65 Popular APIs & Free Alternatives List - May, 2024 | RapidAPI (2024)

FAQs

What APIs are free to use? ›

REST APIs are the most common type of protocol, while GraphQL is a newer type of protocol that allows for more efficient and targeted data retrieval. SOAP, RPC, and webhook API protocols also each have their place.

Sign up for a free RapidAPI account

You begin by signing up for a free RapidAPI account, assuming you don't already have one. An account is required to test APIs, integrate them into your application, and track analytics. Sign up from the RapidAPI home page by clicking the Sign Up button in the top right.

API stands for Application Programming Interface. In the context of APIs, the word Application refers to any software with a distinct function. Interface can be thought of as a contract of service between two applications. This contract defines how the two communicate with each other using requests and responses.

The Google Maps API and Twitter API may be among the most widely used API examples, but most software-as-a-service (SaaS) providers offer APIs that let developers write code that posts data to and retrieves data from the provider's site as well.

All use of Google Search Console API is free of charge.

Freemium: In this model, developers have access to a basic API for free up to a certain threshold and transition to pay-per-use in a tiered pricing model when they exceed that line. This model is one of the most popular for monetized public APIs since it encourages wide adoption of the “free” API.

When you first sign up for the API, you are on the “free tier.” You can think of this as tier zero as each tier after this one is numbered from one through five. The most important number right now is the usage limits. You cannot spend more than $100 a month when you start out with ChatGPT.

What are the most common API calls? ›

The most common types of APIs are REST APIs which use HTTP-based API call methods. The most common methods are GET,POST, PUT, DELETE, and BATCH.

All use of Google Search Console API is free of charge. However, it is subject to usage limits. Was this helpful? Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License.

For HTTP APIs and REST APIs, you pay only for the API calls you receive and the amount of data transferred out. There are no data transfer out charges for Private APIs. However, AWS PrivateLink charges apply when using Private APIs in API Gateway.

“Free tier” is if you were granted API credits through a promotion or trial. OpenAI is no longer giving any credits to pay for use simply for those that sign up. You will need to prepay for credits in order to use the API services, which are billed by the amount of language data used.