IBAN Validator

Validate IBAN numbers and extract the bank code and account number. Supports all countries in the official SWIFT IBAN Registry. Returns a structured response for both valid and invalid IBANs — the valid field tells you whether the IBAN passed checksum validation.

Get API Key

Overview

Use Cases

Payment form validation before submission
Fintech apps processing international bank transfers
Fraud detection pipelines verifying account details
Accounting software importing supplier bank details
KYC / AML workflows verifying customer bank accounts

Features

ISO 13616 checksum validation (mod-97 algorithm)

Country-specific length validation for ~80 countries

Bank code extraction (Bankleitzahl, sort code, etc.)

Account number extraction from the BBAN

Accepts IBANs with or without spaces

Case-insensitive input

Always returns 200 — the valid field signals pass/fail

API Endpoints

Validate IBAN

Validates an IBAN and returns the country, bank code, and account number. Spaces in the input are stripped automatically. Always returns HTTP 200 — check the valid field to determine whether the IBAN is valid.

GET

https://api.requiems.xyz/v1/finance/iban/{iban}

Parameters

Name	Type	Required	Description
iban	`string`	Required	The IBAN to validate. Spaces are stripped. Case-insensitive.

Try it out

Live Demo

Request

iban * (string)

The IBAN to validate. Spaces are stripped. Case-insensitive.

Response Fields

Field	Type	Description
iban	`string`	The normalised IBAN (spaces stripped, uppercased)
valid	`boolean`	true if the IBAN passed length and ISO 13616 checksum validation
country	`string`	Full country name (empty if the country code is not in the registry)
bank_code	`string`	Bank identifier extracted from the BBAN (empty if country not in registry or positions not defined)
account	`string`	Account number extracted from the BBAN (empty if country not in registry or positions not defined)

Code Examples

curl "https://api.requiems.xyz/v1/finance/iban/DE89370400440532013000" \
  -H "requiems-api-key: YOUR_API_KEY"

# With spaces (URL-encoded):
curl "https://api.requiems.xyz/v1/finance/iban/DE89%203704%200044%200532%200130%2000" \
  -H "requiems-api-key: YOUR_API_KEY"

import requests

iban = "DE89370400440532013000"
url = f"https://api.requiems.xyz/v1/finance/iban/{iban}"
headers = {"requiems-api-key": "YOUR_API_KEY"}

response = requests.get(url, headers=headers)
data = response.json()["data"]

if data["valid"]:
    print(f"Country:   {data['country']}")
    print(f"Bank code: {data['bank_code']}")
    print(f"Account:   {data['account']}")
else:
    print("Invalid IBAN")

const iban = "DE89370400440532013000";
const response = await fetch(
  `https://api.requiems.xyz/v1/finance/iban/${iban}`,
  { headers: { 'requiems-api-key': 'YOUR_API_KEY' } }
);

const { data } = await response.json();

if (data.valid) {
  console.log(`Country:   ${data.country}`);
  console.log(`Bank code: ${data.bank_code}`);
  console.log(`Account:   ${data.account}`);
} else {
  console.log('Invalid IBAN');
}

require 'net/http'
require 'json'

iban = "DE89370400440532013000"
uri = URI("https://api.requiems.xyz/v1/finance/iban/#{iban}")

request = Net::HTTP::Get.new(uri)
request['requiems-api-key'] = 'YOUR_API_KEY'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

data = JSON.parse(response.body)['data']
if data['valid']
  puts "Country:   #{data['country']}"
  puts "Bank code: #{data['bank_code']}"
  puts "Account:   #{data['account']}"
else
  puts "Invalid IBAN"
end

Error Responses

internal_error

Unexpected server error (e.g. database unreachable).

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