top of page

11 December 2023

8 Min. Read

API Testing

Top 10 Popular API Examples: A Complete List

Top 10 Popular API Examples: A Complete List

Key Highlights

In this blog, we cover following key highlights

  1. Get to know about what is an API?

  2. Learn about how to use an API

  3. Learn about the most popular APIs of all time with our API examples

  4. API examples will tell you the usage of APIs in various sectors

It's hard, expensive, and time-consuming to build your own API test suite. This whitepaper shows how to create a rigorous, no-code API testing suite that catches all major bugs before release.

In the digital era we live in today, APIs have emerged as pivotal elements in the software development landscape.


Imagine a bustling city where each building represents a different software application. Just as a city's infrastructure connects these buildings through roads, bridges, and public transportation, APIs interlink these software applications, allowing them to communicate and share data seamlessly.

APIs define the rules for how software components should interact, much like how traffic signals regulate the flow of vehicles on the roads. This set of rules ensures that even if the internal workings of a software application are complex and intricate, the way it communicates with the outside world remains standardized and straightforward.


This article is all about explaining the meaning of an API in the simplest manner, following which we’ll explore the ten most widely used APIs and their usage, providing insightful API examples.


What is an API?

An API, or Application Programming Interface, is a crucial component in the world of software development. To understand what an API is, let's explore both technical and non-technical perspectives.


Technical Perspective:

From a technical standpoint, an API is a set of protocols, routines, and tools for building software applications. It specifies how software components should interact, including the kinds of calls or requests that can be made, how to make them, the data formats that should be used, and the conventions to follow. Essentially, it's a contract between different software components on how to communicate with each other, where the "terms" of the contract are defined by the functions and methods that developers can call.


APIs are often used to enable the integration between different systems. For instance, a web API can allow a web server to interact with third-party services or clients like browsers. It plays a crucial role in the development of applications that leverage services like cloud computing, mobile app development, and platform as a service.


Non-Technical Perspective:

To understand APIs in a non-technical way, think of an API as a waiter in a restaurant. When you sit down to eat, you have a menu with choices of what to order. The kitchen is the system that will prepare your order. What's missing is the link to communicate your order to the kitchen and then to deliver your food back to your table. That's where the waiter, or the API, comes in. The waiter takes your order, communicates it to the kitchen, and then brings your food back to you. In this analogy, the menu is the documentation of the API, telling you what requests you can make.


In this sense, an API simplifies complex processes by providing a ready-to-use interface. You don't need to know how the kitchen works to get your meal, just as you don't need to know the inner workings of a software component to use its functionalities. The API handles all the behind-the-scenes work.


How To Make Use Of An API?

Using an API might sound complex, but it can be quite straightforward. Here’s a simple, step-by-step guide to help you understand how to make use of an API, accompanied by practical API examples to demonstrate each step.


Step 1: Choose the Right API for Your Needs

  • Identify Your Requirement: What do you want to achieve? For example, do you want to add weather information to your website, or are you looking to process payments?

  • Look for an API that fits your requirement. There are many public APIs available for different purposes, like Google Maps for location services or Stripe for payment processing.


Step 2: Understand the API Documentation

  • Read the Documentation: Once you've chosen an API, read its documentation. This is like reading the instruction manual. It will tell you how to connect to the API, what requests you can make, and the format of responses you will receive.

  • Look for the base URL of the API, authorization requirements, request format, and the structure of responses.


Step 3: Get the Necessary Credentials

  • Register or Sign Up: Many APIs require you to create an account and get an API key. This key is like a unique ID that identifies your requests to the API.

  • Treat your API key like a password. Don’t share it publicly.


Step 4: Make a Test API Call

  • Use API Tools: You can use tools like Postman or even a simple code snippet in a language like Python to make a test API call.

  • Follow the examples in the API documentation to make a basic request. This could be something like fetching current weather data from a weather API.


Step 5: Handle the API Response

  • Check the Response: When you make a request, the API will respond with data. This is usually in a format like JSON or XML.

  • Use the data in your application. For instance, you might display the weather data on your website or use payment information to confirm a purchase.


Step 6: Integrate the API into Your Application

  • Coding: Use your programming skills to integrate the API into your application. This means writing code that sends requests to the API and handles responses.

  • Test thoroughly to ensure that the API is integrated properly and works as expected within your application.


Step 7: Monitor and Maintain

  • Keep an Eye on API Usage: Monitor how your application is using the API. Ensure you're not exceeding usage limits.

  • APIs can change. Keep an eye on any updates or changes to the API and update your application as needed.

Build API tests without writing or maintaining scripts

Set up an API testing suite in a day!

What are APIs Used For?

APIs are like the versatile tools in a digital toolbox, each designed for specific tasks but collectively transforming the way we interact with technology. Their uses are as varied as the needs of the users and developers who employ them. We'll explore some common scenarios and provide real-world API examples to illustrate their applications.


  • Data Sharing and Connectivity

  • Enhancing User Experience

  • E-commerce and Online Payments

  • Social Media Integration

  • Automation of Tasks

  • Personalization of Content

  • Healthcare and Telemedicine


10 API Examples of Popular Apps

APIs have revolutionized how software applications communicate and function, offering diverse capabilities and conveniences. Here, we delve deeper into some of the most prominent APIs in the tech world, highlighting their unique features and the trends they are setting in the industry.


For this section of API examples, we will use a mix of all time most popular APIs along with the widely used APIs of 2023. Let’s dive deep and have a better understanding of these APIs showcasing practical API examples to highlight their functionalities and significance in the tech ecosystem.


1. Notion API

Fork: 50k+

  • Notion API is a gateway to integrating with Notion's all-in-one workspace. It provides endpoints for reading, updating, creating, and deleting data, allowing developers to build custom workflows and connect Notion with other apps.

  • It stands out for its flexibility in handling various data types — from text and images to databases. It's particularly popular for automating content management and enhancing collaborative workspaces.

  • The rise in remote work and digital collaboration has led to a surge in demand for tools like Notion, and its API plays a critical role in this ecosystem.


2. ChatGPT API

  • This API provides access to advanced language models capable of understanding and generating human-like text, making it ideal for chatbots, content creation, and language analysis tasks.

  • The API is at the forefront of leveraging deep learning for natural language processing, offering unprecedented accuracy in understanding context and nuances in language.

  • As businesses seek to improve customer engagement and automate communication, ChatGPT’s API is becoming a go-to solution for its versatility and advanced capabilities.


3. WhatsApp API

Fork: 50k+

  • This API allows businesses to automate, sort, and quickly respond to messages. It’s designed for medium and large businesses to provide customer support and deliver notifications.

  • The API enables businesses to reach customers on a platform they use daily, making interactions more personal and efficient.

  • With the growing emphasis on personalized customer service, WhatsApp API is increasingly being adopted for its convenience and wide reach.


4. Google Maps API

Fork: 20k+

  • It offers extensive capabilities in mapping, location, and route planning. Developers can embed maps, create custom overlays, and extract location data for their applications.

  • The API has evolved to include features like real-time traffic updates, street view, and detailed location data, making it indispensable for location-based services.

  • The API is crucial for businesses focusing on delivery services, travel, and real estate, where accurate geographical information is key.


5. Stripe API

Fork: 20k+

  • Stripe’s API stands out for its robust, secure, and easy-to-integrate payment processing capabilities. It supports a wide range of payment methods and currencies.

  • It continuously adds new features like machine learning-based fraud detection, making online transactions safer and more reliable.

  • The growth of e-commerce and online marketplaces has made APIs like Stripe more critical than ever, offering businesses a scalable payment solution.


6. GitHub API

  • This API allows programmatic access to GitHub’s vast repository platform. It enables automation of workflows, repository management, and integration of GitHub with other tools.

  • It supports a collaborative development environment, making it easier for developers to contribute to projects, track issues, and manage changes.

  • With the rise of open-source and collaborative projects, the GitHub API has become a staple in the developer community for streamlining software development processes.


7. Slack API

Fork: 50k+

  • Slack's API lets developers build custom integrations and bots, enhancing communication within teams. It can automate tasks, send notifications, and sync with other business tools.

  • The API has been instrumental in creating more interactive and productive workplace environments, allowing for seamless integrations with various business tools.

  • As remote work becomes more prevalent, APIs like Slack’s are vital in creating an interconnected digital workplace.


8. PayPal API

Fork: 50k+

  • It offers a broad range of functionalities for processing online payments, including direct payments, recurring payments, and payment tracking.

  • The API provides a secure and user-friendly way to handle transactions, vital for building trust in e-commerce platforms.

  • With the global increase in online shopping, the PayPal API plays a crucial role in facilitating secure and convenient transactions across borders.


9. Discord API

  • It enables the creation of custom bots and integrations to enhance user interaction on the Discord platform, popular in gaming and community-building.

  • The API allows for a high degree of customization, fostering a diverse range of community-driven features and integrations.

  • As community-driven platforms gain popularity, APIs like Discord’s are crucial in providing the necessary tools for community engagement and management.


10. Twilio API

Fork: 2k+

  • Twilio’s API specializes in embedding communication services like voice, SMS, and video into applications. It is known for its scalability and reliability.

  • The API has been pioneering in making communication more programmable and versatile, adapting to various business needs.

  • In a world where timely and multi-channel communication is key, Twilio’s API has become indispensable for businesses looking to connect with customers in personalized ways.


Need of API Testing

API testing is not just about checking if an API works; it's about ensuring that it works correctly, securely, reliably, and quickly.


As the use of APIs continues to grow in software development, the importance of thorough API testing becomes increasingly paramount. It's a fundamental process that supports the creation of high-quality, robust, and secure software applications.


👉Early Problem Detection

👉Ensure Contract Compliance

👉Security Assurance

👉Performance Verification

👉Reliability and Stability

👉Integration and End-to-End System Testing

👉Compliance with Regulations


Simplifying API Testing with HyperTest

HyperTest makes API testing incredibly straightforward and effective. It's a popular choice among various companies, such as Nykaa, PayU, Porter, Urban Company, and Fyers, thanks to its user-friendly, codeless approach to test automation. This innovative tool diligently tracks down bugs and errors, ensuring they are addressed before your software goes live.


👉The way HyperTest works is by keeping an eye on your network traffic. This method is highly efficient because it automatically covers a wide range of testing scenarios that might otherwise be missed.


👉One of the standout features of HyperTest is its 'record and replay' technique. This approach is not only easy to set up but also exceptionally effective, especially for regression testing of apps.


For the Quality Assurance (QA) team, this means a significant reduction in workload, as the tool does most of the heavy lifting, ensuring thorough testing with minimal effort.


Interested to see how HyperTest catches bugs in your software too? See it live here.

Frequently Asked Questions (FAQs)

1. What are APIs used for?

APIs serve as bridges between different software, allowing them to exchange data and functionality. They enable developers to integrate services, access features, and build upon existing applications, fostering connectivity and innovation in the digital realm.

2. Why are APIs important?

APIs are crucial because they facilitate seamless communication between diverse software systems. They enable developers to access and leverage functionalities from various applications, fostering integration and interoperability. APIs play a pivotal role in driving innovation, allowing the creation of diverse and interconnected digital experiences across platforms and services.

3. What are common APIs?

Common API examples include social media APIs like Facebook Graph API, payment gateways like Stripe API, and mapping APIs like Google Maps API. Additionally, web development often involves RESTful APIs, such as those provided by GitHub. These interfaces empower developers to integrate functionalities like social sharing, online payments, and mapping services into their applications.
bottom of page