Exchangerate.host

Free foreign exchange & crypto rates API

Exchangerate.host provides real-time and historical foreign exchange rates, currency conversion, and crypto exchange rates via a simple REST API. It covers 19 years of historical data with 99.99% average uptime. The API delivers data in JSON format and supports time-series queries, fluctuation data, and batch conversions. For OpenClaw agents, this API is useful for currency conversion in international workflows — converting prices between USD and INR, generating exchange rate reports, or monitoring currency movements. It's a simple, reliable data source for any skill that needs to work with multiple currencies.

Tags: finance, currency

Category: Currency Exchange

Use Cases

  • Auto-convert prices between currencies when discussing SaaS pricing (USD ↔ INR)
  • Track daily exchange rate movements and alert on significant changes
  • Generate weekly currency rate reports for international business planning

Tips

  • Cache exchange rates locally — they don't change by the second for most use cases
  • Use the timeseries endpoint for historical rate analysis instead of making daily calls
  • For basic USD/INR conversion, consider using the free Open Exchange Rates or ECB data as alternatives

Known Issues & Gotchas

  • Previously fully free with no key — now requires API key registration even for free tier
  • Free tier has limited features compared to what's advertised on GitHub listings
  • Some endpoints that were free may now require a paid plan

Frequently Asked Questions

Is Exchangerate.host actually free?

There's a free tier with 10,000 requests/month, but it now requires an API key (registration). The fully keyless access that existed earlier has been deprecated. Paid plans start at $14.99/mo.

How current are the exchange rates?

Rates are sourced from financial data providers and updated frequently throughout the day. They're suitable for informational purposes but not for real-time trading where millisecond accuracy matters.

Does it support cryptocurrency rates?

Yes. The API supports major cryptocurrencies alongside traditional fiat currencies. You can convert between crypto and fiat or query historical crypto rates.