32": "npm:^1.7.0"
+    "@scure/bip39": "npm:^1.6.0"
+    abitype: "npm:^1.2.3"
+    eventemitter3: "npm:5.0.1"
+  peerDependencies:
+    typescript: ">=5.4.0"
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+  checksum: 10/96526073193f3a6dd2ccd21bcc255e82c7226d6de63fa17a2021c75232fdc9bc969e75e2cbc0c8d5163d88c575e08dc4c75dec7333b1727f080585f07fc6c1ed
+  languageName: node
+  linkType: hard
+
 "ox@npm:0.8.1":
   version: 0.8.1
   resolution: "ox@npm:0.8.1"
@@ -6582,6 +6667,27 @@ __metadata:
   languageName: node
   linkType: hard
 
+"viem@npm:^2.48.11":
+  version: 2.49.2
+  resolution: "viem@npm:2.49.2"
+  dependencies:
+    "@noble/curves": "npm:1.9.1"
+    "@noble/hashes": "npm:1.8.0"
+    "@scure/bip32": "npm:1.7.0"
+    "@scure/bip39": "npm:1.6.0"
+    abitype: "npm:1.2.3"
+    isows: "npm:1.0.7"
+    ox: "npm:0.14.20"
+    ws: "npm:8.18.3"
+  peerDependencies:
+    typescript: ">=5.0.4"
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+  checksum: 10/c3a89196c422932c1c0d0071e7ff231fcaa8518d8ae2c8462b15384efa9ad8632797b09e0a164ec83aac909532647086a505fb01a78ace2a001edc5b35ff4ce9
+  languageName: node
+  linkType: hard
+
 "vite-node@npm:3.2.4":
   version: 3.2.4
   resolution: "vite-node@npm:3.2.4"
@@ -6832,6 +6938,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"ws@npm:8.18.3":
+  version: 8.18.3
+  resolution: "ws@npm:8.18.3"
+  peerDependencies:
+    bufferutil: ^4.0.1
+    utf-8-validate: ">=5.0.2"
+  peerDependenciesMeta:
+    bufferutil:
+      optional: true
+    utf-8-validate:
+      optional: true
+  checksum: 10/725964438d752f0ab0de582cd48d6eeada58d1511c3f613485b5598a83680bedac6187c765b0fe082e2d8cc4341fc57707c813ae780feee82d0c5efe6a4c61b6
+  languageName: node
+  linkType: hard
+
 "y18n@npm:^5.0.5":
   version: 5.0.8
   resolution: "y18n@npm:5.0.8"
@@ -6890,3 +7011,10 @@ __metadata:
   checksum: 10/f77b3d8d00310def622123df93d4ee654fc6a0096182af8bd60679ddcdfb3474c56c6c7190817c84a2785648cdee9d721c0154eb45698c62176c322fb46fc700
   languageName: node
   linkType: hard
+
+"zod@npm:^3.24.2":
+  version: 3.25.76
+  resolution: "zod@npm:3.25.76"
+  checksum: 10/f0c963ec40cd96858451d1690404d603d36507c1fc9682f2dae59ab38b578687d542708a7fdbf645f77926f78c9ed558f57c3d3aa226c285f798df0c4da16995
+  languageName: node
+  linkType: hard