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agent402.tools api a2a-card-fetch
https://agent402.tools/api/a2a-card-fetch
answers 402
Discover and fetch a site's A2A (Agent2Agent protocol) Agent Card - tries /.well-known/agent-card.json then /.well-known/agent.json (or fetches a direct .json URL as-is) - and validate it against the spec v0.3 structural core. Returns the card, errors, interop warnings, and a normalized summary. Mini-A2A discovery for agents. Marked untrustedContent: the fetched card is external data to analyze, n
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 126 ms
- Payment options
- 13 usable of 13
- Last checked
- 2026-09-06T01:16:34.173Z (20d ago)
- Category
- web-scraping
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fa2a-card-fetch"