Routing Number Lookup API

Overview

To use Routing Number Lookup, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

https://api.apiverve.com/v1/routinglookup

Example

How to call the Routing Number Lookup API in different programming languages.

curl -X GET \
  "https://api.apiverve.com/v1/routinglookup?routing=121000358" \
  -H "X-API-Key: your_api_key_here"

const response = await fetch('https://api.apiverve.com/v1/routinglookup?routing=121000358', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/routinglookup?routing=121000358', headers=headers)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/routinglookup?routing=121000358", nil)

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "status": "ok",
  "error": null,
  "data": {
    "routing_number": "121000358",
    "office_code": "O",
    "record_type_code": "1",
    "new_routing_number": "000000000",
    "bank": "BANK OF AMERICA, N.A.",
    "address": "8001 VILLA PARK DRIVE",
    "city": "HENRICO",
    "state": "VA",
    "zip": "23228",
    "zip_extension": "0000",
    "country": "US"
  }
}

Authentication

The Routing Number Lookup API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Routing Number Lookup API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Routing Number Lookup API:

Response

The Routing Number Lookup API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <routing_number>121000358</routing_number>
    <office_code>O</office_code>
    <record_type_code>1</record_type_code>
    <new_routing_number>000000000</new_routing_number>
    <bank>BANK OF AMERICA, N.A.</bank>
    <address>8001 VILLA PARK DRIVE</address>
    <city>HENRICO</city>
    <state>VA</state>
    <zip>23228</zip>
    <zip_extension>0000</zip_extension>
    <country>US</country>
  </data>
</response>

status: ok
error: null
data:
  routing_number: '121000358'
  office_code: O
  record_type_code: '1'
  new_routing_number: '000000000'
  bank: BANK OF AMERICA, N.A.
  address: 8001 VILLA PARK DRIVE
  city: HENRICO
  state: VA
  zip: '23228'
  zip_extension: '0000'
  country: US

Response Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access Routing Number Lookup through GraphQL to combine it with other API calls in a single request. Query only the routing number lookup data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  routinglookup(
    input: {
      routing: "121000358"
    }
  ) {
    routing_number
    office_code
    record_type_code
    new_routing_number
    bank
    address
    city
    state
    zip
    zip_extension
    country
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Routing Number Lookup API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

Routing Number Lookup requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The Routing Number Lookup API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for Routing Number Lookup

Official Routing Number Lookup packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

Routing Number Lookup works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

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