Iban Check

{
  "check_digits": {
    "algorithm": "…",
    "computed": "89",
    "given": "89",
    "remainder": 1
  },
  "checked_at": "2026-07-26T09:00:00.000Z",
  "checks": [
    {
      "findings": 0,
      "key": "check_digits",
      "source": "ISO 7064 MOD 97-10",
      "status": "ok"
    }
  ],
  "country": {
    "also_used_by": [],
    "code": "DE",
    "effective": "Jul-07",
    "in_registry": true,
    "name": "Germany",
    "sepa": true
  },
  "findings": [],
  "input": {
    "electronic": "DE89370400440532013000",
    "print": "DE89 3704 0044 0532 0130 00",
    "raw": "DE89 3704 0044 0532 0130 00"
  },
  "interpretations": [
    {
      "key": "print_grouping",
      "reading": "…"
    }
  ],
  "not_checked": [
    "…"
  ],
  "parts": {
    "bank_identifier": {
      "pattern": "8!n",
      "position": "1-8",
      "value": "37040044"
    },
    "bban": "370400440532013000",
    "branch_identifier": null,
    "check_digits": "89",
    "country_code": "DE"
  },
  "source": {
    "countries": 89,
    "digest": "…",
    "name": "IBAN Registry (SWIFT, registration authority under ISO 13616-2)",
    "retrieved": "2026-05-10"
  },
  "structure": {
    "bban_pattern": "8!n10!n",
    "iban_pattern": "DE2!n8!n10!n",
    "length_actual": 22,
    "length_expected": 22,
    "segments": [
      {
        "kind": "digits",
        "length": 8,
        "ok": true,
        "value": "37040044"
      }
    ]
  },
  "summary": {
    "errors": 0,
    "infos": 0,
    "warnings": 0
  },
  "valid": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.ozdreamtools.de/api/iban/check' \
  -H 'content-type: application/json' \
  --data-raw '{"iban":"DE89 3704 0044 0532 0130 00"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.ozdreamtools.de/api/iban/check' \
  -H 'content-type: application/json' \
  --data-raw '{"iban":"DE89 3704 0044 0532 0130 00"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.ozdreamtools.de%2Fapi%2Fiban%2Fcheck&method=POST
const res = await pay("https://api.ozdreamtools.de/api/iban/check", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "iban": "DE89 3704 0044 0532 0130 00"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.ozdreamtools.de/api/iban/check",
        json={
            "iban": "DE89 3704 0044 0532 0130 00",
        },
    )
    print(res.status_code, res.text)