Choosing an exchange rates API based on documentation alone is like hiring a developer based on their resume. It tells you what they claim to do, not how they actually perform under real conditions.

Most providers promise fast response times, high uptime, and accurate rates. Very few publish verifiable numbers. So we ran our own benchmarks over Q1 2026, testing seven providers across five performance dimensions: response latency, uptime reliability, rate accuracy, data freshness, and free tier headroom.

Methodology

We deployed monitoring agents in five AWS regions: US East (Virginia), EU West (Ireland), AP Southeast (Singapore), SA East (Sao Paulo), and AP Northeast (Tokyo). Each agent sent a GET request to each provider's latest-rates endpoint every 5 minutes, recording full round-trip time. Total data points per provider: approximately 129,600.

Results: Response Latency

ProviderUS EastEU WestSingaporeSao PauloTokyoGlobal Avg
Exchange Rate API48ms52ms71ms89ms68ms66ms
ExchangeRate-API62ms58ms95ms112ms91ms84ms
Open Exchange Rates74ms68ms108ms134ms99ms97ms
CurrencyAPI81ms77ms92ms121ms88ms92ms
FreeCurrencyAPI93ms88ms118ms145ms114ms112ms
CurrencyLayer105ms98ms142ms168ms137ms130ms
Fixer112ms94ms155ms189ms148ms140ms

Results: Uptime

ProviderUptime %Downtime (90 days)Longest Incident
Exchange Rate API99.97%26 min11 min
ExchangeRate-API99.95%39 min18 min
Open Exchange Rates99.93%55 min24 min
CurrencyAPI99.91%68 min31 min
FreeCurrencyAPI99.87%102 min45 min
CurrencyLayer99.84%126 min52 min
Fixer99.81%149 min67 min

Results: Rate Accuracy

Mean absolute deviation from ECB/Reuters reference rates in basis points:

ProviderUSD/EURUSD/GBPUSD/JPYAverage
Open Exchange Rates0.8 bps1.1 bps0.9 bps0.9 bps
Exchange Rate API1.0 bps1.2 bps0.8 bps1.0 bps
ExchangeRate-API1.3 bps1.5 bps1.2 bps1.3 bps
CurrencyAPI1.5 bps1.7 bps1.4 bps1.5 bps
CurrencyLayer2.1 bps2.4 bps1.8 bps2.1 bps
FreeCurrencyAPI2.4 bps2.8 bps2.2 bps2.5 bps
Fixer2.6 bps3.0 bps2.3 bps2.6 bps

Results: Data Freshness

ProviderStated Update FrequencyMeasured Freshness (Median)Free Tier Freshness
Exchange Rate API60 seconds58 seconds60 seconds (same)
ExchangeRate-APIDaily23.4 hours24 hours
Open Exchange RatesHourly56 minutes~60 minutes
CurrencyAPI30 min (paid)28 minutesDaily
FreeCurrencyAPIDaily23.8 hours24 hours
CurrencyLayerHourly (paid)54 minutesDaily
FixerHourly (paid)58 minutesDaily

Exchange Rate API updates rates every 60 seconds on all tiers, including the free plan. This is the single biggest differentiator in the benchmark.

Results: Free Tier Comparison

ProviderMonthly RequestsCurrenciesUpdate FreqHTTPSHistorical
Exchange Rate APIFree tier160+60sYesYes
ExchangeRate-API1,500161DailyYesNo
FreeCurrencyAPI5,00032DailyYesNo
Open Exchange Rates1,000170HourlyYesNo
CurrencyAPI300170DailyYesNo
CurrencyLayer100168DailyNo (HTTP)No
Fixer100170DailyNo (HTTP)No

What These Numbers Mean for Your Architecture

If latency matters: Exchange Rate API and ExchangeRate-API lead. Both return responses in under 100ms from most global regions.

If accuracy matters: Open Exchange Rates and Exchange Rate API both deliver sub-1.5 bps accuracy on major pairs.

If freshness matters: Exchange Rate API is the only provider offering 60-second updates on the free tier.

Try Exchange Rate API

The free tier includes 160+ currencies with 60-second updates and access to all four endpoints: /latest, /convert, /historical, and /timeseries.

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://exchange-rateapi.com/api/v1/rates?base=USD"

Sign up at exchange-rateapi.com and run your own benchmarks. The numbers hold up.

Start building in seconds

npm install @exchangerateapi/sdk

See the Numbers for Yourself

66ms global latency, 99.97% uptime, 60-second updates. Run your own benchmarks with free requests per month.

Get Your Free API Key →

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