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ECB Foreign Exchange Rates API
x402
ECB Foreign Exchange Rates API is a paid API for AI agents from 4yearcycle.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Returns European Central Bank (ECB) euro foreign exchange reference rates for ~30 currencies, with support for non-EUR base currencies via cross-rates.
Price / call$0.005
Success—
StatusUnknown
How this service works
Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, published each business day around 16:00 CET), rebased on request to any listed currency via EUR cross-rates and filtered to a requested symbol list; returns the reference date, the rate table and the ECB source attribution.
Output
A JSON object containing the base currency, ECB reference date (last business day), a map of currency codes to exchange rates per 1 unit of the base, the data source ('ECB'), and an attribution notice. Non-EUR bases are computed as cross-rates via EUR, rounded to 6 decimal places.
Example use cases
Multi-currency invoice reconciliation
“I need today's ECB reference rates for EUR, GBP, and CHF with USD as the base — I'm reconciling invoices across those currencies.”
Travel budget conversion
“What are the latest ECB exchange rates from EUR to JPY, USD, and GBP? I'm planning a trip and want official rates.”
Financial report FX snapshot
“Fetch me the current ECB FX rates for all available currencies using EUR as the base so I can record today's official rates in our financial report.”
Technical details
Endpoint
GEThttps://4yearcycle.com/x402/fx-ratesWhen to prefer
Choose this endpoint when you need authoritative, ECB-sourced euro foreign exchange reference rates — especially for compliance, financial reporting, or regulatory contexts where the ECB is the canonical source. Prefer it over commercial forex APIs when official European reference data matters, or when you need cross-rates among ~30 ECB-listed currencies without requiring a dedicated forex subscription.
Side effects
- Unsupported or misspelled currency code returns no rate or is silently ignored
- Non-ECB-listed currency symbols are dropped from the result
- ECB data may be one business day stale on weekends or holidays
- Invalid ISO 4217 format in 'base' or 'symbols' may return errors or empty results
- Payment failure (x402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"base": "USD",
"date": "2026-08-17",
"rates": {
"CHF": 0.809885,
"EUR": 0.862589,
"GBP": 0.737514,
"JPY": 159.225395
},
"notice": "ECB euro foreign exchange reference rates, available free of charge at ecb.europa.eu; non-EUR bases are cross-rates computed via EUR.",
"source": "ECB"
}
}Tags
x402
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