> For the complete documentation index, see [llms.txt](https://x-chain-1.gitbook.io/x-chain/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://x-chain-1.gitbook.io/x-chain/block-explorer.md).

# Block Explorer

* X-Chain Scan is more than just a block explorer. It contains useful resources that developers can leverage for their dapps, such as the PostgreSQL database layer, GraphQL server and smart contract APIs.
* X-Chain chain data Most apps require a fast and efficient data source for things that are not easily available over raw blockchain RPC, for example:

Balances of all tokens that a user has list of token holders for a particular coin history of token trades on a DEX history of user’s interaction with a smart contract X-Chain Scan offers 3 solutions for various use cases:

* GraphQL server for web apps PostgreSQL database for advanced apps and data analysis HTTP API for developers.
* See All blocks and transactions. Interact with your contracts. Decode functions, events, and variables data.