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ERC721

ERC721 resource provides operations for interacting with NFT (Non-Fungible Token) contracts.

Overview​

ERC721 is the standard for NFTs on Ethereum. Each token has a unique ID and represents a distinct asset.

Operations​

Get Balance​

Get the number of NFTs owned by an address.

Required Credentials: Ethereum RPC

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Owner Address (required): Address to check balance for

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "ownerAddress": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb"
}

Output:

{
  "balance": "5"
}

Owner Of​

Get the owner of a specific token ID.

Required Credentials: Ethereum RPC

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Token ID (required): The token ID to query

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "tokenId": "1234"
}

Output:

{
  "owner": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb"
}

Transfer From​

Transfer an NFT to another address.

Required Credentials: Ethereum RPC, Ethereum Account

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • From (required): Current owner address
  • To (required): Recipient address
  • Token ID (required): The token ID to transfer

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
  "to": "0x1111111254fb6c44bAC0beD2854e76F90643097d",
  "tokenId": "1234"
}

Output:

{
  "hash": "0x1234567890abcdef...",
  "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
  "to": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}

Safe Transfer From​

Safely transfer an NFT with receiver validation.

Required Credentials: Ethereum RPC, Ethereum Account

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • From (required): Current owner address
  • To (required): Recipient address
  • Token ID (required): The token ID to transfer

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
  "to": "0x1111111254fb6c44bAC0beD2854e76F90643097d",
  "tokenId": "1234"
}

Output:

{
  "hash": "0x1234567890abcdef...",
  "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
  "to": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}

Approve​

Approve another address to transfer a specific NFT.

Required Credentials: Ethereum RPC, Ethereum Account

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Spender (required): Address to approve
  • Token ID (required): The token ID to approve

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "spender": "0x1111111254fb6c44bAC0beD2854e76F90643097d",
  "tokenId": "1234"
}

Output:

{
  "hash": "0x1234567890abcdef...",
  "from": "0xYourAddress...",
  "to": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}

Set Approval For All​

Approve an operator to manage all NFTs.

Required Credentials: Ethereum RPC, Ethereum Account

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Operator (required): Address to approve
  • Approved (required): true to approve, false to revoke

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "operator": "0x1111111254fb6c44bAC0beD2854e76F90643097d",
  "approved": true
}

Output:

{
  "hash": "0x1234567890abcdef...",
  "from": "0xYourAddress...",
  "to": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D"
}

Get Approved​

Get the approved address for a token.

Required Credentials: Ethereum RPC

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Token ID (required): The token ID to query

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "tokenId": "1234"
}

Output:

{
  "approved": "0x1111111254fb6c44bAC0beD2854e76F90643097d"
}

Is Approved For All​

Check if an operator is approved for all tokens.

Required Credentials: Ethereum RPC

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Owner (required): Owner address
  • Operator (required): Operator address

Example:

{
  "contractAddress": "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
  "owner": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
  "operator": "0x1111111254fb6c44bAC0beD2854e76F90643097d"
}

Output:

{
  "isApprovedForAll": true
}

Token URI​

Get the metadata URI for a token.

Required Credentials: Ethereum RPC

Parameters:

  • Contract Address (required): The ERC721 NFT contract address
  • Token ID (required): The token ID to query

Example Output:

{
  "tokenURI": "ipfs://QmXxxx.../1"
}

Common Use Cases​

Monitor NFT Ownership​

[Ethereum Trigger: Event] → [Owner Of] → [Check Owner] → [Action]

Automated NFT Transfer​

[Trigger] → [Safe Transfer From] → [Wait For Transaction] → [Notification]

Check NFT Metadata​

[Trigger] → [Token URI] → [Fetch Metadata] → [Display]

Tips​

  • Safe Transfer: Prefer Safe Transfer From to prevent NFTs being sent to contracts that can't handle them
  • Token IDs: Usually sequential but can be any uint256 value
  • Metadata: Token URI typically points to JSON metadata (often on IPFS)
  • Approval: Set Approval For All is commonly used for marketplace interactions