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Factline FX Rate
x402
Factline FX Rate is a paid API for AI agents from factline.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Converts currency amounts using official ECB reference rates for ~30 currencies, with support for historical dates
Price / call$0.001
Success—
StatusUnknown
How this service works
Currency exchange rates and FX conversion, official ECB reference rates for USD, EUR, GBP, JPY and 25 more. Use to convert an amount between currencies with an official, citable rate: the European Central Bank's reference rates for about 30 currencies (USD, GBP, JPY, CHF, CNY...), cross rates computed from the euro rates, today or for a past date such as an invoice date. Input: base (default EUR), symbols, amount, optional date.
Output
Returns the exchange rate(s) from the base currency to the requested target currencies, the converted amount, and the reference date used — sourced from the European Central Bank's official published rates. For cross rates not directly published by ECB (non-EUR pairs), rates are computed via the euro as the intermediate currency.
Example use cases
Invoice currency conversion for accounting
“I need to convert 12,450 British pounds to euros using the official ECB rate from the invoice date, which was 2024-09-20.”
Multi-currency dashboard snapshot
“Pull today's ECB reference rates for USD, GBP, JPY, CHF, and CNY all relative to EUR — I need them for our morning FX report.”
Cross-rate calculation for international payment
“What's the official exchange rate between Swiss francs and Japanese yen today? Convert 5,000 CHF to JPY using the ECB rate.”
Technical details
Endpoint
GEThttps://factline.dev/v1/fx/rate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need an official, citable exchange rate sourced from the European Central Bank — particularly for invoicing, accounting, compliance, or any context where a reputable reference rate is required rather than a market mid-rate. It is ideal for EUR-centric conversions and historical rate lookups within the last 90 days. Prefer this over commercial FX APIs when auditability and official provenance of the rate matter.
Side effects
- Invalid or unsupported currency code returns an error — only the ~30 ECB-tracked currencies are supported
- Date outside the 90-day historical window is rejected
- Weekend or ECB holiday dates may return the most recent available rate rather than the exact requested date
- Malformed date format (not YYYY-MM-DD) returns a validation error
- Empty or missing symbols defaults to all ~30 currencies, which may return more data than expected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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