validate
Validate a US bank ABA routing number with the Federal...
Validate a US bank ABA routing number with the Federal Reserve weighted mod-10 checksum (3-7-1) — not just a 9-digit regex. Returns {valid, routingNumber, district (routing-symbol class), reason}. Catches transposed digits in ACH/wire setup that a length check misses. Structure + checksum only; not a bank-directory existence lookup.
get/api/validate/aba
Request
- Base URL: https://2s.io
- URL: https://2s.io/api/validate/aba
- Auth: API key in header PAYMENT-SIGNATURE
Query parameters
routingNumberstring required
Routing number.
trial1
Try before you buy. Set to 1 for one free real call per endpoint per hour — no wallet or payment needed — to verify the endpoint before paying. Equivalent to sending the "X-2s-Trial: 1" request header. Listed only on operations that offer a trial; the others always answer 402.
Response
(unresolved $ref)
Changes
No recorded changes to this operation across all 1 revision of this API.