What is universal-api-reference?

Universal API Reference is a large documentation project that describes the APIs of more than 3,000 different apps and services in one consistent format, covering roughly 75,000 individual endpoints. Instead of every vendor's documentation looking and behaving differently, each API here is described the same way: how authentication works, how pagination and filtering behave, what arguments each action takes, and how it maps back to the vendor's own original documentation. The motivation is that real world APIs rarely follow a single clean standard. Every company tends to invent its own pagination style, its own way of filtering and sorting results, and its own take on HTTP status codes, which makes integrating with many different services tedious. By documenting every API the same way, in one file per endpoint, this project lets you search across all of them at once, for example finding every app that supports issuing a refund, without needing to be an expert in each individual API. The content is organized by app name, alphabetically and by category such as communication, commerce, or business intelligence, with a machine readable catalog file and an llms.txt index meant for feeding into AI agents or search pipelines. This is not documentation that was scraped from other websites. It is a nightly export of the same specification that powers MindCloud's own commercial integration product, which the company says handles around 1.85 billion API calls per year, so mistakes in the docs tend to get caught and fixed quickly because they would otherwise break real customer workflows. There is no software to install here, since this is a documentation repository rather than a code library. It can be used as a plain reference when integrating directly with a vendor's API, or pointed at by an AI agent that needs quick, consistent context about how a given service works. The documentation content itself is released under the CC BY 4.0 license, which allows free reuse and adaptation as long as credit is given to the original source.