{"uid":"cap_XH-fanKXoXj7IZ-oywWA7","slug":"aba-routing-number-checksum-validator-129fe232","name":"ABA Routing Number Checksum Validator","description":"Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.","url":"https://checkdigit.openverbs.com/v1/routing","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","required":["routingNumber"],"properties":{"routingNumber":{"type":"string","maxLength":32,"minLength":1,"description":"9-digit ABA routing number (spaces/hyphens allowed)."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ptB_7K1guTcxOvabcpCu9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates a 9-digit US ABA bank routing number using the weighted (3,7,1) mod-10 checksum algorithm","exampleAgentPrompt":"Can you check whether the routing number 021000021 is a valid ABA bank routing number using the weighted checksum?","exampleUseCases":[{"title":"ACH payment routing validation","prompt":"Before we process this ACH transfer, can you verify that routing number 011000138 passes the ABA checksum check?"},{"title":"Bank account form validation","prompt":"A user entered 026009593 as their bank routing number in the payment form — can you validate it with the ABA mod-10 checksum before we save it?"},{"title":"Batch onboarding data quality check","prompt":"We collected routing number 121000358 from a new vendor — can you confirm it's a valid ABA routing number before we add them to payroll?"}],"resultDescription":"A validation result indicating whether the supplied routing number passes the ABA weighted (3,7,1) mod-10 checksum, effectively confirming whether it is structurally valid as a US bank routing number","failureModes":["Routing number fails checksum — returned as invalid result, not an error","Input shorter than 9 digits after stripping spaces/hyphens — may return validation error","Input longer than 32 characters — rejected by schema","Non-numeric characters other than spaces/hyphens — likely validation failure","Network or payment failure — HTTP 402 or 5xx response"],"whenToPreferThis":"Use this endpoint when you need fast, offline-style structural validation of a US ABA routing number before submitting it to a payment system or storing it in a database. It is purpose-built for the ABA (3,7,1) weighted mod-10 algorithm, unlike generic Luhn validators on the same platform which use a different checksum scheme. Prefer it over calling a full bank lookup API when you only need to confirm the number is structurally plausible, not that the bank actually exists.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:30:26.688Z","isFirstParty":false}