Free Public APIs

A collection of 348 Free Public APIs for Students and Developers.

Tested every single day.

Environment

APIs to help you go green—because saving the planet starts with the right data.

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🌊Global Flood API

Simulated river discharge at 5 km resolution from 1984 up to 7 months forecast.

1 Endpoint

95 API Health

🇨🇳Chinese Holiday Calendar

This API provides a comprehensive listing of public holidays in China for the year 2024. It includes the date, name of the holiday, and whether it is an off day or not.

1 Endpoint

95 API Health

🌍Carbon Intensity API

Official API for Carbon Intensity in Great Britain provided by National Grid. Allows access to current and historical carbon intensity data for different regions and time periods.

4 Endpoints

94 API Health

☁️7Timer Weather API

The 7Timer Weather API provides global numerical weather forecasts derived from high-resolution models. Users can access weather data in graphical or machine-readable formats without needing an API key, enabling programmatic access to various meteorological elements.

1 Endpoint

94 API Health

📊openSenseMap API

The openSenseMap API allows for managing users, senseBoxes (stations), and measurements, providing functionalities such as posting new data, retrieving sensor information, and managing senseBoxes. It also supports various operations with parameters for filtering and formatting responses, including JSON and CSV formats.

1 Endpoint

90 API Health

🌞Free UV Index API

Provides real-time UV Index and 5 day Hourly UV Index Forecast globally without API Key. Single endpoint for current UV Index and forecast based on latitude/longitude.

1 Endpoint

89 API Health

🏙️Hong Kong CSDI

The Hong Kong CSDI Portal provides access to a range of geospatial data and applications aimed at supporting data sharing and government initiatives. It centralizes resources for spatial data, making it easier for users to find and utilize geographic information.

1 Endpoint

85 API Health

🚀speedscale.com

Mock complex API / database dependencies and production load, modeled after real user behavior - without writing scripts.

Speedscale enables developers to record and playback realistic, sanitized production conditions on their laptop, without delays or having to search for good data.

🌍Website Carbon API

Calculates website carbon emissions per page view using real-time tests. Provides endpoints for testing and manual calculations.

1 Endpoint

40 API Health

🌍OpenAQ Platform

Largest open-source air quality data platform aggregating historical and real-time air quality data globally.

2 Endpoints

39 API Health

📬postali API REST

API REST for retrieving postal code information for Mexican addresses

2 Endpoints

20 API Health