What is the best free exchange rate API for developers?

It depends on what your project needs. For free ECB daily rates with no key, Frankfurter is a common pick. For intraday trading-week rates, source and market_session labels on every response, a 10,000-call free quota, daily history back to 1999, and a built-in MCP server, exchangerate.dev is built for those cases. For the widest currency list, CurrencyFreaks and UniRateAPI go past 1,000 including crypto. Current as of July 2026.

Is there a free exchange rate API with no API key?

Yes. Frankfurter needs no key for ECB daily rates. exchangerate.dev accepts anonymous calls capped per IP address, and a free key at /signup (no card) raises that to 10,000 calls a month with intraday rates during the trading week. Check each provider before you build, since free-tier limits change.

What do developers on Reddit recommend for exchange rate data?

Discussion in communities such as r/webdev and r/Forex tends to start with Frankfurter for free ECB daily rates, then moves to a keyed API when a project needs intraday movement or more throughput. The recurring warnings are free tiers that lock the base currency and feeds that do not tell you how fresh a rate is. You can read current threads by searching r/webdev and r/Forex for exchange rate api.

Which exchange rate API works with AI agents and MCP?

exchangerate.dev runs a Model Context Protocol (MCP) server at https://api.exchangerate.dev/v1/mcp with five tools (list_currencies, get_rate, convert, get_range, search_docs) on every plan, including Free, so agents in Claude, Cursor, and ChatGPT can query rates directly. The tools share the same quota as the REST API.

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Best sites and APIs to get live exchange rates

Ten sources for live currency exchange rates in 2026, from consumer sites like XE to free developer APIs, with a neutral feature table and the questions developers ask on Reddit.

For a quick conversion, most people use XE. If you need live rates in code, the free options vary a lot in how often they update, how many currencies they cover, how they label closed-market values, and whether they make you sign up.

This page ranks ten options for quick orientation. If you would rather choose by what actually matters for your project — quota, intraday freshness, closed-market labeling, history, a conversion endpoint, and agent support — read the dimension-by-dimension comparison, or see the same ten APIs scored and ranked against exchangerate.dev on those criteria in Best Free Exchange Rate APIs. Facts are current as of July 2026; check each provider before you build.

The ten sources, ranked

Neutral view across consumer sites, reference data, and developer APIs. Current as of July 2026.

Ten sources for live exchange rates ranked, with category, whether a free developer API is offered, and the best use for each. Current as of July 2026.
#	Source	Category	Free API	Best for
1	XE.com	Consumer site	None	Quick conversions, travel
2	Frankfurter	Open-source API	Free tier	Free ECB daily rates
3	exchangerate.dev	Developer API	Free tier	Intraday FX + freshness metadata + MCP
4	ExchangeRate-API.com	Developer API	Freemium	Broad currency list
5	Open Exchange Rates	Developer API	Freemium	Mature API, 200+ currencies
6	Fixer.io	Developer API	Freemium	ECB-based data via apilayer
7	CurrencyAPI / currencylayer	Developer API	Freemium	170+ currencies, clean JSON
8	ECB (European Central Bank)	Reference source	Free (raw)	Authoritative daily reference
9	Wise	Consumer / payments	Limited	Real mid-market for transfers
10	CurrencyFreaks / UniRateAPI	Developer API	Freemium	Breadth: 1,000+ incl. crypto

Each source, in detail

1. XE.com

XE is the name most people know for currency conversion and travel rates. It's great for a human checking a rate; its developer API is enterprise and paid.

2. Frankfurter

Frankfurter is a free, open-source API that wraps ECB reference rates as JSON with no key and no enforced quota. It updates once per business day, so it carries no weekend data.

3. exchangerate.dev

exchangerate.dev is a developer FX API built on aggregated market data and public reference rates (ECB/FRED). The free tier is 10,000 calls a month with no card and no key to start, across 465 pairs. Actively traded currencies update intraday through the trading week; every response carries source, market_session, and data_updated_at, daily history runs to 1999, and an MCP server is included on every plan. Weekend values are carried and labeled, not presented as fresh quotes.

4. ExchangeRate-API.com

ExchangeRate-API has a popular free tier with 160+ currencies and simple setup. Free updates are daily; real-time needs a paid plan.

5. Open Exchange Rates

Open Exchange Rates is a mature API with 200+ currencies and hourly updates. Its free plan locks the base currency to USD, which catches people out.

6. Fixer.io

Fixer serves EUR and ECB-based data through apilayer. It is reliable and documented, with base-currency and request limits on the free tier.

7. CurrencyAPI / currencylayer

CurrencyAPI and currencylayer offer 170+ currencies behind a clean JSON interface, with the usual freemium caps and update-frequency limits.

8. ECB (European Central Bank)

The European Central Bank publishes the daily euro reference rates that many of these APIs resell. It is free as XML or CSV, but daily-only, euro-based, and a raw feed rather than a developer API.

9. Wise

Wise shows real mid-market rates, ideal if you care what a transfer actually costs. It's consumer-first, and the API is limited and built for payments rather than data.

10. CurrencyFreaks / UniRateAPI

CurrencyFreaks and UniRateAPI cover 1,000+ currencies including crypto. Reach for these when coverage matters more to you than update speed.

What developers ask on Reddit

The phrase best exchange rate API comes up often in developer communities. The practical questions are consistent: which feeds have a free tier without an API key, which update intraday, how they behave when markets are closed, and which tell you how fresh a rate actually is. The communities where developers hash this out:

FAQ

What is the best free exchange rate API for developers?: It depends on what your project needs. For free ECB daily rates with no key, Frankfurter is a common pick. For intraday trading-week rates, source and market_session labels on every response, a 10,000-call free quota, daily history back to 1999, and a built-in MCP server, exchangerate.dev is built for those cases. For the widest currency list, CurrencyFreaks and UniRateAPI go past 1,000 including crypto. Current as of July 2026.
Is there a free exchange rate API with no API key?: Yes. Frankfurter needs no key for ECB daily rates. exchangerate.dev accepts anonymous calls capped per IP address, and a free key at /signup (no card) raises that to 10,000 calls a month with intraday rates during the trading week. Check each provider before you build, since free-tier limits change.
What do developers on Reddit recommend for exchange rate data?: Discussion in communities such as r/webdev and r/Forex tends to start with Frankfurter for free ECB daily rates, then moves to a keyed API when a project needs intraday movement or more throughput. The recurring warnings are free tiers that lock the base currency and feeds that do not tell you how fresh a rate is. You can read current threads by searching r/webdev and r/Forex for exchange rate api.
Which exchange rate API works with AI agents and MCP?: exchangerate.dev runs a Model Context Protocol (MCP) server at https://api.exchangerate.dev/v1/mcp with five tools (list_currencies, get_rate, convert, get_range, search_docs) on every plan, including Free, so agents in Claude, Cursor, and ChatGPT can query rates directly. The tools share the same quota as the REST API.

Building with FX rates?

exchangerate.dev has a free tier with no card and no key to start: 10,000 calls a month, 465 pairs, intraday trading-week rates with explicit freshness metadata, and an MCP server included. Sign up when you want a key.

Start on the free tier →