Sign a timestamped receipt over a SHA-256 hash
attestpage_attestUse when an agent needs to show later that a file, answer or record existed unchanged at a point in time: send its sha256, and get back a signed, timestamped receipt over it; a later altered copy no longer matches. Optional note; with an idempotency_key (x402 payments only), a retry gets the same receipt and is not a new record. Costs US$0.002 per call in USDC via x402 (Base), charged only when the call succeeds; a bad request is refused unpaid. Pay by putting an x402 payment payload in _meta["x402/payment"]. Without one it uses the free trial (5 calls a day per address), then returns the payment requirements. Docs: https://vehcdj664efetfrsolne5umanq.srv.us/docs/attest
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| note | No | Optional note; only its SHA-256 goes in the receipt. | |
| sha256 | Yes | SHA-256 (hex) of the thing being attested. | |
| idempotency_key | No | Optional, x402 payments only (keys are scoped to the paying address; trial and L402 calls get 400). Retries with the same key and sha256 get the same receipt; a different sha256 gets 409. |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| tier | No | ||
| receipt | Yes | ||
| attestation | Yes |