Freemium
ReqRes
Free hosted REST API for testing and prototyping with real responses
Public APIsHosted test REST API
Alternatives to API Ninjas
12 tools like API Ninjas, chosen by what they do. About API Ninjas
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ExchangeRate-API
Currency exchange rate API for 165 currencies with a free plan
Public APIsCurrency conversion API
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APILayer
Marketplace of 40+ APIs for finance, weather, geolocation and data
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Open-Meteo
Free weather forecast and historical weather API with no API key
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Alpha Vantage
Stock market, forex and crypto data API with a free API key
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JSONPlaceholder
Free fake REST API with six resources and no signup required
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httpbin
Simple HTTP service that echoes requests and returns test responses
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Open source
Curated
REST Countries
Country data API with 250+ countries and 90+ fields per record
Public APIsCountry data over REST
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Frankfurter
Free exchange rate API for 219 currencies, with history back to 1948
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OpenWeather
Weather, forecast and air quality APIs with a free daily tier
Public APIsWeather data and forecasts