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agent-proof.onrender.com preflight
https://agent-proof.onrender.com/preflight
answers 402
Use before paying an unfamiliar x402 endpoint. Checks that the target is reachable, actually speaks x402, and what its historical reliability looks like, then returns a receipt with a safe_to_use or flagged verdict.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base-sepolia
- Pay to
- 0xC7b3a251FB356ce6d002827CA2CFe5C6F6C10007
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 175 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:19:37.031Z (2h ago)
- Category
- web-scraping
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fagent-proof.onrender.com%2Fpreflight"