@tempus1/x402-attest

Drop-in attestation wrapper for x402 payment clients. Every paid call produces a tamper-evident receipt that a third party can verify without trusting the agent, the seller, or Rubric.

+ import { withAttestation } from '@tempus1/x402-attest';
+ const fetchAndPay = withAttestation(baseX402Fetch, { subjectId: 'agent-alpha' });

- const res = await baseX402Fetch(url, init);
+ const res = await fetchAndPay(url, init);

• Never blocks the request path; anchoring is async and best-effort-durable.
• Never transmits plaintext request or response bodies.
• Batched Merkle anchoring: ~$0.00002 per call at a batch size of 256.
• Failures are attested, not swallowed.
• Verification needs no API key and no cooperation from us.

Zero runtime dependencies. Node >= 20.11.

npx @tempus1/x402-attest verify ./receipt.json   # exit 0 = valid

Full documentation, a worked receipt, and an honest account of what a receipt does and does not prove: root README.

• ASSUMPTIONS.md
• DEVIATIONS.md