Open-Meteo
WeatherOpen weather and climate data API with no API key required for common requests.
- Auth
- None
- Pricing
- Free
Use cases
- • Forecast dashboards
- • Travel apps
- • Agriculture tools
API directory
Useful public APIs and developer services
A practical directory of public APIs with transparent pricing, auth expectations, and informed use cases.
The Cat API
Developer utilitiesLightweight API for testing, demos, placeholder assets, and playful frontend experiments.
- Auth
- None
- Pricing
- Free
Use cases
- • Demo apps
- • Mock UIs
- • Frontend prototypes
REST Countries
GeographyCountry metadata API for flags, codes, region info, and geographic data lookups.
- Auth
- None
- Pricing
- Free
Use cases
- • Forms
- • Address validation
- • Regional filters
OpenAlex
EducationScholarly metadata service covering papers, institutions, authors, and research topics.
- Auth
- None
- Pricing
- Free
Use cases
- • Research tools
- • Academic apps
- • Knowledge graphs
CoinGecko
FinanceCryptocurrency market data API widely used for portfolio, exchange, and market insights.
- Auth
- API key optional
- Pricing
- Free tier
Use cases
- • Finance dashboards
- • Tracking apps
- • Market widgets