io.github.Exchange-RateAPI/mcp-server

Exchange Rate API

Is the Exchange Rate API MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.

Real-time & historical exchange rates for 160+ currencies, mid-market (Reuters/Refinitiv).

alive probed 2026-11-14 · unchanged since 2026-10-30

4tools

2.3ktokens in Claude Opus 5.5

1.1 %of Claude's 200k window

0.9×the median server

220 msto initialize

7 msto list tools

Run it: npx -y @exchangerateapi/mcp-server@1.0.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: exchange-rateapi-mcp 1.0.1
Capabilities: tools
Instructions: none
Of a 1M window: 0.2 % of a 1M context window
Count: 2.3k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 2.3k. The o200k_base estimate is 1.4k. Counted again when the tool definitions change. Method.
Repository: https://github.com/Exchange-RateAPI/mcp-server
Website: https://exchange-rateapi.com
Registry: active, updated 2026-06-20 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.63×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
get_rates	834	512	36 %
get_historical_rates	679	417	30 %
get_exchange_rate	547	336	24 %
list_currencies	225	138	10 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention exchange.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.