# Sentinel402 — Agent Interface

Sentinel402 is an autonomous pay-per-evidence procurement service using x402 v2 on Hedera testnet.

## Discovery
GET /api/catalog
GET /openapi.json

## Paid tools
GET /api/tools/identity?account=0.0.x
GET /api/tools/flow?account=0.0.x
GET /api/tools/risk?account=0.0.x

Each paid endpoint responds with HTTP 402 and PAYMENT-REQUIRED. Register the official `@x402/hedera` exact client scheme for `hedera:*`, sign the exact HBAR transfer, then retry with PAYMENT-SIGNATURE. A successful response carries PAYMENT-RESPONSE with the Hedera testnet transaction id.

## Autonomous demo
POST /api/runs
Content-Type: application/json

{"account":"0.0.108869","depth":"deep","budgetTinybar":"1000000"}

Poll the Location response header until status is completed or failed. Never send private keys to this service.