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keystone-opportunity-api.keystone-opportunity.workers.dev x402 conformance
https://keystone-opportunity-api.keystone-opportunity.workers.dev/v1/x402/conformance
answers 402
Probe an x402 URL without paying it: validate the live HTTP 402 challenge, v2 payment schema, Base USDC amount, payTo/network fields, and OpenAPI-to-live price consistency.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0xD3faD775704a0Ed209315A406c3D99ED589ee723
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 8196 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-15T14:25:31.181Z (23h ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fkeystone-opportunity-api.keystone-opportunity.workers.dev%2Fv1%2Fx402%2Fconformance"