API to Validate Routing Number 031101114

You need to check whether ABA routing number 031101114 is valid and obtain the bank details you must capture to safely initiate an ACH transfer. By the end of this guide, you will validate 031101114 via a single API call, interpret the response fields, and wire the result into your onboarding and payment flows with robust error handling and caching.

What you’re validating and why 031101114 matters

Routing numbers (ABA RTNs) identify a US financial institution for ACH and wire transactions. Validating a routing number prevents misdirected funds, reduces returns (R03/R04), and helps your support and risk teams resolve issues quickly. In this article, we focus on 031101114, returning the bank identity and branch location data needed to proceed with an ACH debit or credit.

The validation endpoint returns whether the number is active and the bank details to present to users or store alongside the mandate or disbursement record. This is critical for reconciliation and compliance checks during account verification and payout setup.

ABA routing number format and checksum at a glance

An ABA routing number is nine digits. A high-level checksum (3-7-1 weighting) helps detect typographical errors before you even call an API:

• Multiply digits 1, 4, 7 by 3; digits 2, 5, 8 by 7; digits 3, 6, 9 by 1.
• Sum the results. A valid number’s sum modulo 10 equals 0.

Always perform server-side verification with authoritative data as well. Some numbers pass the checksum but are not assigned or not active. The API below provides the authoritative status and bank identity for 031101114.

Validate 031101114 using the BankDataStack API

Use the routing validation endpoint over HTTPS with your API key. The example below validates routing number 031101114 for an ACH payment context. Keep your API key in server-side configuration, not in client-side code.

cURL example

curl -X POST "https://www.bankdatastack.com/api/v1/routing/validate" -H "X-API-Key: YOUR_API_KEY" -H "Content-Type: application/json" -d '{"routing_number":"031101114","payment_type":"ach"}'

Python example

import json
import os
import sys
import urllib.request

API_KEY = os.environ.get("BANKDATASTACK_API_KEY", "YOUR_API_KEY")
url = "https://www.bankdatastack.com/api/v1/routing/validate"
payload = {
"routing_number": "031101114",
"payment_type": "ach"
}
data = json.dumps(payload).encode("utf-8")
req = urllib.request.Request(url, data=data, method="POST")
req.add_header("X-API-Key", API_KEY)
req.add_header("Content-Type", "application/json")

try:
with urllib.request.urlopen(req, timeout=10) as resp:
body = resp.read().decode("utf-8")
result = json.loads(body)
except urllib.error.HTTPError as e:
sys.stderr.write(f"HTTP error: {e.code} {e.reason}\n")
sys.exit(1)
except Exception as e:
sys.stderr.write(f"Request failed: {e}\n")
sys.exit(1)

# Minimal validation logic
if result.get("status") == "success":
data = result.get("data", {})
routing = data.get("routingNumber")
active = data.get("active")
bank_name = data.get("name")
city = data.get("city")
state = data.get("state")
phone = data.get("phone")

# Use in ACH onboarding or payout setup
print(f"Routing {routing} validated for ACH.")
print(f"Bank: {bank_name}, {city}, {state}")
print(f"Active: {active}, Support: {phone}")
else:
sys.stderr.write("Routing validation did not succeed; do not proceed with ACH.\n")
sys.exit(1)

A realistic response for 031101114 and how to use it

Below is a sample JSON response for 031101114. Use these fields to decide if you can proceed with an ACH and to populate bank details in your UI or ledger records.

{
    "status": "success",
    "data": {
        "routingNumber": "031101114",
        "paymentType": "ach",
        "name": "Thebancorp.com Bank",
        "addressFull": "Wilmington, DE",
        "street": "SUITE 105",
        "city": "Wilmington",
        "state": "DE",
        "zip": "19809",
        "type": "Main Office",
        "phone": "866-546-9556",
        "active": true,
        "lastUpdated": "2026-11-02",
        "address": "SUITE 105"
    }
}

Field usage in your flow:

• status: Proceed only if this equals "success". Treat any other value or HTTP error as not validated.
• data.routingNumber: Echo this back in logs and audit trails for the verification attempt.
• data.paymentType: Confirms the context requested (ach). Keep this in your records if your workflow supports multiple rails.
• data.name, addressFull, street, city, state, zip: Display to the user for confirmation; store with the account’s bank metadata.
• data.type: May indicate "Main Office" vs. other office types; useful for support handoffs.
• data.phone: Provide to support or show in operations dashboards for bank-contact lookups.
• data.active: Block onboarding or payouts if false.
• data.lastUpdated: Use for caching and data freshness policies (see caching section).

Where to plug this into your ACH onboarding and payment flows

• Bank account collection (front-end): Run a client-side checksum to catch obvious typos before submit. Never expose your API key; perform authoritative validation server-side immediately after form submit and before creating a mandate or micro-deposit.
• ACH credits and debits (back-office): Validate 031101114 right before initiating a new counterparty payout or debit. If active is false or the status isn’t success, halt and alert the operator.
• Counterparty management: Store the bank identity returned for audit purposes and to reduce disputes. If your policies require the bank city/state to match user-submitted data, compare data.city and data.state and escalate mismatches.

Error handling, “not found,” and retry strategy

Treat any non-2xx HTTP response or a JSON payload where status is not "success" as a failed validation. Do not proceed with ACH in those cases. Prompt the user to re-check the digits or retry later if you suspect a transient network issue.

• Not found: If the API does not return success for 031101114, consider the routing number unverified. Ask the user to confirm the number or provide an alternate payment rail.
• Retries: Use exponential backoff for transient request failures (connection timeouts). Do not endlessly retry for user input errors.
• Idempotency: Log request payloads and responses with timestamps to avoid duplicate work in job queues.

Caching reference data safely

Routing assignment data is relatively stable, but banks can merge or change office details. To balance performance and freshness:

• Cache successful validations of 031101114 for 24 hours in your server-side cache. Use data.lastUpdated to inform refresh schedules.
• Cache negative results for a short period (e.g., 15–60 minutes) so users can correct typos without long delays.
• Invalidate cached entries when your risk or ops team flags a counterparty for re-verification, or upon repeated ACH returns.

Comparing routing numbers with other identifiers you may handle

Many fintech stacks validate multiple identifiers. The USA does not use IBAN, but you may still encounter them in international flows. Keep the responsibilities of each identifier distinct:

Security note: For cards, store only the BIN (first digits) and tokenized PANs; never store full card numbers in your logs or databases.

Security, PII, and operational safeguards

• API keys: Keep X-API-Key server-side only. Rotate regularly via your secrets manager.
• Logging: Redact full account numbers. Log the routing number, bank name, and active flag for audits.
• PII handling: Bank identity fields are not sensitive like PANs or SSNs, but still follow least-privilege access controls.
• User experience: If validation fails for 031101114, show a clear prompt to re-check the digits and optionally link to your help center explaining where to find the routing number on a check.

Testing your integration

Before hitting production flows, verify you handle both success and failure paths:

• Success path: 031101114 returns success, data.active is true, and you can proceed with ACH setup.
• Alternate known-good: Validate another well-known routing number like 021000021 to confirm consistent parsing and logging.
• Failure path: Introduce a malformed or non-existent routing number to test error handling and user messaging.

Plans, trial, and getting your API key

The Starter plan is $49.99/month with a 7-day trial so you can ship your validation flow before committing. To get an API key and start validating 031101114 and other routing numbers, visit the links below.

• Register
• Documentation

FAQ

Does the validation confirm account ownership?
No. Routing validation confirms the bank identifier and status only. Use account verification (e.g., micro-deposits or instant-account verification) for ownership.

Can I use this for wires as well as ACH?
The response identifies the bank and its status. Some institutions use the same routing number for ACH and wires, others have separate numbers. Capture the paymentType you validated against and confirm wiring instructions separately if needed.

What does “active: true” practically mean?
It indicates the routing number is currently active in reference data. You should still ensure the counterparty’s account is open and permitted for the transaction type.

How should I cache 031101114?
Cache positive validations for about a day and negative results briefly (minutes). Refresh earlier if your ops team requests a re-check or you encounter returns.

Does the USA use IBAN?
No. US domestic payments rely on routing numbers and account numbers. IBANs are used outside the US; you may still validate them for international flows.

Ready to validate 031101114 and ship your ACH onboarding flow? Grab your API key with the 7-day trial and integrate the POST /api/v1/routing/validate endpoint in minutes: Register. For more endpoint details and field definitions, see the Documentation.