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 here except license_activate is a read, so this is the one server whose whole tool list is safe in autoApprove. The only network destination is the ECB, and nothing about your amounts leaves the machine.
| 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.
The file is mcp.json, and the key inside it is mcpServers.
| Scope | Path |
|---|---|
| Cline CLI | ~/.cline/mcp.json |
| The editor extension | opened from the Cline panel, not by path; the documentation deliberately calls it the MCP settings JSON used by the extension |
{
"mcpServers": {
"currency": {
"command": "npx",
"args": ["-y", "@theluckystrike/mcp-currency"],
"disabled": false,
"autoApprove": []
}
}
}No full-app restart. The MCP settings actions include restarting an unresponsive server if its tools do not appear.
The npm publish of @theluckystrike/mcp-currency is pending; until then use the .mcpb bundle or a clone and build from the latest release.
There is no hosted endpoint for this one yet. MCP Currency Converter runs locally over stdio with the config above, which is also the only form in which it reads and writes files on your own disk. Three of the servers in this collection are served at https://mcp.zovo.one/mcp/<name> over MCP streamable HTTP: time-tracker, price-tracker and invoice.
Cline is the one client here with an unsafe transport default. `type` selects it, and omitting `type` falls back to the legacy sse transport, so a streamable HTTP endpoint needs it written in or you will debug a server that is fine. Local entries carry "disabled" and an "autoApprove" array.
Free: latest rates, convert, convert_many, fx_rates_for, history windows up to 90 days. Pro is $19 once, verified offline.
The CLI reads ~/.cline/mcp.json. For the extension, do not hunt for a path: MCP Servers icon, Configure tab, Configure MCP Servers. cline mcp opens a wizard, and cline config mcp --json is the non-interactive form.
Set the transport explicitly. Omitting type falls back to the legacy sse transport, so streamable HTTP needs "type": "streamableHttp" written in. It is the one default here that sends you debugging a server that works.
Approve the read-only ones and leave the writing ones behind a click: each entry carries an autoApprove array and a disabled flag.
MCP Currency Converter in detail · The same server in Windsurf and Claude Desktop · Every server in Cline · Guides · Cline docs