# x402Score

> Free, automated reputation scores for x402-paid API endpoints. Built for AI agents
> deciding whether an endpoint is worth paying before they call it.

x402Score crawls the public x402 Bazaar catalog, probes each listed endpoint on a
schedule, and computes a 0-100 score / A-F grade from how it actually behaves —
uptime, x402-envelope compliance, latency relative to similar endpoints, and price
stability — not from anything the provider self-reports. The exact formula and
weights are not published, to keep scores harder to game than a documented checklist.

## API

- [GET /leaderboard](https://x402score.agenttrust.workers.dev/leaderboard) — HTML, every scored endpoint ranked by score
- GET /score/:endpointId — JSON `{ score, grade, sampleSize, confidence, lastUpdated }`.
  `endpointId` is the first 16 hex characters of SHA-256(endpoint URL) — computable
  without a lookup.
- [GET /calibration](https://x402score.agenttrust.workers.dev/calibration) — JSON, is the scoring formula actually predictive?
- POST /submit `{ url }` — add an endpoint to be monitored (rate-limited, 5/hour/IP)
- GET /score/:endpointId/full — paid, $0.005 USDC on Base mainnet via x402, adds the
  full audit breakdown and recent raw probes

## More

- [Full docs](https://x402score.agenttrust.workers.dev/docs)
- [x402 capability manifest](https://x402score.agenttrust.workers.dev/.well-known/x402)