Frankfurter MCP

GitHub

Convert currencies and look up current or historical exchange rates straight from your AI assistant, through the official Model Context Protocol server.

Add https://mcp.frankfurter.dev/ as a remote HTTP server. No API key or registration required.

Jump to: Claude | Cursor | Codex | Antigravity

ChatGPT

Configure within the ChatGPT web or desktop app settings:

1. Open **Settings → Apps** (or **Connectors**).
2. In the upper right, click **Advanced settings → enable Developer mode** (this unlocks custom app creation).
3. Return to the **Apps** submenu, click **Create app** (or **Create connector**).
4. Enter the endpoint URL: https://mcp.frankfurter.dev/.
5. Under authentication, choose None.

Claude

Anthropic's Claude supports remote MCP servers depending on the tool you use:

Claude Cowork (Web, Mobile, Workspaces)

Configure custom connectors centrally in your Claude account:

1. Navigate to **Customize → Connectors** (or **Settings → Connectors**).
2. Click the **"+"** button and select **Add custom connector**.
3. Enter the server endpoint URL: https://mcp.frankfurter.dev/.
4. Click **Add** to finish. Once connected, toggle the connector on in your chat interface.

Claude Desktop

Bridge the local desktop app to the remote HTTP server using the mcp-remote utility. Add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "frankfurter": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.frankfurter.dev/"]
    }
  }
}

Claude Code (CLI)

Add the remote HTTP server directly in your terminal:

claude mcp add --transport sse frankfurter https://mcp.frankfurter.dev/

Cursor

Configure Cursor by editing ~/.cursor/mcp.json or project-level .cursor/mcp.json:

{
  "mcpServers": {
    "frankfurter": {
      "url": "https://mcp.frankfurter.dev/"
    }
  }
}

Alternatively, open Cursor settings (⌘ + Shift + J), navigate to Features → MCP, click + Add New MCP Server, name it frankfurter, select type SSE, and enter https://mcp.frankfurter.dev/.

Codex

Add the server using the Codex CLI:

codex mcp add frankfurter --url https://mcp.frankfurter.dev/

Or add it manually to your ~/.codex/config.toml configuration file:

[features]
  experimental_use_rmcp_client = true

  [mcp_servers.frankfurter]
  url = "https://mcp.frankfurter.dev/"

Antigravity

Configure within the Antigravity CLI overlay by running:

/mcp

Or configure manually in ~/.gemini/antigravity-cli/mcp_config.json:

{
  "mcpServers": {
    "frankfurter": {
      "serverUrl": "https://mcp.frankfurter.dev/"
    }
  }
}

Tools

Once connected, the following tools become available to your AI assistant:

convert

Convert an amount between two currencies. Returns the converted amount and the rate.
Parameters:

• amount (number, required): The total value to convert.
• from (string, required): Three-letter base ISO currency code (e.g. USD).
• to (string, required): Three-letter target ISO currency code (e.g. EUR).
• date (string, optional): A specific date YYYY-MM-DD for historical conversion.

get_rates

Look up reference exchange rates.
Parameters:

• date (string, optional): Rate date YYYY-MM-DD (defaults to latest).
• base (string, optional): Three-letter base currency (default: EUR).
• quotes (string, optional): Filter results by comma-separated currency codes.

list_currencies

List all supported ISO 4217 currency codes and names.

If you need a time series, a historical range, provider-specific rates, or bulk data, use the REST API.