{"slug":"mcp-onchaindiligence-com-x402-preflight-payment-a28159","title":"Evaluate a proposed payment against a structured, caller-supplied policy and opt","host":"mcp.onchaindiligence.com","method":"POST","resource":"https://mcp.onchaindiligence.com/x402/preflight-payment","category":"code","description":"Evaluate a proposed payment against a structured, caller-supplied policy and optional recipient sanctions screening, before execution. Returns ALLOW, REQUIRE_APPROVAL, or BLOCK with reasons, plus a signed OCD PREFLIGHT receipt anyone can independently verify. Policy evaluation only: OCD never holds,","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":654,"reported_calls_30d":2,"reported_payers_30d":2,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"action":{"amount":"1.00","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","kind":"PAYMENT","network":"eip155:8453","recipient":"0x000000000000000000000000000000000000dEaD","resource":"https://service.example/api","sender":null},"options":{"screen_recipient_sanctions":true},"policy":{"allowed_assets":["0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"],"allowed_networks":["eip155:8453"],"allowed_resource_origins":["https://service.example"],"expected_recipient":null,"max_amount":"5.00"},"references":{"mandate_digest":null}},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"action":{"type":"object"},"options":{"type":"object"},"policy":{"type":"object"},"references":{"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":{"properties":{"checks":{"type":"array"},"decision":{"properties":{"authorized":{"type":["boolean","null"]},"reasons":{"items":{"type":"string"},"type":"array"},"status":{"enum":["ALLOW","REQUIRE_APPROVAL","BLOCK","UNKNOWN"],"type":"string"}},"type":"object"},"receipt":{"description":"Complete onchaindiligence.public-action-receipt.v1 envelope.","type":"object"}},"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":654,"error":null}],"description_full":"Evaluate a proposed payment against a structured, caller-supplied policy and optional recipient sanctions screening, before execution. Returns ALLOW, REQUIRE_APPROVAL, or BLOCK with reasons, plus a signed OCD PREFLIGHT receipt anyone can independently verify. Policy evaluation only: OCD never holds, moves, or authorizes funds. The wallet, PayBox, or x402 client independently authorizes execution afterward; an ALLOW here does not guarantee it will proceed.","last_updated":"2026-09-17T03:33:10.697Z","schemes":["exact"]}