APILayer

APILayer is an API marketplace that gives you a set of data APIs under one account and one key. The catalog covers finance, aviation, geolocation, search, media and weather.

APILayer lets you sign up once and use a single API key across its catalog. Each API is documented and called with plain HTTP requests, and the platform aims for consistent authentication across all of them. Examples in the catalog include an IP geolocation API, a stock market data API, a flight data API and a search results API. You can start with the API you need and add more later without a new account or billing setup. The company says it provides managed infrastructure for its paid plans.

• Use one API key for the whole catalog of APIs
• Get aviation, geolocation, stock market and search data
• Start on a free plan with no card needed
• Add more APIs to the same account later
• Read clear documentation with consistent authentication

Developers and startups that need external data for a product will find it useful. Data product teams that want several data sources under one account can also use it to reduce setup work.

You can start for free without a credit card. Paid plans are offered for higher usage, and the site describes faster updates and support for paying customers. Check each API's own limits and terms, since the free allowance differs by API and plan.