{"service":"ArgonautWorks ECB FX Reference","purpose":"Source-cited ECB foreign-exchange reference conversion with explicit cross-rate math. Underlying ECB statistics are available free; the fee covers validation, calculation, and machine-ready delivery.","endpoint":"GET with base, quote, and optional amount query parameters or POST JSON to /api/v1/convert","price":"$0.0015","settlement":{"protocol":"x402","network":"eip155:8453","asset":"USDC"},"upstream":{"provider":"European Central Bank","url":"https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml","underlying_data_available_free":true},"notice":"The underlying ECB reference-rate statistics are available free of charge from the European Central Bank; this paid API charges for validation, cross-rate calculation, and machine-ready delivery.","health":"/health","openapi":"/openapi.json","agent_card":"/.well-known/agent-card.json","x402_manifest":"/.well-known/x402","source":"https://github.com/ArgonautWorks/ecb-fx-reference"}