> For the complete documentation index, see [llms.txt](https://docs.artinals.com/artinals-protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.artinals.com/artinals-protocol/art20/markdown/userbalance.md).

# UserBalance

**UserBalance** tracks how many NFTs from a particular collection an address holds. Instead of holding individual NFT objects, a user can have a single UserBalance object representing the count of NFTs from that collection.\
**Key fields**:

* `collection_id`: Identifies the collection.
* `balance`: The number of NFTs the user holds from that collection.