Give every payment a reason.
Use Sonar before an agent signs an x402 payment. Get a provider recommendation, compare alternatives, and block routes with stale or insufficient evidence.
Recommend
Search by capability, preference, network, and budget. Results include score, confidence, measured success, latency, price drift, and expected successful cost.
Preflight
Send an endpoint to the preflight API with a maximum expected cost and minimum confidence. Receive an allow, warn, or block decision before payment.
Audit
Store the returned receipt ID with your agent run. Retrieve the evidence snapshot later to explain why the route was selected.
Stay informed
Query incidents and re-check evidence when a provider degrades, changes price, or stops returning valid results.
Sonar advises.
Your wallet stays yours.
Sonar does not hold payment keys, create payment signatures, proxy provider requests, or settle transactions. It supplies the evidence and policy decision; your agent remains responsible for execution.
POST /api/v2/preflight — { endpoint_id, max_expected_cost_usd, min_confidence }