{"slug":"api-agentmercantile-com-v1-x402-service-change-snapshot-b06863","title":"Determine whether a previously accepted x402 service payment contract is still e","host":"api.agentmercantile.com","method":"POST","resource":"https://api.agentmercantile.com/v1/x402-service-change-snapshot","category":"search","description":"Determine whether a previously accepted x402 service payment contract is still equivalent enough to proceed. Compares one live unpaid 402 challenge, using a caller-supplied GET or POST request shape, against a caller-held baseline bound to that request identity. Not uptime monitoring, a trust score,","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":230,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"method":"POST","resource_url":"https://api.agentmercantile.com/v1/url-context"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"baseline":{"description":"Optional caller-held reusable payment-contract baseline bound to this request identity.","type":"object"},"body":{"description":"Optional JSON object for POST probes only.","type":"object"},"method":{"description":"Required unpaid 402 probe method. Not inferred from discovery.","enum":["GET","POST"],"type":"string"},"resource_url":{"description":"One public HTTPS x402 resource URL on port 443.","format":"uri","type":"string"}},"required":["resource_url","method"],"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"additionalProperties":true,"properties":{"decision":{"enum":["BASELINE_CREATED","CONTINUE","REVIEW","STOP","UNKNOWN"],"type":"string"},"limitations":{"items":{"type":"string"},"type":"array"},"machine":{"enum":["VM08"],"type":"string"},"methodology_version":{"enum":["x402-service-change-snapshot-0.1.0"],"type":"string"},"status":{"enum":["OK","PARTIAL","HOLD"],"type":"string"}},"required":["status","machine","methodology_version","decision","limitations"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-24","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.01,"price_match":true,"latency_ms":230,"error":null}],"description_full":"Determine whether a previously accepted x402 service payment contract is still equivalent enough to proceed. Compares one live unpaid 402 challenge, using a caller-supplied GET or POST request shape, against a caller-held baseline bound to that request identity. Not uptime monitoring, a trust score, a webhook, a marketplace crawl, or a generic POST {} probe of every x402 resource.","last_updated":"2026-09-18T02:08:35.499Z","schemes":["exact"]}