> For the complete documentation index, see [llms.txt](https://docs.holder.xyz/holder-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.holder.xyz/holder-api/readme.md).

# Overview

Welcome to the Holder API documentation! This is a work in progress, and we'll have a lot more coming soon. For now you should be able to find some general authentication and security docs, as well as a few simple APIs to get started modifying contacts in the system. Pretty much all of our APIs use `Content-Type: application/json`, so be sure to `JSON.stringify()` your request body (or language/tool specific method if not using JavaScript).