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launchcheck-x402.fly.dev v1 proposal-check
https://launchcheck-x402.fly.dev/v1/proposal-check
answers 402
Stress-test a product, feature, API, implementation, or business proposal before meaningful investment. ProposalCheck evaluates the core thesis, assumptions, differentiation, feasibility, economics, scope, dependencies, validation strategy, kill criteria, and recommended build sequence, then returns a structured green-light, revise, or rethink decision.
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
- 80 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-15T14:28:19.410Z (7d ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Flaunchcheck-x402.fly.dev%2Fv1%2Fproposal-check"