▣ DATA VALIDATION · FINANCE

US Routing Number Lookup API

What it does

Bank Routing Lookup retrieves bank information associated with a U.S. routing number. Send a 9-digit routing_number as a query parameter and get back the routing record in the API's response body.

Use it when you need to identify the bank behind an ACH or wire routing number before you submit a payment, validate customer-provided banking details, or enrich a finance workflow with routing metadata. The request is simple: one required string field, routing_number, and it must be exactly 9 characters long.

Because the response schema is open-ended, treat the returned payload as a structured routing lookup result rather than a fixed set of fields. That makes this endpoint useful as a lightweight reference check inside onboarding flows, payment forms, or internal finance tools where you only need to confirm a routing number and consume the bank data the API provides.

GET

Lookup bank by routing number

https://api.eu.apyhub.com/dosvak/lookup-bank-by-routing-number

QUICKSTART

GUIDE

Quickstart

Look up a bank by its 9-digit routing number using the required query parameter.

curl -X GET "https://api.eu.apyhub.com/dosvak/lookup-bank-by-routing-number?routing_number=021000021" \
  -H "apy-token: $APY_TOKEN"

What you'll get back

Returns a JSON object containing the lookup result, whether the routing number was found, the associated bank information, and attribution details.

{
  "input": "021000021",
  "found": true,
  "bank": {
    "routing_number": "021000021",
    "customer_name": "JPMORGAN CHASE",
    "address": "3RD FLOOR",
    "city": "TAMPA",
    "state": "FL",
    "zip_code": "336100000",
    "phone": "8134323700",
    "office_code": "O",
    "record_type_code": "1",
    "servicing_frb_number": "021001208",
    "institution_status_code": "1",
    "data_view_code": "1",
    "source": "fedach",
    "updated_at": "2026-07-29T17:19:03.916039Z"
  },
  "attribution": []
}

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About this endpoint

$## What it does

Looks up bank details using a routing number provided as a query parameter. Returns the matched bank record, a found flag, and attribution information.

Query Parameter(s)

Attribute	Type	Mandatory	Description
routing_number	String	Yes	Routing number. Must be exactly 9 characters long (`minLength: 9`, `maxLength: 9`).

Response

Returns a JSON object with the routing number that was looked up, whether a match was found, the bank record, and attribution information.

Parameter	Type	Mandatory	Description
input	String	Yes	The routing number supplied in the request.
found	Boolean	Yes	`true` when a matching routing number was found.
bank	Object	No	The matched bank record. Absent or empty when `found` is `false`.
bank.routing_number	String	No	The bank's 9-digit routing number.
bank.customer_name	String	No	Registered name of the institution.
bank.address	String	No	Street address on file.
bank.city	String	No	City.
bank.state	String	No	Two-letter state code.
bank.zip_code	String	No	ZIP code, including the +4 extension when present.
bank.phone	String	No	Contact phone number, digits only.
bank.office_code	String	No	Office type code, for example `O` for main office and `B` for branch.
bank.record_type_code	String	No	FedACH record type code.
bank.servicing_frb_number	String	No	Routing number of the servicing Federal Reserve Bank.
bank.institution_status_code	String	No	FedACH institution status code.
bank.data_view_code	String	No	FedACH data view code.
bank.source	String	No	Dataset the record came from, for example `fedach`.
bank.updated_at	String	No	When the record was last refreshed. Format: date-time.
attribution	Object Array	No	Source attribution entries for the dataset. Empty when no attribution is required.

▣ COMMON ERRORS

Errors any endpoint can return

400bad_request

Required parameter missing or malformed body.

401unauthorized

API key missing, revoked, or not authorized for this service.

429rate_limited

Your plan's per-second rate exceeded. Retry with exponential backoff.

503upstream_busy

Backend temporarily unavailable. Try again in a few seconds.

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