How do I validate IBANs from several countries in one agent run?

Steps

1. Install the Strale Python SDK, straleio.
2. Create the client with your API key.
3. Collect the IBANs.
4. Validate each one and read the bank code and country code.

The solution

# pip install straleio
from straleio import Strale, DoRequest

strale = Strale(api_key="sk_live_YOUR_KEY")  # the SDK needs a key, even for free tools

ibans = [
    "DE89370400440532013000",  # Germany
    "GB29NWBK60161331926819",  # United Kingdom
    "FR7630006000011234567890189",  # France
    "SE4550000000058398257466",  # Sweden
]

for iban in ibans:
    result = strale.do(DoRequest(
        capability_slug="iban-validate",
        inputs={"iban": iban},
        max_price_cents=5,
    ))
    status = "valid" if result.output["valid"] else "INVALID"
    print(f"{iban[:4]}... {status}, bank code {result.output.get('bank_code', 'N/A')}")

How it works

IBAN length and layout differ by country, and the tool applies each country's rules. A German IBAN has 22 characters, a French one has 27.

For thousands of IBANs, send the calls concurrently. The REST API allows a limited number of requests per second for each key; the limit is in Connect over the REST API.

The result includes the parsed bank_code, branch_code where the country has one, and country_code, which you can check against your own bank reference data. A valid IBAN does not mean the account exists.

Tools in this guide