IBAN Validation

Check an IBAN's format, length and checksum, and split out the country, bank code and branch code.

Free to try Pay by wallet (x402) iban-validate

Example

Example answer

{
  "bban": "50000000058398257466",
  "valid": true,
  "bank_code": "500",
  "branch_code": null,
  "check_digits": "45",
  "country_code": "SE",
  "expected_length": 24
}

Try it

Runs the real tool from your browser, with no key. Free calls are limited to 300 a month across all free tools.

Inputs (JSON)

{
  "iban": "SE4550000000058398257466"
}

Edit the values, then run.

Inputs

Field	Type	Required	What it is
`iban`	string	Yes	IBAN to validate (e.g. SE3550000000054910000003)

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`error`	string	Sometimes (present only for some inputs)
`valid`	boolean	Always (present in every successful answer)
`bank_code`	string	Always (present in every successful answer)
`branch_code`	string	Sometimes (present only for some inputs)
`country_code`	string	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Free tool: works without a key, within a monthly allowance. Add your key for more.
curl -X POST https://api.strale.io/v1/do \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "iban-validate",
    "inputs": {
      "iban": "SE4550000000058398257466"
    },
    "max_price_cents": 5
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "iban-validate",
    "inputs": {
      "iban": "SE4550000000058398257466"
    },
    "max_price_cents": 5
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "iban-validate",
  inputs: {
    "iban": "SE4550000000058398257466"
  },
  max_price_cents: 5,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="iban-validate",
    inputs={
        "iban": "SE4550000000058398257466",
    },
    max_price_cents=5,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/iban-validate?iban=SE4550000000058398257466'

Limitations

IBAN checks do not confirm an active account
Validates structure and checksum only — does not confirm the account is open or active
What to do instead: Use a SEPA test transaction (€0.01) or bank account verification API to confirm the account is live before large transfers
Bank details can be incomplete outside SEPA
Covers all SEPA-zone IBANs. Non-SEPA country IBANs validated structurally but bank lookup may be incomplete
What to do instead: For non-SEPA IBANs, cross-reference the bank code portion against SWIFT's IBAN Plus directory