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SCVD Good Buyer — x402 Payment Simulation & Verdict
x402
SCVD Good Buyer — x402 Payment Simulation & Verdict is a paid API for AI agents from scvd.store, paid per call via x402, $0.99/call, status unknown (last checked 2026-09-13).
Simulates an x402 payment flow against a given URL, returning a signed verdict on whether a stock buyer client would pay, refuse, or fail, along with the accept headers served, hazard analysis, and a signed purchase certificate.
Price / call$0.99
Success—
StatusUnknown
How this service works
The Good Buyer. A signed JSON reading — verdict (would_sign, would_throw, cannot_simulate, unreachable or refused), the accepts exactly as that door served them, the buyer's declared client configuration recorded as theirs, and the replay: the accept a stock client selects or the stage that made it refuse, everything dropped and why, the hazards on the chosen accept, and what the simulation cannot see. Dated, evidence hash bound into the purchase certificate's attests field,…
Output
A signed JSON object containing: a verdict string (would_sign, would_throw, cannot_simulate, unreachable, or refused), the raw accept headers as served by the target URL, the buyer's declared client configuration, a replay trace showing which accept the stock client selected or the refusal stage and reason, a list of hazards on the chosen accept, notes on what the simulation cannot observe, and a dated purchase certificate with an evidence hash in its attests field.
Example use cases
Pre-launch x402 paywall audit
“Before I go live, run the Good Buyer simulation against https://mypaidapi.com/v1/data and tell me if a stock x402 client would sign the payment, what accept headers it receives, and flag any hazards — my max spend for the test is $2.00.”
Debugging a refused x402 payment door
“My x402 endpoint at https://myservice.io/premium keeps getting skipped by buyer clients — can you simulate what a stock buyer does when it hits that URL and tell me exactly what stage it refused and why?”
Generating a signed compliance certificate
“I need a signed, hash-bound certificate proving that https://partner-api.net/feed passed a Good Buyer simulation — include my purpose 'due diligence check for integration partnership' and put 'ComplianceBot' as the agent name on the certificate.”
Technical details
Endpoint
GEThttps://scvd.store/api/buy/good_buyerWhen to prefer
Use this endpoint when you need an independent, signed third-party assessment of an x402 payment door — especially before integrating with or deploying an x402-monetized API, when debugging why buyer clients are refusing to pay, or when you need a verifiable certificate (with evidence hash) to share with partners or auditors as proof of conformance testing. Prefer this over manual inspection when you need a replay trace and hazard analysis in one signed artifact.
Side effects
- Target URL is unreachable — verdict returns 'unreachable'
- Target URL is scvd.store's own hostname — refused by policy
- x402 door returns malformed or non-standard accept headers — verdict may be 'cannot_simulate'
- Payment of $0.99 USDC fails (insufficient balance or x402 payment error) — call does not complete
- URL is not a valid HTTPS URI or uses a non-default port — input validation error
- No x402 402 response returned by target — simulation cannot proceed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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