Connect Claude to Frankfurter

Exchange rates for thirty world currencies - today's, any date since 1999, or a whole series - from the European Central Bank's daily reference rates. No key, no sign-up. Toolspoke puts 4 of its actions behind one MCP endpoint that Claude, Cursor, and Codex all speak.

Connect View pricing

Connection: Provider REST API
Authentication: None
Actions exposed: 4
Cost per call (typical): 1 credit
Adapter: Maintained by Toolspoke

Connected in three steps

1
Install Frankfurter
Open the marketplace in your workspace, add Frankfurter to the project your agents work in, and it appears on the gateway immediately.
2
Connect the credential
Nothing to connect. Frankfurter needs no credential.
3
Point your agent at the gateway
Give your client one address, https://toolspoke.com/mcp. Claude Code takes it as a command, Claude and Claude Desktop add it as a custom connector, and Cursor, Codex and VS Code each read it from a config file of their own.

.mcp.json

{
  "mcpServers": {
    "toolspoke": {
      "type": "http",
      "url": "https://toolspoke.com/mcp"
    }
  }
}

One block covers every tool you have installed. Frankfurter shows up in the client as soon as your policy allows it, and so does everything else you install later.

Where the address goes, per client

Claude Code: Run it in your project, then /mcp to sign in
claude mcp add --transport http toolspoke https://toolspoke.com/mcp
Claude and Claude Desktop: Settings, then Connectors, then Add custom connector
https://toolspoke.com/mcp
Cursor: ~/.cursor/mcp.json, or .cursor/mcp.json for one project
{ "mcpServers": { "toolspoke": { "url": "https://toolspoke.com/mcp" } } }
Codex: ~/.codex/config.toml
[mcp_servers.toolspoke] url = "https://toolspoke.com/mcp"
VS Code: .vscode/mcp.json, or the MCP: Add Server command
{ "servers": { "toolspoke": { "type": "http", "url": "https://toolspoke.com/mcp" } } }

What Frankfurter asks for

Frankfurter needs no credential. Install it and it works, and there is nothing of yours for Toolspoke to hold.

What Claude can do in Frankfurter

4 actions, each one declared and named by the connector rather than discovered at runtime. A workspace policy grants a person all of them, a hand-picked selection, everything on the read side, everything on the write side, or none.

Reads: 4Reads
Writes: 0Writes
Destructive: 0Destructive

Reads

Fetches data and changes nothing.

list_currencies
List the currencies Frankfurter tracks: about thirty ISO 4217 codes mapped to full names, from AUD to ZAR. This is the closed set - every `base` and `symbols` value the other operations accept must come from it, and a code outside it (no exotic pairs, no cryptocurrencies) is a 404 there, not here. Static and instant, which is why it is the connection test.
get_latest_rates
The most recent ECB reference rates against one base currency - the default answer to "what is X worth in Y today". Set `amount` to convert directly: amount 250, base GBP, symbols USD answers with 250 GBP already multiplied into dollars, no arithmetic on your side. Narrow with `symbols` unless you genuinely want all thirty rates. These are once-a-day reference figures published around 16:00 CET on ECB working days, not a live feed; on a weekend the response carries Friday's rates, and the `date` field names the day the rates are actually from - read it rather than assuming today.
get_historical_rates
The ECB reference rates for one past date, any day back to 1999-01-04 - what a dollar was worth in euros on the day an invoice was issued. Takes the same base, symbols and amount as get_latest_rates, so it converts historical amounts directly too. A date that was a weekend or ECB holiday answers with the most recent working day before it, and the response's `date` field names that day - read it rather than assuming you got the date you asked for.
get_time_series
Rates for every ECB working day in a date range, keyed by date - the raw material for "how has the euro moved against the dollar this quarter". Weekends and holidays are simply absent from the result rather than padded, so plot what is there. Narrow with `symbols`: a long range across all thirty currencies is a large payload, and this response is truncated past 12,000 characters, so for a multi-year sweep ask for the one or two pairs you actually want.

What it will not do

Enforced by the gateway rather than left to convention, which is why each of these can be stated flatly.

It cannot call anything else: The 4 actions above are the whole of it. A call to any other name is refused before it reaches Frankfurter rather than forwarded on, and connecting your account does not add to the list: it is fixed by the connector, not discovered at run time.
It only reads: Every action here reads. Nothing this connector can do changes anything in Frankfurter.
It reaches no further than your credential: Toolspoke holds no access to Frankfurter of its own. Every call carries the credential you stored and nothing besides, so whatever that credential cannot reach, this connector cannot reach either.
It never hears from Frankfurter: Nothing is pushed to it. There is no webhook, no subscription and no polling, so this connector cannot notice by itself that something changed in Frankfurter. An agent has to ask.
It does not smooth over provider limits: Toolspoke does not retry, queue or back off around Frankfurter's own rate limits. A call that Frankfurter refuses comes back to the agent as a failed call.

Before you connect it

What can Claude do in Frankfurter?

4 named actions: 4 that only read. They include list_currencies, get_latest_rates and get_historical_rates. Nothing outside that list is reachable: the connector declares each operation by name rather than proxying whatever an agent asks for.

What credentials does the Frankfurter connector need?

None at all. Frankfurter is reachable without one, so there is nothing of yours for Toolspoke to store.

Does the Frankfurter connector work with Cursor and Codex, or only Claude?

Any client that speaks MCP, and every one of them gets the same 4 actions. There is a single address, https://toolspoke.com/mcp. Claude Code adds it with claude mcp add --transport http, Claude and Claude Desktop take it as a custom connector in settings, Cursor reads it from .cursor/mcp.json, Codex from ~/.codex/config.toml, and VS Code from .vscode/mcp.json. Each of them signs in to the gateway itself, so there is no key to paste.

What does the Frankfurter connector not do?

The 4 actions above are the whole of it. A call to any other name is refused before it reaches Frankfurter rather than forwarded on, and connecting your account does not add to the list: it is fixed by the connector, not discovered at run time. Every action here reads. Nothing this connector can do changes anything in Frankfurter. Toolspoke holds no access to Frankfurter of its own. Every call carries the credential you stored and nothing besides, so whatever that credential cannot reach, this connector cannot reach either. Nothing is pushed to it. There is no webhook, no subscription and no polling, so this connector cannot notice by itself that something changed in Frankfurter. An agent has to ask. Toolspoke does not retry, queue or back off around Frankfurter's own rate limits. A call that Frankfurter refuses comes back to the agent as a failed call.

Can I limit which actions an agent can call?

Yes, in two places. The project switches Frankfurter's actions on and off one at a time, for everyone in the project at once, and the screen groups them by read, write and destructive so turning off everything that deletes is one click. An individual agent key can then be narrowed further, to particular toolkits in a project and to particular actions in a toolkit. Whatever it was granted, a key never reaches a project its owner cannot.

What gets recorded when an agent calls Frankfurter?

Every attempt, with the agent that made it and the person that agent belongs to, the full request payload, the response payload, the status, the duration, and the credits spent. Values whose key names a secret are masked out before the record is shown to anyone. An operation the connector marks as not retained never has its response body written at all, so the gateway keeps no second copy of what was read.

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