What’s the best free currency converter API for historical data?

UniRateAPI—57 years back to 1967, 2,000 daily requests, no paywall tricks.

Do any free currency APIs support crypto?

Yes, UniRateAPI covers crypto and metals alongside fiat, 593 total.

Is Frankfurter really unlimited with no API key?

Correct—open source, ECB-sourced, but limited to ~30 currencies and post-1999 history.

UniRateAPI's 57-Year Data Hoard Makes Other Free Currency APIs Look Pathetic

Backtesting trading bots without decades of exchange rates? Nightmare. UniRateAPI changes that with free access to data back to 1967, crushing the competition.

theAIcatchup Apr 11, 2026 3 min read

Chart comparing top free currency converter APIs by historical data and limits

⚡ Key Takeaways

UniRateAPI dominates with 57 years of free historical data — unmatched. 𝕏
Frankfurter's unlimited no-key access shines for quick fiat prototypes. 𝕏
'Free' tiers are hooks; plan for paid upgrades as your app grows. 𝕏

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theAIcatchup

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#currency converter APIs #developer APIs #developer APIs 2026 #exchange rates #exchange rates API #free currency APIs #free exchange rates #historical currency data #historical data API

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Originally reported by Dev.to

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