Validate an ABA routing number

Code snippets

curl "https://api.oanor.com/routingnumber-api/v1/validate" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/routingnumber-api/v1/validate", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/routingnumber-api/v1/validate");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/routingnumber-api/v1/validate",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "ABA checksum: 3(d1+d4+d7) + 7(d2+d5+d8) + (d3+d6+d9) ≡ 0 (mod 10). The first two digits are the Federal Reserve routing symbol. 021000021 (JPMorgan Chase) is valid.",
        "valid": true,
        "inputs": {
            "number": "021000021"
        },
        "district": "Federal Reserve Bank of New York",
        "normalized": "021000021",
        "check_digit": "1",
        "institution_identifier": "0002",
        "federal_reserve_routing_symbol": "02"
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:13.376Z",
        "request_id": "3a728f78-f267-437c-bd57-d5e971adee07"
    },
    "status": "ok",
    "message": "Validate routing number",
    "success": true
}