Historical reference exchange rates with a source link per row. Tools: get_latest_rate, get_history.
Scored across 2 tools
The two tools have clearly distinct purposes: get_latest_rate returns the current rate, while get_history returns dated historical rates. Description wording explicitly separates them, so an agent cannot confuse them.
Both tools follow the same get_<noun> pattern (get_history, get_latest_rate), which is predictable and readable. No convention mixing.
Only 2 tools is thin for an FX reference-rate domain; a single-purpose service can be small, but even the minimal rate workflow typically warrants a bit more surface. It is borderline rather than clearly wrong.
Core rate retrieval (latest and historical) is covered, but obvious adjacent operations are missing: no currency conversion, no listing of supported currency pairs, and no multi-date/range query beyond a day-count parameter. Agents can work around these but will hit dead ends.
Get dated historical reference rates for a currency pair for a number of days, or a single date. Use for invoices, reports and reconciliation.
Inputs: to (required), from (required), date, days.
Get the latest available source-linked reference exchange rate for a currency pair (e.g. USD to CNY). Reference data, not a transaction quote.
Inputs: to (required), from (required).
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Exchange rates for about 150 currencies from central banks (ECB and others). Free, no key.
Official ECB euro reference rates for invoices and tax returns. $0.004/call via x402.
Official exchange rates from central banks: latest & historical rates plus currency conversion.
Latest and historical ECB foreign-exchange reference rates for 30+ currencies, via Frankfurter.
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