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MCP Currency Converter in Claude.ai and Claude Desktop connectors

ECB reference rates with the rate date on every answer. It caches the European Central Bank's daily and historical euro reference rates, converts between any currencies the ECB quotes through EUR cross rates, and emits the exact fx_rates object the expense tracker needs to rebill a project in one currency.

Every tool this server has is a read against the ECB rate feed, so the connector needs nothing more than the URL: no file gets written, no download link is ever produced.

What you get

You say	Tool
What is 4,500 EUR in USD today?	`convert`
What was the GBP rate on 30 August?	`rate_on`
Rebill Nova in USD using today's rates.	`fx_rates_for then expense_to_invoice`

Counted from the published history file: the ECB series runs 1999-01-04 to 2026-09-02, 10,104 calendar days holding 7,084 dates, so 29.9% of dates carry no rate. Every answer names the rate date it actually used.

Connect it, no install

https://mcp.zovo.one/mcp/connect mints an anonymous token and prints a URL per server, including this one, shaped like https://mcp.zovo.one/mcp/currency/t/<token>. That URL works with no headers: the token is in the path, not in an Authorization field this form does not have.

Open https://mcp.zovo.one/mcp/connect and copy the URL printed for MCP Currency Converter.
There is no config file here: the Add custom connector form asks for a name and a Remote MCP server URL, with an Advanced settings section for an optional OAuth Client ID and Client Secret.
Paste the URL as the Remote MCP server URL. Leave the optional OAuth Client ID and Client Secret blank; this endpoint does not use them.
Click Connect, then turn the connector on for a conversation from the + button, Connectors.

Idle anonymous tokens are swept after 30 days. Since this route has no filesystem, a file MCP Currency Converter generates comes back as a download link that expires after one hour. A Pro key can replace the token in the same URL and removes the free-tier limits.

Claude.ai and Claude Desktop connectors notes worth knowing first

On an individual Pro or Max plan you add the connector yourself from Customize, Connectors. On Team and Enterprise it is the other way round: only an Owner or Primary Owner can add a custom connector, at Organization settings, Connectors, and members then connect to what the Owner added rather than pasting their own URL.

Free: latest rates, convert, convert_many, fx_rates_for, history windows up to 90 days. Pro is $19 once, verified offline, and binds to the token after checkout.

Questions

Does this need OAuth?

No. Add custom connector offers an Advanced settings section with an OAuth Client ID and Client Secret, but the connect-by-URL route does not use it. Leave both blank: the token in the URL path is what authenticates.

I am on a Team or Enterprise plan and cannot add a connector.

That is documented, not a bug: on Team and Enterprise, only an Owner or Primary Owner can add a custom connector, at Organization settings, Connectors, Add, Custom, Web. After that, members connect to the URL the Owner added from Customize, Connectors.

Can I use my Pro key instead of the free anonymous token?

Yes. The token segment of the URL from /mcp/connect can be replaced with a Pro key, which removes the free-tier limits on MCP Currency Converter for that connector.

Why did a generated file come back as a link instead of opening?

The connector runs server-side with no filesystem of its own, so any file MCP Currency Converter produces is handed back as a download link that expires after one hour, rather than a path on disk.

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