> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gains.trade/llms.txt
> Use this file to discover all available pages before exploring further.

# IERC721

*Interface for ERC721 tokens*

## balanceOf

```solidity theme={null}
function balanceOf(address) external view returns (uint256)
```

## ownerOf

```solidity theme={null}
function ownerOf(uint256) external view returns (address)
```

## transferFrom

```solidity theme={null}
function transferFrom(address, address, uint256) external
```

## tokenOfOwnerByIndex

```solidity theme={null}
function tokenOfOwnerByIndex(address, uint256) external view returns (uint256)
```