{"slug":"402-com-tr-api-x402-b20-transfer-preflight-077c3b","title":"🆕 The per-transaction B20 rail check","host":"402.com.tr","method":"GET","resource":"https://402.com.tr/api/x402/b20-transfer-preflight","category":"market","description":"🆕 The per-transaction B20 rail check: pass token + from + to (+ optional executor) and get one GO/HOLD/STOP on whether this exact transfer clears NOW — sender policy resolved against the sender, receiver policy against the recipient, executor policy against the operator, plus live transfer-pause. Ev","price_listed":0.04,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:137","eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","pathParams":{},"queryParams":{"address":"0xb20000000000000000000186a08e781c38059eec","from":"0x973a31858f4d2125f48c880542da11a2796f12d6","to":"0xFe21a68f21d556A3C4274a44c2Fb5410c50cDa1C"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object"},"queryParams":{"properties":{"address":{"description":"B20 token address","type":"string"},"executor":{"description":"Executor (optional — transferFrom operator)","type":"string"},"from":{"description":"Sender address","type":"string"},"to":{"description":"Recipient address","type":"string"}},"required":["address","from","to"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"🆕 The per-transaction B20 rail check: pass token + from + to (+ optional executor) and get one GO/HOLD/STOP on whether this exact transfer clears NOW — sender policy resolved against the sender, receiver policy against the recipient, executor policy against the operator, plus live transfer-pause. Every other B20 tool is per-token due diligence bought once; this is the check an agent runs on every payment. No ERC-20 tool can see it.","last_updated":"2026-09-09T03:01:09.259Z","schemes":["exact"]}