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ABA Routing Number Validator
x402
ABA Routing Number Validator is a paid API for AI agents from bank-validators.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Validates a 9-digit US ABA routing number using the 3-7-1 weighted checksum and identifies the Federal Reserve district from the routing prefix.
Price / call$0.02
Success—
StatusUnknown
How this service works
Check a US ABA routing number: 3-7-1 weighted checksum and the Federal Reserve district from the prefix.
Output
Returns a verdict (valid/invalid), the weighted checksum value, the normalized routing number, the 2-digit Federal Reserve district prefix, the prefix kind, the Federal Reserve district number and city, a human-readable summary, an array of reason strings explaining the result, and optional disclaimer and degraded-service flags.
Example use cases
Pre-transfer routing number check
“Before I send this wire, can you verify that routing number 021000089 passes the ABA checksum and tell me what Federal Reserve district it's in?”
Onboarding bank account validation
“A user just entered routing number 111000025 on our payment form — can you validate it and tell me if it's a legitimate ABA number and which Fed district it maps to?”
Debugging a failed ACH payment
“We had an ACH payment reject and I think the routing number 082000073 might be wrong — can you run the 3-7-1 weighted checksum on it and tell me what's wrong?”
Technical details
Endpoint
GEThttps://bank-validators.x402tookit.com/aba-routing-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to structurally validate a US ABA routing number before initiating ACH transfers, wire payments, or direct deposit setups. It provides both checksum verification and Federal Reserve district identification in a single call. Prefer this over manual checksum logic or generic bank lookup services when you need authoritative format validation plus Fed district metadata without relying on a live bank directory.
Side effects
- Non-9-digit input returns invalid verdict with format error reason
- Routing number failing 3-7-1 checksum returns invalid verdict with checksum failure reason
- Missing required 'routing' query parameter returns an error
- Network or service unavailability may return a degraded flag with partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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