What Is an XML-RPC API and Why SaaS Teams Use Them

XML-RPC APIs, originating in 1998, are a type of API that facilitate data exchange via remote procedure calls using XML as the transport language and HTTP as the transfer protocol, making them distinct from REST APIs. They are known for having a single endpoint, which can simplify management compared to REST APIs with multiple endpoints. XML-RPC is not limited to standard CRUD operations, allowing for easier execution of remote functions, and is particularly used in scenarios where managing numerous endpoints would be cumbersome, as seen with applications like Odoo's SaaS app. Despite being less common today compared to other API types, XML-RPC APIs maintain a niche for executing non-CRUD procedures and are supported by most programming languages, including PHP, Python, and Perl. They require POST requests and can utilize various authentication methods such as API keys and OAuth 2.0. While they are not as prevalent in modern web applications, XML-RPC APIs remain relevant for specific use cases where their streamlined structure and flexibility in remote function execution offer advantages over more conventional web API types.