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ABA Routing Number Checksum Validator
x402
ABA Routing Number Checksum Validator is a paid API for AI agents from checkdigit.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Validates a 9-digit US ABA bank routing number using the weighted (3,7,1) mod-10 checksum algorithm
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.
Output
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
Example use cases
ACH payment routing validation
“Before we process this ACH transfer, can you verify that routing number 011000138 passes the ABA checksum check?”
Bank account form validation
“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?”
Batch onboarding data quality check
“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?”
Technical details
Endpoint
POSThttps://checkdigit.openverbs.com/v1/routingWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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