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email-preflight-api.vercel.app api x402-preflight
https://email-preflight-api.vercel.app/api/x402-preflight
no payment challenge
Pre-action check for AI agents: inspect an unfamiliar live x402 v2 challenge immediately before purchase. Verify price, network, payee, resource binding, timeout, and Bazaar metadata without paying the target or forwarding credentials. POST probes send only a fixed empty JSON object; callers cannot supply target request content.
Bazaar lists this endpoint, but when we called it we got
HTTP 400 instead of a payment challenge.- Price
- 3000 atomic
- Network
- not established
- Pay to
- -
- Spec dialect
- -
- Transport
- -
- HTTP method
- POST
- Response latency
- 237 ms
- Payment options
- 0 usable of 0
- Last checked
- 2026-08-15T14:28:43.060Z (8d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Femail-preflight-api.vercel.app%2Fapi%2Fx402-preflight"