Claude (claude.ai)
Add the server as a custom connector in Claude's settings.
Connect your client
Two values go into every client: the server URL and your API key as a bearer token. Pick your client below for the exact steps.
| Server URL | https://test.nbb-mcp.be/mcp |
|---|---|
| Header | Authorization: Bearer nbb_live_… |
| Transport | MCP streamable HTTP |
Guides
Claude Code
One <code>claude mcp add</code> command in your terminal.
ChatGPT
Developer-mode MCP connector, with the key as a bearer token.
Codex CLI
An <code>mcp_servers</code> block in ~/.codex/config.toml.
Any other MCP client
The raw connection details, plus a JSON config that most clients accept.
Before you start
You need a key first.
Your account page issues one — it starts with nbb_live_ and is shown once. If you have not signed up yet, sign in with your email address; the free plan needs no card.
Every guide ends with the same check — asking the assistant to find the annual accounts of Colruyt — so you can tell a working connector from a silent one.
Cloud clients need a public HTTPS endpoint. claude.ai and ChatGPT connect to this server from their own servers, so the URL has to be reachable from the internet with a valid certificate. Clients that run on your machine (Claude Code, Codex CLI) can reach a local or internal address directly.