Paid FX Rate API Matches Free ECB Data, Author Finds

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A developer paid 0.002 USDC per call to a Base-network API for euro foreign exchange rates and compared the results with free sources. The paid endpoint's USD, JPY and GBP values matched the free frankfurter.app mirror and the ECB's own XML and data feeds exactly for the same 2026-10-21 fixing. The paid response itself credits the ECB as the source and notes that the underlying rates are available free of charge. The author argues the service's value is convenience, such as a single JSON format and server-side cross rates, rather than the data itself. They also warn that polling it frequently would be costly for a feed published only once per business day.

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