Fiat Exchange Rates ($0.003/call)

Foreign-exchange rates for 30+ fiat currencies (ECB reference data). Query: base (3-letter code, default USD), symbols (optional comma list, e.g. EUR,GBP,JPY), date (optional YYYY-MM-DD for historical rates back to 1999). Returns {base, date, rates}. Use for currency conversion, international pricing, and FX monitoring.

Paid endpoint: $0.003 per call via the x402 protocol (USDC on Base). An unpaid request returns 402 with payment requirements in the PAYMENT-REQUIRED response header; attach payment and retry.