temsor API
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IBAN Validation

Validates an IBAN from any of 70+ countries: checksum, country length and in-country account structure, and resolves the bank and branch codes.

POST /v1/iban/validate · 1 credit · deterministic

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POST/v1/iban/validate 
{
  "iban": "DE89 3704 0044 0532 0130 00"
}
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Why this exists

Built for hostile input

A Turkish address arrives as "Cd." or "Cad." or "Caddesi", with the flat number glued to the building number. Generic parsers drop half of it silently. This one tells you what it could not place.

History cannot be backfilled

The exchange-rate archive grows every business day and each point keeps its source URL and content hash. A competitor can read today’s bulletin too — nobody can produce last quarter’s.

You only pay for work

Repeated inputs come from cache and cost zero credits. If a response ever fails its own schema, the call is refunded automatically.

Endpointsexpand any row to see the parameters and call it live

Validation1

/v1/iban/validate IBAN Validation deterministic 1 credit

Validates an IBAN from any of 70+ countries: checksum, country length and in-country account structure, and resolves the bank and branch codes.

Most free libraries stop at the mod-97 checksum. That only says the digits are self-consistent — not that the number could exist in that country. This checks the country's BBAN structure too, so a wrong-length or wrong-shaped account is rejected before your payment file reaches the bank. When only the two check digits are wrong, the correct ones are computed and returned as a suggestion, because that is what people actually mistype. Turkish IBANs additionally resolve to the bank name.

Parameters

iban* string IBAN, boşluklu veya boşluksuz.
expectCountry string Beklenen ülke kodu (ISO 3166-1 alfa-2).
POST/v1/iban/validate 
{
  "iban": "DE89 3704 0044 0532 0130 00"
}
no request sent yet
Press Run to call the live API from your browser.

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Use it from an AI assistantthe same catalogue, exposed as MCP tools

Every endpoint is also published over the Model Context Protocol, so Claude, ChatGPT or your own agent can call it directly — no glue code, no wrapper functions. The assistant sees the same input schemas and the same metering.

Currently 11 tools. New endpoints appear automatically; nothing to update on your side.

claude_desktop_config.json

{
  "mcpServers": {
    "temsor": {
      "url": "https://api.temsor.com/mcp",
      "headers": { "x-api-key": "fk_live_…" }
    }
  }
}

Quickstart

Official client: npm install temsor-api · npmjs.com/package/temsor-api

Node.js

import Client from "temsor-api";

const api = new Client({ apiKey: KEY });
const r = await api.${(() => {
  const first = apis[0];
  return first.slug.split(/[/-]/).map((p, i) => (i === 0 ? p : p[0].toUpperCase() + p.slice(1))).join('');
})()}(${esc(JSON.stringify(apis[0].examples[0]?.input ?? {}))});
console.log(r, r.$meta);

cURL

curl -s https://api.temsor.com/v1/iban/validate \
  -H "content-type: application/json" \
  -H "x-api-key: fk_live_…" \
  -d '{"iban":"DE89 3704 0044 0532 0130 00"}'

JavaScript

const res = await fetch("https://api.temsor.com/v1/iban/validate", {
  method: "POST",
  headers: { "content-type": "application/json", "x-api-key": KEY },
  body: JSON.stringify({"iban":"DE89 3704 0044 0532 0130 00"})
});
const { data } = await res.json();

Python

import httpx
r = httpx.post("https://api.temsor.com/v1/iban/validate",
    headers={"x-api-key": KEY},
    json={"iban":"DE89 3704 0044 0532 0130 00"})
data = r.json()["data"]