{"uid":"cap_w0Ip7A59DrjiM2nF9MFw8","slug":"amex-card-number-validator-luhn-network-check-6c136072","name":"Amex Card Number Validator (Luhn + Network Check)","description":"Call when an agent needs whether a number passes Luhn and matches amex. Nothing is stored. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/check-card-amex first.","url":"https://agentshelf.syntexa.ch/v1/check-card-amex?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"data":{"description":"JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN."},"value":{"type":"string","examples":["411111"],"maxLength":20000,"minLength":1,"description":"Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar."},"schema":{"description":"JSON Schema document for schema-check SKUs. Omit it on string checks."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.009","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.009/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_tMoOXWVhI-9ECv_fMByHH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.009","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates that a card number passes the Luhn algorithm and matches American Express card format, without storing any data.","exampleAgentPrompt":"Can you check if the card number 378282246310005 is a valid American Express card — run the Luhn check and confirm it matches the Amex format?","exampleUseCases":[{"title":"Checkout form card network detection","prompt":"Before we process the payment, verify that the card number 371449635398431 passes Luhn validation and is actually an American Express card, not Visa or Mastercard."},{"title":"Fraud screening pre-check","prompt":"I have a card number from a suspicious order — can you run a Luhn check on 378734493671000 and tell me if it's a structurally valid Amex card?"},{"title":"Card input validation in onboarding","prompt":"The user typed in 370000000000002 as their card number during sign-up — can you confirm it's a valid Amex number before we save it?"}],"resultDescription":"Returns whether the submitted card number passes the Luhn checksum algorithm and whether it matches American Express card number patterns (starting digits and length). No data is persisted after the check.","failureModes":["Missing or empty card number value returns validation error","Non-numeric or malformed input may return format error","Card number too long or too short may fail schema validation (maxLength 20000 chars)","Network timeout or HTTP 402 if payment not handled correctly"],"whenToPreferThis":"Use this endpoint when you specifically need to validate that a card number is both mathematically valid (Luhn) and belongs to the American Express network. Prefer the free sandbox POST /v1/sandbox/check-card-amex first for testing. Choose this over generic Luhn-only checkers when network identification (Amex specifically) is required alongside checksum validation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T06:50:22.426Z","isFirstParty":false,"canonicalSlug":"amex-card-number-validator-luhn-network-check-6c136072"}