ECB FX Reference

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Converts amounts across ECB-supported currencies from the European Central Bank's daily euro reference observations, returning source rates, publication date, cross-rate math, and attribution for $0.0015 USDC per call on Base. ([OpenAPI](https://official-fx-reference.vercel.app/openapi.json)) ([GitHub](https://github.com/ArgonautWorks/ecb-fx-reference))