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

# Introduction

- [Quick start guide to WatchData!](https://docs.watchdata.io/introduction/quick-start-guide-to-watchdata.md): Quick start guide to WatchData! Learn how to create a key, make your first request and get to building!
- [Why Use WatchData?](https://docs.watchdata.io/introduction/why-use-watchdata.md): WatchData provides a comprehensive developer platform for your dApps on the Ethereum and others popular Blockchains.
- [Supported chains](https://docs.watchdata.io/introduction/supported-chains.md): List of chains supported by WatchData
- [Error Reference](https://docs.watchdata.io/introduction/error-reference.md): Learn about the standard JSON-RPC error codes.
- [Change Log (update)](https://docs.watchdata.io/introduction/change-log-update.md): Records of all notable changes made to WatchData.