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FX Reference Rates API – Historical Rates
x402
FX Reference Rates API – Historical Rates is a paid API for AI agents from fx-reference-rates.regnotes.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns ECB foreign exchange reference rates for a specific historical date, with any base currency, falling back to the nearest prior publication day if the requested date had no ECB publication.
Price / call$0.002
Success—
StatusUnknown
How this service works
ECB reference rates on a given date in any base; non-publication days fall back to the previous publication day (as_of).
Output
A JSON object containing the base currency, the actual publication date used (as_of), the originally requested date, and a map of currency codes to exchange rates. If the requested date falls on a non-publication day (weekend or ECB holiday), the as_of field reflects the most recent prior publication date.
Example use cases
Historical invoice currency conversion
“I need to find the official ECB exchange rate between EUR and USD on November 30, 2023 — it's for an invoice reconciliation and I need the exact ECB rate for that date.”
Weekend date fallback handling
“What were the ECB FX rates on Saturday December 23, 2023, using GBP as the base? I know ECB doesn't publish on weekends so just give me the closest prior publication day.”
Multi-currency portfolio snapshot
“Can you pull the ECB reference rates for all currencies relative to JPY as the base on January 2, 2024? I want to see what everything was worth in yen at the start of the year.”
Technical details
Endpoint
GEThttps://fx-reference-rates.regnotes.workers.dev/v1/rates/historical?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need official ECB foreign exchange reference rates for a specific past date, especially for financial reporting, compliance, invoice reconciliation, or audit purposes where the authoritative ECB rate (not a market rate) is required. Prefer this over real-time FX endpoints when historical accuracy and ECB provenance matter. The automatic fallback to the previous publication day makes it reliable even for weekends and holidays.
Side effects
- Date before ECB data coverage — no historical data available for very early dates
- Invalid date format — must be YYYY-MM-DD pattern
- Invalid base or symbol currency code — must be one of the 30 supported 3-letter ISO codes
- Date in the far future — no ECB data available yet
- Malformed symbols parameter — comma-separated 3-letter codes required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"base": "EUR",
"as_of": "2026-06-30",
"rates": {
"GBP": 0.86178,
"USD": 1.1394
},
"requested_date": "2026-06-30"
}
}Tags
x402
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