Changelog State API — x402-Paid Release & Breaking-Change Tracking for Agents

https://changelog-state-api.replit.app/api/monitors/%7Bslug%7D

● healthy utility

Changelog State API watches release notes and changelogs for 40 monitored vendors and projects, including Anthropic, OpenAI, Stripe, GitHub, Chrome and more, and detects breaking changes as they ship. Free coarse fleet status; structured release and change history are paid per call over x402 (USDC on Base). OpenAPI spec at /openapi.json, agent guide at /llms.txt.

Quality grade

How grading works

B 74.2 / 100

Availability 40.0 / 40

Endpoint responded (HTTP 402)

Payability 20.0 / 20

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 14.2 / 40

4 distinct payers, 252 USDC transfers in the last 30 days

Owner verified 0.0 / 3

Nobody has claimed this listing yet

Endpoint last checked 6 h ago. On-chain activity last read 11 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass.

Paid endpoints

5 resource(s) advertised by this origin.

https://changelog-state-api.replit.app/api/healthz

https://changelog-state-api.replit.app/api/monitors

https://changelog-state-api.replit.app/api/monitors/%7Bslug%7D

https://changelog-state-api.replit.app/api/monitors/%7Bslug%7D/changes

https://changelog-state-api.replit.app/api/site/changelog/%7Bslug%7D

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -X POST https://changelog-state-api.replit.app/api/healthz

/.well-known/x402.json

https://changelog-state-api.replit.app/.well-known/x402

Listed in

Directories this entry was found in.

a2a x402scan