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

# Indexer

In addition to the [subgraph](https://thegraph.com/legacy-explorer/subgraph/ourzora/zora-v1) on Graph Protocol, Zora maintains its own indexer that serves a GraphQL API full of useful information about the Zora protocol and the entire NFT universe. 

The Indexer watches the Zora Media, Market, and Auction House contracts as well as a set of arbitrary ERC-721 contracts. Indexer also regularly fetches and refreshes ERC-721 metadata json data, so clients can query NFTs by their metadata properties. Currently Indexer only watches Ethereum networks, but is extensible to include other EVM networks.

Begin making example queries in our hosted GraphQL [**playground**](https://ourzora.github.io/indexer-playground/) on both Rinkeby and Mainnet.