{"service":"Second Opinion","description":"POST /critique for a structured second-opinion review of a claim, plan, or draft output. Priced for autonomous agent callers, not humans.","price":"$0.01","network":"eip155:8453","mode":"MAINNET - real money","pay_to":"0x0b9B8a32AD1E821af6E470A4De97ba7188A130a4","manifest":"/.well-known/x402","free_sample":{"endpoint":"POST /sample (or GET /sample for a zero-argument demo)","description":"Same engine, top 2 issues only, no payment required — check output quality before you pay.","rate_limit":"20 per hour per IP"},"agent_docs":"/llms.txt","openapi":"/openapi.json","engine":"heuristic-v2"}