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apiacre.com developer x402-preflight
https://apiacre.com/v1/developer/x402-preflight
answers 402
Probe a public endpoint without paying, grade its x402 v2 challenge, check exact-host x402-list presence and traction, and optionally rank licensed market matches with buyer-concentration caveats.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.05
- Network
- base
- Pay to
- 0xa0BFa4f07281c9b248DC3AED2217836BcA24869B
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 427 ms
- Payment options
- 2 usable of 2
- Last checked
- 2026-09-06T01:12:27.459Z (34d ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapiacre.com%2Fv1%2Fdeveloper%2Fx402-preflight"