# Sycamore Agent Payment Test

> Pay-per-call diagnostic endpoint for AI agents using the x402 payment protocol.
> An agent requests /api/verify, receives HTTP 402 with payment requirements, pays
> $10 USDC (Base network, gasless EIP-3009), and receives an Ed25519-signed diagnostic
> report card verifying its full payment flow: 402 handling, payment authorization,
> facilitator verification, on-chain settlement proof, latency, and origin geography.
> No signup, no API keys. Works with any x402 client (v1 and v2 protocol supported).

## API

- [Paid endpoint](https://test.sycamore-api.com/api/verify): GET or POST, $10.00 per call, x402 protocol. Optional query param `receipt_email` for an emailed receipt.
- [OpenAPI spec](https://test.sycamore-api.com/openapi.json): machine-readable API description.
- [Receipt verification key](https://test.sycamore-api.com/pubkey): Ed25519 public key; verify the signature over the canonical (sorted-key, no-whitespace) JSON of the report minus its "signature" field.
- [Health](https://test.sycamore-api.com/healthz): liveness, no payment.

## Docs

- [Landing page](https://test.sycamore-api.com/): usage examples (curl, @x402/fetch).
- [Privacy & data retention](https://test.sycamore-api.com/privacy): what is logged; no card data exists in this flow.

## Notes

- Settlement proof (on-chain transaction hash) is returned in the base64 X-PAYMENT-RESPONSE response header, per the x402 specification.
- Payment: USDC on Base (eip155:8453 mainnet; eip155:84532 during testnet phase — check the 402 response's accepts[] for the live values).
- Operated by Sycamore, New Hartford CT, USA (https://sycamore-api.com).