the402 endpoint detail

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launchcheck-x402.fly.dev proposal-check deep

https://launchcheck-x402.fly.dev/v1/proposal-check/deep

answers 402

Deep red-team a product or technical proposal before a consequential investment. Uses a larger reasoning budget to test counter-theses, hidden dependencies, supplied economics, and decisive unknowns. Typical completion time is ~2-3 minutes. Clients should allow up to 4 minutes before timing out.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$2.00
Network
base
Pay to
0x87F929c4eCac1556a507cE6b92eF95c52B28DBa4
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
179 ms
Payment options
1 usable of 1
Last checked
2026-09-06T01:15:56.544Z (36d ago)
Category
ai-inference

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Flaunchcheck-x402.fly.dev%2Fv1%2Fproposal-check%2Fdeep"