🔌 World Public API Directory
Discover 19 free public APIs across 52 categories
Showing 1–19 of 19 APIs
| API ▲ | Description | Category | Auth | HTTPS | CORS |
|---|---|---|---|---|---|
| 1ClickImpact | Environmental impact API for tree planting, carbon offsetting and ocean cleanup | Environment | API Key | ✅ | yes |
| Air Quality Index | Real-time air quality data including AQI and pollutant concentrations for worldwide locations | Environment | Open | ✅ | unknown |
| BreezoMeter Pollen | Daily Forecast pollen conditions data for a specific location | Environment | API Key | ✅ | unknown |
| Carbon Interface | API to calculate carbon (C02) emissions estimates for common C02 emitting activities | Environment | API Key | ✅ | yes |
| Climatiq | Calculate the environmental footprint created by a broad range of emission-generating activities | Environment | API Key | ✅ | yes |
| Cloverly | API calculates the impact of common carbon-intensive activities in real time | Environment | API Key | ✅ | unknown |
| Danish data service Energi | Open energy data from Energinet to society | Environment | Open | ✅ | unknown |
| GrünstromIndex | Green Power Index for Germany (Grünstromindex/GSI) | Environment | Open | ❌ | yes |
| IQAir | Air quality and weather data | Environment | API Key | ✅ | unknown |
| Luchtmeetnet | Predicted and actual air quality components for The Netherlands (RIVM) | Environment | Open | ✅ | unknown |
| National Grid ESO | Open data from Great Britain’s Electricity System Operator | Environment | Open | ✅ | unknown |
| OpenAQ | Open air quality data | Environment | API Key | ✅ | unknown |
| PM2.5 Open Data Portal | Open low-cost PM2.5 sensor data | Environment | Open | ✅ | unknown |
| PVWatts | Energy production photovoltaic (PV) energy systems | Environment | API Key | ✅ | unknown |
| Srp Energy | Hourly usage energy report for Srp customers | Environment | API Key | ✅ | no |
| Thames Water Open Data | Open Data from the UK's largest water and wastewater services company | Environment | API Key | ✅ | unknown |
| UK Carbon Intensity | The Official Carbon Intensity API for Great Britain developed by National Grid | Environment | Open | ✅ | unknown |
| WattBuy | Electricity usage estimations, carbon footprint estimations, and utility data | Environment | API Key | ✅ | yes |
| Website Carbon | API to estimate the carbon footprint of loading web pages | Environment | Open | ✅ | unknown |