{"x402Version":2,"name":"Identifier Validator API","description":"Offline validation of IBAN, BIC/SWIFT, EU VAT, card numbers, ISBN and GTIN/EAN/UPC, plus a live stablecoin peg-health verdict (DefiLlama-derived). Pay per call in USDC on Base - no API key.","network":"eip155:8453","asset":"USDC","payTo":"0x664fc5c37c86F4A541473B759EA02AF3dA8194e8","facilitator":"https://facilitator.payai.network","openapi":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/openapi.json","resources":[{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/iban?iban=DE89370400440532013000","price":"$0.002","description":"Validate an IBAN (country rules, length, BBAN structure, mod-97) - returns validity, country, SEPA flag, formatted IBAN"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/bic?bic=DEUTDEFF","price":"$0.002","description":"Validate a BIC/SWIFT code - returns structure, country, location and branch"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/vat?vat=DE811569869","price":"$0.002","description":"Validate an EU/EEA VAT number format and checksum offline"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/card?number=4111111111111111","price":"$0.002","description":"Validate a payment card number (Luhn + network detection); returns masked output only"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/isbn?isbn=9780306406157","price":"$0.002","description":"Validate ISBN-10/13 and convert between them"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/gtin?code=4006381333931","price":"$0.002","description":"Validate GTIN-8/12/13/14 (EAN/UPC) check digit"},{"method":"GET","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/stablecoin-peg?asset=USDC&chain=Base","price":"$0.005","description":"Stablecoin peg-health verdict (PEGGED/WATCH/DEPEG_RISK/DEPEGGED) with 0-100 risk score, price deviation in bps, 1d/7d/30d supply flows and per-chain liquidity, computed live from DefiLlama. asset=USDC[&chain=Base]; up to 10 comma-separated assets per call."},{"method":"POST","url":"https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/batch","price":"$0.005","description":"Validate up to 25 mixed identifiers in one call"}]}