# PQ Attest

> Attest a confirmed transaction from a supported chain. The attestation is recorded on Algorand MainNet and returned as an ML-DSA-65 proof bundle. POST /attest is paid with x402.

## Paid endpoints
- [Attest](https://api.pqattest.com/attest): POST { "txid": "<id>", "chain": "<network>" }. 0.001 USDC. Pay to YL63PQ3U4SHJXPBXJZJPNWKLUZ2DYQSJZ36OLWXGF7FOHWPYN4BELUOUPM.
- [Attest a block](https://api.pqattest.com/attest-block): POST { "chain": "<network>", "height": <block number> }. 0.001 USDC. One block per request.
- [Prove inclusion](https://api.pqattest.com/prove-tx-inclusion): POST { "chain": "<network>", "txId": "<id>", "height": <optional> }. 0.001 USDC.

## Free endpoints
- POST https://api.pqattest.com/verify
- POST https://api.pqattest.com/verify-block
- POST https://api.pqattest.com/verify-tx-inclusion
- GET https://api.pqattest.com/block-capabilities
- GET https://api.pqattest.com/discovery
- GET https://api.pqattest.com/openapi.json

## Paying
- Protocol: x402 (v2), settled by https://facilitator.goplausible.xyz
- Network: Algorand MainNet. Asset: USDC (31566704). Amount: 1000 micro-USDC.
- Base USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to 0x930c40fd6eb213152d7475460c29cd56d8d122cf. Amount: 1000 micro-USDC.
- Solana USDC (EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v) to 4QbPizw4V3eM1TVtXWh4yBSowqBVPq4pqYx3GrHwoCsL. Amount: 1000 micro-USDC.
- On HTTP 402, read PAYMENT-REQUIRED, sign one advertised option, and retry with PAYMENT-SIGNATURE.

## Docs
- [x402 manifest](https://api.pqattest.com/.well-known/x402.json)
- [OpenAPI](https://api.pqattest.com/openapi.json)
- [MCP](https://mcp.pqattest.com/mcp)