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Groundcheck Signed Delivery Attestation
x402
Groundcheck Signed Delivery Attestation is a paid API for AI agents from groundcheck.seiche.info, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Issues an offline-verifiable Ed25519 attestation that binds an x402 payment receipt to the delivered payload, verifying schema conformance and claim verdicts for agentic commerce accountability.
Price / call$0.05
Success—
StatusUnknown
How this service works
Signed delivery receipts for agentic commerce: submit what a paid service returned (plus its x402 settlement receipt and advertised schema) and receive an offline-verifiable Ed25519 attestation binding payment to delivery to grounded content — schema conformance, machine-verified claim verdicts, and a neutral accountability trail for disputes between agents and the services they pay.
Output
An offline-verifiable Ed25519 attestation that cryptographically binds the x402 payment receipt to the delivered response payload, including schema conformance results, machine-verified claim verdicts (up to 20), and a neutral accountability trail suitable for dispute resolution between agents and paid services.
Example use cases
Example prompt
“I just paid a financial data API via x402 and got a response — can you submit the response payload, the X-PAYMENT-RESPONSE receipt, and the service's advertised JSON schema to Groundcheck and get back a signed Ed25519 attestation confirming the delivery matches what was paid for, checking up to 10 claims?”
Technical details
Endpoint
POSThttps://groundcheck.seiche.info/attest-deliveryWhen to prefer
Use this endpoint when an AI agent has paid for a service via x402 and needs cryptographic proof that the payment, delivery, and schema conformance are all bound together — especially when dispute resolution or auditability between agents and paid services is required. Prefer this over informal logging when the agent needs an offline-verifiable, third-party attestation rather than self-reported records.
Side effects
- Invalid or malformed x402 payment receipt returns 400 with receipt parse error
- Response payload fails schema validation — attestation issued but conformance field is false
- Service URL not resolvable or not recognized — may return 422
- max_claims exceeded (>20) returns 400 validation error
- Malformed JSON in advertised_schema causes 400 schema parse error
- Payment processing failure for the $0.05 USDC fee returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| service | string | URL (or name) of the paid service whose delivery is being verified |
| max_claims | integer | |
| request_text | string | What was asked of the service (optional; bound by hash when given) |
| response_text | string | The delivered payload, verbatim (JSON or prose) |
| payment_receipt | string | x402 settlement receipt from the paid call (X-PAYMENT-RESPONSE value, base64 or JSON) |
| advertised_schema | object | JSON schema the service advertised for its output |
Tags
x402
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