temsor API
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RF Creditor Reference

Validates or generates an ISO 11649 RF creditor reference (mod-97 check digits).

POST /v1/finance/creditor-ref · 1 credit · deterministic

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POST/v1/finance/creditor-ref 
{
  "reference": "RF18 5390 0754 7034"
}
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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.

Every number carries its provenance

Each archived point stores the source URL and a content hash of the page it came from, and the archive is committed to a Merkle root anchored in Bitcoin. Every commitment — with its cutoff, leaf count and anchors — is published at /proof, so you can check for yourself how current the latest one is. The bulletins themselves are public and anyone can read them; what this adds is that a number you quote can be shown to be the number we held on that date, and that it has not been edited since.

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

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Finance1

/v1/finance/creditor-ref RF Creditor Reference deterministic 1 credit

Validates or generates an ISO 11649 RF creditor reference (mod-97 check digits).

SEPA credit transfers carry an RF creditor reference so remittance data survives the payment chain. The check digits are the same ISO 7064 mod-97 used for IBAN: RF and the two digits move to the end, letters become 10–35, remainder must be 1. If the input already starts with RF and two digits it is validated; otherwise a 1–21 character alphanumeric payload is encoded. A bad checksum is rejected with 400 — a self-inconsistent reference must not enter a payment file.

Parameters

reference* string ISO 11649 RF creditor reference, or a 1–21 character payload to encode.
POST/v1/finance/creditor-ref 
{
  "reference": "RF18 5390 0754 7034"
}
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.

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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/finance/creditor-ref \
  -H "content-type: application/json" \
  -H "x-api-key: fk_live_…" \
  -d '{"reference":"RF18 5390 0754 7034"}'

JavaScript

const res = await fetch("https://api.temsor.com/v1/finance/creditor-ref", {
  method: "POST",
  headers: { "content-type": "application/json", "x-api-key": KEY },
  body: JSON.stringify({"reference":"RF18 5390 0754 7034"})
});
const { data } = await res.json();

Python

import httpx
r = httpx.post("https://api.temsor.com/v1/finance/creditor-ref",
    headers={"x-api-key": KEY},
    json={"reference":"RF18 5390 0754 7034"})
data = r.json()["data"]