Epic] x402 payment rails — production

[clintjeff2]

Motivation

• Ensure x402 subscription state (plans, renewals, calls-used, grace/paused status) survives process restarts by replacing the in-memory-only registry with a durable store.
• Provide a tiny, developer-friendly SDK helper so operators can add an x402 paywall to Next.js/API routes in a few lines.

Description

• Persist subscriptions under a JSON-backed store (.data/x402-subscriptions.json) with helpers ensureSubscriptionStore, readSubscriptionStore, writeSubscriptionStore, hydrateSubscriptionRegistry, and persistSubscriptionRegistry in lib/protocols/x402.ts and wired into all subscription lifecycle paths (createX402Subscription, renewX402Subscriptions, checkX402Subscription, listX402Subscriptions, getX402SubscriptionById).
• Atomically write subscription updates and expose test helpers setX402SubscriptionStorePathForTests, resetX402SubscriptionStorePathForTests, and ensure test reset behavior via resetX402SubscriptionsForTests.
• Add a new package scaffold packages/x402 with a small TypeScript SDK and an x402Gate helper that verifies receipt headers and returns a 402 quote response when payment is required (packages/x402/src/index.ts and package.json/tsconfig.json).
• Add a persistence-focused test to lib/protocols/x402.test.ts that asserts subscriptions are written and reloaded and that consumeCall is persisted (calls used increments are durable).

Testing

• Ran npx tsc -p packages/x402/tsconfig.json which succeeded for the new SDK package.
• Ran npx vitest run lib/protocols/x402.test.ts __tests__/api/explorer/receipts.test.ts and all tests passed (Test Files 2 passed, Tests 5 passed).
• Attempted repository-level typecheck via npm run typecheck || npx tsc --noEmit but it surfaced unrelated, pre-existing repository type issues (no typecheck script and TS errors in app/api/agents/[id]/tasks/drain/route.ts, lib/wallet-config.ts, and tests/lib/agents/task-drain.test.ts), so a full repo typecheck was not completed as part of this change.

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Closes #18

[leocagli]

Hi @clintjeff2 — a heads-up on this PR (and it's the same across all 10 of your open PRs): the required "Typecheck, tests, build, and guards" check is failing, so none of them can merge. SonarCloud Code Analysis passes, so it's not a code-quality issue — it's a TypeScript / test / build error.

To reproduce and fix locally:

pnpm install
pnpm typecheck   # see the exact TS errors
pnpm build

Since it fails on all your PRs identically, the likely cause is a shared issue (a branch off an out-of-date base, or a common type/import error). Fixing that and pushing should turn them green. Happy to help pinpoint it if you paste the pnpm typecheck output. 🙏

[leocagli]

Closing as part of a security cleanup. Every one of your 9 open PRs (#354 #355 #356 #357 #359 #360 #361 #363 #364) edits lib/passport/validator-client.ts — the file that was the target of the spec-corruption attacks in #284/#358. Features like rate limiting, observability, API-key management, agent runtime, and orchestration have no legitimate reason to modify the ZK passport validator client.

Combined with (a) you being the author of the #358 attack on this exact file, and (b) recurring unrelated scope creep flagged in review (e.g. silently raising MAX_PENDING_PER_AGENT 100→500, unused EVM/MetaMask dependencies, unauthenticated endpoints), these are being closed.

If any of this work is genuine, resubmit each feature as a focused PR that does not touch anything under lib/passport/, with no unrelated changes, and green CI. They will be reviewed on their merits.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud