Best Currency and Exchange Rate APIs in 2026
TL;DR
If you just want the answer: ExchangeRate-API for the most generous free tier, Open Exchange Rates for production reliability, Fixer for ECB-sourced data with deep history, CurrencyLayer for historical analysis, CurrencyFreaks for crypto and fiat in one API, and Frankfurter for a completely free, open-source option that needs no API key. Read on for the full breakdown.
Key Takeaways
- ExchangeRate-API offers 1,500 free requests/month with simple REST endpoints for 160+ currencies. Best starting point for side projects and MVPs.
- Open Exchange Rates is the developer standard -- used by Shopify, Etsy, and thousands of production apps. Hourly updates, 170+ currencies, transparent data sourcing.
- Fixer (by APILayer) provides ECB reference rates and historical data back to 1999 with time-series and fluctuation endpoints.
- CurrencyLayer (also APILayer) specializes in historical exchange rate data with 168 currencies and minute-level updates on higher plans.
- CurrencyFreaks covers both fiat currencies and cryptocurrencies in a single API with 1,000 free requests/month.
- Frankfurter is entirely free and open source, powered by ECB data, requires no API key, and can be self-hosted.
The Currency API Landscape in 2026
Currency and exchange rate APIs fall into three categories.
Commercial data aggregators (Open Exchange Rates, ExchangeRate-API) collect rates from multiple financial sources and aggregate them into clean REST endpoints. They support the widest range of currencies with features like pair conversion, enriched metadata, and time-series analysis. These are the workhorses behind e-commerce platforms and fintech dashboards.
APILayer marketplace providers (Fixer, CurrencyLayer) share similar infrastructure and pricing models. They specialize in sourcing data from authoritative institutions like the European Central Bank. Their strength is deep historical data and analytical endpoints. The tradeoff is smaller free tiers.
Free and open-source providers (Frankfurter) offer exchange rates at zero cost with no signup. They cover fewer currencies and provide no SLA, but for projects that only need major world currencies with daily updates, they are the most frictionless option.
Quick Comparison Table
| Provider | Best For | Free Tier | Paid From | Currencies | Update Freq. |
|---|---|---|---|---|---|
| ExchangeRate-API | Generous free tier | 1,500 req/mo | $10/mo | 161 | Daily to minute |
| Open Exchange Rates | Production reliability | 1,000 req/mo | $12/mo | 170+ | Hourly |
| Fixer | ECB reference rates | 100 req/mo | $10/mo | 170 | Hourly |
| CurrencyLayer | Historical analysis | 100 req/mo | $10/mo | 168 | Daily to minute |
| CurrencyFreaks | Crypto + fiat | 1,000 req/mo | $10/mo | 180+ | Varies |
| Frankfurter | Zero cost, no signup | Unlimited | Free | ~33 | Daily |
1. ExchangeRate-API -- Most Generous Free Tier
Best for: Side projects, MVPs, and small applications needing free exchange rates with minimal friction
ExchangeRate-API offers the most generous free tier in the currency API space: 1,500 requests per month with no credit card required. The API design prioritizes simplicity -- a single endpoint returns all rates for a base currency, a pair conversion endpoint handles direct currency-to-currency conversion with amount calculation, and enriched data endpoints provide country flags, currency symbols, and locale information alongside rates.
With 161 supported currencies and daily updates on the free tier, it covers the vast majority of real-world conversion needs. Paid plans unlock hourly and minute-level updates.
Key strengths: 1,500 free requests/month, no credit card required, pair conversion with amount calculation, enriched data (flags, symbols), clean JSON responses, no surprise overage charges.
Pricing: Free: 1,500 req/month. Standard: $10/month (30K requests, hourly). Professional: $20/month (100K requests). Business: $40/month (300K requests).
Limitations: Daily updates on free tier, 161 currencies (fewer than OER's 170+), no time-series or fluctuation endpoints, less established track record than Fixer or Open Exchange Rates.
2. Open Exchange Rates -- The Developer Standard
Best for: Production applications needing reliable, well-documented exchange rates at scale
Open Exchange Rates is the most widely adopted currency API among developers. Shopify, Etsy, and thousands of production applications rely on it for pricing engines and multi-currency storefronts. That adoption is earned through reliability, transparent data sourcing, and developer-focused design.
The API provides hourly-updated rates for 170+ currencies, including major cryptocurrencies on paid plans. Historical rates go back to 1999 with a dedicated time-series endpoint. A currency conversion endpoint handles the math server-side, eliminating floating-point rounding issues. The documentation explains exactly where rates come from and how they are aggregated -- valuable for financial applications where audit trails matter.
Key strengths: 170+ currencies, hourly updates, historical data back to 1999, OHLC endpoint for volatility analysis, transparent data sourcing, JSONP support, proven at scale.
Pricing: Free: 1,000 req/month (USD-base only). Developer: $12/month (10K requests). Enterprise: $97/month (100K requests). Unlimited: $200/month.
Limitations: Free tier is USD-base only, no WebSocket or streaming, hourly updates are insufficient for forex trading, conversion endpoint requires paid plan.
3. Fixer -- ECB-Sourced Reference Rates
Best for: Applications requiring European Central Bank reference rates and deep historical analysis
Fixer, part of the APILayer marketplace, provides exchange rates sourced from the European Central Bank. For regulated financial applications that need ECB-published rates specifically, Fixer is one of the few APIs that explicitly sources from and attributes to the ECB.
The API covers 170 currencies with historical data back to 1999. Two analytical endpoints set it apart: time-series returns rates across a date range for charting, and fluctuation calculates rate changes and percentage changes between two dates. Fixer uses EUR as the default base currency. Paid plans unlock base currency changes and HTTPS encryption -- the free tier is HTTP-only.
Key strengths: ECB reference rates, 170 currencies, time-series and fluctuation endpoints, historical data back to 1999, bank-grade data provenance.
Pricing: Free: 100 req/month (EUR base, HTTP only). Basic: $10/month (10K requests, HTTPS). Professional: $60/month (100K requests). Business: $100/month (500K requests).
Limitations: Only 100 free requests/month, free tier is HTTP-only (no HTTPS), EUR-base only on free, steep jump from Basic ($10) to Professional ($60), inconsistent support response times reported.
4. CurrencyLayer -- Historical Data Specialist
Best for: Applications needing deep historical exchange rate data and high-frequency updates
CurrencyLayer, also part of the APILayer marketplace, provides 168 currencies with minute-level updates on higher-tier plans. While it shares infrastructure with Fixer, CurrencyLayer focuses more on rate freshness and historical depth for analytics and financial modeling.
The API provides live rates, historical rates at any past date, time-frame queries across date ranges, and a currency change endpoint that returns rate movements with percentage calculations. For fintech dashboards, portfolio tracking, and accounting systems that reconcile multi-currency transactions, this combination of breadth and freshness is valuable.
Key strengths: 168 currencies, minute-level updates on Professional plan, time-frame and currency change endpoints, historical rates at any past date, JSONP support.
Pricing: Free: 100 req/month (USD base, daily updates). Basic: $10/month (10K requests, hourly). Professional: $40/month (100K requests, minute updates). Enterprise: $80/month (500K requests).
Limitations: Only 100 free requests/month, free tier is HTTP-only and USD-base only, significant overlap with Fixer, no cryptocurrency support, shared APILayer support channels.
5. CurrencyFreaks -- Fiat and Crypto in One API
Best for: Applications that need both fiat currencies and cryptocurrency exchange rates in a single API
CurrencyFreaks distinguishes itself by covering both fiat and crypto in a unified API. Rather than calling one provider for USD/EUR and a separate crypto API for BTC/ETH, CurrencyFreaks returns them all from one endpoint. For fintech applications, portfolio trackers, and payment platforms handling both traditional and digital currencies, this eliminates multi-source aggregation complexity.
The API covers 180+ currencies with a free tier of 1,000 requests per month -- more generous than Fixer or CurrencyLayer. The conversion endpoint calculates amounts between any two supported currencies, whether USD to EUR, BTC to GBP, or ETH to JPY.
Key strengths: 180+ currencies (fiat + crypto), 1,000 free requests/month, unified conversion across fiat and crypto, currency metadata (symbols, names, country codes), simple API key auth.
Pricing: Free: 1,000 req/month. Basic: $10/month (10K requests, hourly). Professional: $30/month (100K requests). Enterprise: custom pricing.
Limitations: Smaller user base, crypto rates may lag behind dedicated providers (CoinGecko, CoinMarketCap), limited documentation, no time-series or fluctuation endpoints, no official SDKs.
6. Frankfurter -- Free and Open Source
Best for: Free exchange rates with no API key, no rate limits, and full self-hosting capability
Frankfurter is the only entry on this list that is entirely free, open source, and requires no registration. The public API needs no API key -- you make a request, you get rates. No signup, no credit card, no rate limit errors.
The data source is the European Central Bank, which publishes reference rates for approximately 33 currencies once per business day. Historical rates go back to January 1999. The time-series endpoint returns rates across any date range for charting and analysis. The entire application is open source (Ruby) and can be self-hosted for guaranteed uptime and private infrastructure.
For applications that specifically need ECB reference rates, Frankfurter provides them without the paywall that Fixer puts around the same data.
Key strengths: Completely free (no API key), no rate limits, ECB reference rates, historical data back to 1999, time-series endpoint, open source with self-hosting, CORS-enabled, HTTPS by default.
Pricing: Free. No signup, no limits, no plans.
Limitations: Only ~33 currencies (ECB-supported), no crypto or exotic currencies, daily updates only (weekdays), no SLA on public instance, no conversion endpoint, no enriched data, self-hosting requires Ruby.
How to Choose Your Currency API
Start with your use case:
| Scenario | Best Choice | Runner-Up |
|---|---|---|
| Side project or MVP | ExchangeRate-API | Frankfurter |
| Production e-commerce | Open Exchange Rates | ExchangeRate-API |
| ECB reference rates (regulated finance) | Fixer | Frankfurter |
| Historical analysis and reporting | CurrencyLayer | Open Exchange Rates |
| Crypto + fiat in one API | CurrencyFreaks | Open Exchange Rates |
| Zero cost, no signup | Frankfurter | ExchangeRate-API |
| Highest update frequency | CurrencyLayer | Open Exchange Rates |
| Self-hosted infrastructure | Frankfurter | -- |
Then consider your constraints:
- Budget. Frankfurter has no limits, ExchangeRate-API gives 1,500 free requests/month. At $10-12/month, both Open Exchange Rates and ExchangeRate-API unlock significantly more volume.
- Currency coverage. Frankfurter covers ~33 ECB currencies. For 160+, use ExchangeRate-API, Open Exchange Rates, Fixer, or CurrencyLayer. For crypto, CurrencyFreaks is the only single-API solution.
- Update frequency. Daily is fine for travel apps. E-commerce needs hourly. Financial trading needs minute-level -- and none of these APIs are suitable for high-frequency trading (use a dedicated forex data feed).
- Historical depth. Open Exchange Rates, Fixer, CurrencyLayer, and Frankfurter all go back to 1999. Fixer and CurrencyLayer add analytical endpoints that save you from computing deltas yourself.
- Reliability. Open Exchange Rates has the strongest production track record. Frankfurter's public instance has no SLA -- self-host if you depend on it.
A practical decision tree:
- Free rates with no strings? Frankfurter.
- Side project that might grow? ExchangeRate-API.
- Production reliability? Open Exchange Rates.
- ECB rates for compliance? Fixer (paid) or Frankfurter (free).
- Historical trend analysis? CurrencyLayer.
- Crypto + fiat together? CurrencyFreaks.
Methodology
This comparison is based on publicly available documentation, pricing pages, API references, and developer community feedback as of March 2026. We evaluated each provider across six dimensions:
- Free tier generosity. Request limits, feature restrictions, and credit card requirements.
- Currency coverage. Fiat, crypto, and exotic currency support.
- Data freshness. Update frequency across plans and data source transparency.
- Historical data. Date range depth and analytical endpoint availability.
- Developer experience. API design, documentation quality, and SDK coverage.
- Pricing predictability. Cost scaling, overage policies, and plan tier jumps.
We did not receive compensation from any provider listed in this article. Rankings reflect our assessment of each provider's strengths relative to developer needs.
Comparing currency APIs? Explore ExchangeRate-API, Open Exchange Rates, Fixer, and more on APIScout -- pricing, features, and developer experience across every major exchange rate provider.