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Historical Fiat Exchange Rates API
x402
Historical Fiat Exchange Rates API is a paid API for AI agents from currency-api-production-4a8d.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).
Returns historical fiat currency exchange rates for a specified date (back to 1999-01-04) and base currency, sourced via ECB/Frankfurter
Price / call$0.001
Success—
StatusUnknown
How this service works
Historical fiat exchange rates for a given date (YYYY-MM-DD, back to 1999-01-04) and base currency; optionally restrict to specific targets.
Output
Returns a JSON object containing the specified base currency, the queried date, and a map of target currency codes to their exchange rate values relative to the base on that date. If symbols are specified, only those currency pairs are returned; otherwise all available rates for that date are included.
Example use cases
Historical invoice reconciliation
“I have an invoice from August 3 2021 that was billed in EUR — what was the EUR to USD exchange rate on that exact date so I can reconcile it in our accounting system?”
Research past currency crisis
“Can you pull the historical exchange rates for USD against TRY, ARS, and BRL on September 1 2018? I'm studying emerging market currency movements around that time.”
Travel expense reimbursement
“I need to convert some GBP expenses from my London trip on November 20 2023 back to USD — what was the GBP to USD exchange rate on that day according to ECB historical data?”
Technical details
Endpoint
POSThttps://currency-api-production-4a8d.up.railway.app/rates/historicalWhen to prefer
Choose this endpoint when you need exchange rates for a specific historical date rather than the current rate. It is ideal for financial reconciliation, auditing, expense reporting, or research requiring rates on a past date. For current/latest rates, prefer the sibling latest-rates endpoint. For currency conversion with amount calculation, prefer the conversion endpoint.
Side effects
- Date before 1999-01-04 returns an error (data not available before ECB history begins)
- Weekend or holiday dates may return no data or the most recent prior business day's rates
- Invalid ISO 4217 currency code returns a 4xx error
- Date format not matching YYYY-MM-DD causes a validation error
- Unknown or unsupported currency in symbols list may result in partial or empty response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| base | string | Base currency ISO 4217 code, e.g. 'USD'. Defaults to USD if omitted. |
| date | string | Date in YYYY-MM-DD format, back to 1999-01-04, e.g. '2024-01-15'. |
| symbols | array | Optional list of target currency codes to restrict the response, e.g. ['EUR', 'GBP']. Omit for all rates. |
Tags
x402
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