Developer guide/Exchange rate APIs on Reddit

What developers ask about exchange rate APIs on Reddit

Five Reddit discussions reveal the operational questions behind exchange-rate API recommendations, followed by a quick map of the providers developers mention.

ERexchangerate.dev·Jul 1, 2026·9 min read

The useful signal in Reddit is not a permanent winner. It is the requirements that keep returning: no-key evaluation, dependable history, clear freshness, predictable quotas, and a plan for the day a free dependency disappears.

This page starts with the requirements behind the recommendations. For a scored provider ranking based on quota, intraday freshness, closed-market labeling, history, conversion, and agent support, read the dimension-by-dimension comparison, or see 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.

A quick map of the named sources

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

Nine 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	exchangerate.dev	Developer API	Free tier	Intraday FX + freshness metadata + MCP
3	ExchangeRate-API.com	Developer API	Freemium	Broad currency list
4	Open Exchange Rates	Developer API	Freemium	Mature API, 200+ currencies
5	Fixer.io	Developer API	Freemium	ECB-based data via apilayer
6	CurrencyAPI / currencylayer	Developer API	Freemium	170+ currencies, clean JSON
7	ECB (European Central Bank)	Reference source	Free (raw)	Authoritative daily reference
8	Wise	Consumer / payments	Limited	Real mid-market for transfers
9	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. 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.

3. 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.

4. 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.

5. 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.

6. CurrencyAPI / currencylayer

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

7. 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.

8. 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.

9. 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

Reddit does not produce one stable ranking. The useful signal is in the requirements that repeat across discussions: whether a feed needs a key, how dependable it is, whether history comes as a range, how often rates update, and what happens when a free source disappears. These representative threads show those needs directly:

Keyless API reliability discussion (r/webdev, 2025) — free access without a key, data reliability, and the coverage trade-off of ECB-based feeds
What happens when a free feed disappears (r/webdev, 2024) — provider durability, caching, fallbacks, and the operational cost of a keyless dependency
Live and historical range requirements (r/webdev, 2018) — up-to-date rates plus historical time ranges that can be charted without many separate calls

FAQ

What is the best free exchange rate API for developers?

It depends on what your project needs. 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. 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?

There is no stable Reddit consensus. Developers weigh free access, broader coverage, intraday updates, and historical ranges differently. Recurring concerns include free-source reliability, base-currency limits, caching and fallbacks, and rate freshness. The representative threads linked below show those trade-offs; the ranking above is this guide’s comparison, not a Reddit vote.

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 seven tools (start_checkout, list_currencies, get_rate, get_usd_index, convert, get_range, search_docs) on every plan, including Free, so agents in Claude, Cursor, and ChatGPT can query rates and USD indices directly. Checkout requires explicit human confirmation; 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 →