What Are the 4 Types of API?

There are three types of APIs: RPC, SOAP, and REST. The first is a server-side API, usually implemented in a web server. The second is a client-side API, traditionally implemented in software that accesses the server. Finally, the third type of API is a composite API, a combination of RPC and SOAP.


Unlike traditional APIs, REST APIs allow you to create and control your resources. You can also use them to exchange data with other applications.

REST APIs are built on the client-server model, which provides maximum flexibility. They can handle virtually any access request. And they make integrations scalable. This allows for quick and easy development.

REST APIs are built with data caching in mind. This reduces server load and allows for faster page loads. They also allow you to reuse data.

You can use REST APIs to access various resources, such as web pages, blog posts, videos, and images. REST APIs also allow you to send status messages. These messages are self-descriptive, making them easy to understand.

REST APIs use Hyper-Text Transfer Protocol (HTTP) to communicate with other servers. They can also use an application program interface (API) key to delivering code to run on the client. Live video chat API keys allow using you to create a base64-encoded username: password string.

Consider building your REST API with a stateless interface. This allows you to send code to the client only when necessary. Again, this improves the odds of a successful response.

Consider using a layered architecture to optimize scalability. This is especially important if you’re dealing with large data transfers.


Using SOAP APIs can help you provide messaging apps with reliable communication. Its flexibility makes it a good fit for various environments. It can be used in any programming language and with different operating systems. In addition, its built-in error-handling mechanism helps you keep track of errors and return responses.

Using SOAP APIs can help you make any data available. It can also be applied to different media, networks, and content. It uses HTTP as the transport but can also leverage other protocols. The most common data formats used with SOAP include JSON and XML.

Using SOAP APIs can also help you integrate caching into your application. This can reduce load time and increase scalability. In addition, it can help you avoid adding extra server resources.

SOAP is also known to be more secure than JSON. It can help you provide ACID-compliant transactions. It is also very flexible when moving data. Using this protocol can also help you keep track of errors in your requests.

The SOAP API is designed to be a good fit for a distributed enterprise. It is also highly standardized. It is often the first choice for non-HTTP communication protocols. This is because it offers a high level of security and the ability to handle legacy environments.


The RPC API is a set of standards that defines how an interaction will be handled between a client and server. For example, the client requests a service, and the provider program responds. Several sections in the RPC API define the rules for interaction.

The RPC API also defines the data types used in function calls. These data types include primitive unsigned integer types and other defined types. The data types are described in RPC API data type descriptions.

A function call is a function that a client calls. Typically, this call will take two parameters. The first parameter is the name of the attribute to retrieve. The second parameter is a pointer to a variable where the parameter’s value will be stored.

Alternatively, you can call a function by passing a binding handle, a pointer, to an opaque data type. The crucial handle can be a client or server binding handle. The client’s local operating system passes incoming packets to the server’s stub, which unpacks and serializes the parameters into a message. The stub then calls the server procedure, which generates a response.

The RPC API also contains functions that can be used to modify replies. These functions can add or remove parameters, change the value returned, or return a different response. In addition, some parts can retrieve and format the value returned by the API.

Composite APIs

Having a composite API allows you to save time and resources. This can improve listeners’ performance in web interfaces, reduce the load on your server, and make your system faster.

A composite API can be either public or private. Consider your use cases and determine which type of API you need. For example, a public API can be called from any web page, but authenticated users can only access a private API.

Composite APIs are a helpful tool for retrieving data from many different services. For example, you may need to retrieve information from various web services to create a new customer in your eCommerce application. A composite API allows you to combine other data APIs and receive a single response. This is useful when performing multiple API calls in a rapid sequence.

Composite APIs are based on REST. REST is a lightweight and scalable web API. You can access data from web services using a REST API using HTTP requests. REST is also a popular protocol for client-server interactions with web applications.