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

# Track ERC-721 Transfers

In this tutorial, we build upon the previous in which we tracked ERC20 transfers. To monitor NFT transfers, we will utilize the event signature. If you wish to receive a notification every time a Dokyo NFT is transferred, you can use an expression similar to the following:

```bash theme={null}
curl --location 'https://glacier-api.avax.network/v1/webhooks' \
--header 'x-glacier-api-key: <YOUR_API_KEY>' \
--header 'Content-Type: application/json' \
--data '{
    "url": "https://webhook.site/961a0d1b-a7ed-42fd-9eab-d7e4c7eb1227",
    "chainId": "43114",
    "eventType": "address_activity",
    "metadata": {
        "addresses": ["0x54C800d2331E10467143911aabCa092d68bF4166"],
        "includeInternalTxs": false,
        "includeLogs": true,
        "eventSignatures": [
           "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
        ]

    },
    "name": "Dokyo NFT",
    "description": "Dokyo NFT"
}'
```

Whenever an NFT is transferred you’ll receive a payload like this:

```json theme={null}
{
  "webhookId": "6d1bd383-aa8d-47b5-b793-da6d8a115fde",
  "eventType": "address_activity",
  "messageId": "6a364b45-47a2-45af-97c3-0ddc2e87ad36",
  "event": {
    "transaction": {
      "blockHash": "0x30da6a8887bf2c26b7921a1501abd6e697529427e4a4f52a9d4fc163a2344b46",
      "blockNumber": "42649820",
      "from": "0x0000333883f313AD709f583D0A3d2E18a44EF29b",
      "gas": "245004",
      "gasPrice": "30000000000",
      "maxFeePerGas": "30000000000",
      "maxPriorityFeePerGas": "30000000000",
      "txHash": "0x2f1a9e2b8719536997596d878f21b70f2ce0901287aa3480d923e7ffc68ac3bc",
      "txStatus": "1",
      "input": "0xafde1b3c0000000000000000000000000…0000000000000000000000000000000000",
      "nonce": "898",
      "to": "0x398baa6ffc99126671ab6be565856105a6118a40",
      "transactionIndex": 0,
      "value": "0",
      "type": 0,
      "chainId": "43114",
      "receiptCumulativeGasUsed": "163336",
      "receiptGasUsed": "163336",
      "receiptEffectiveGasPrice": "30000000000",
      "receiptRoot": "0xdf05c214cee5ff908744e13a3b2879fdba01c9c7f95073670cb23ed735126178",
      "contractAddress": "0x0000000000000000000000000000000000000000",
      "blockTimestamp": 1709930290
    },
    "logs": [
      {
        "address": "0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7",
        "topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        "topic1": "0x0000000000000000000000008cdd7a500f21455361cf1c2e01c0525ce92481b2",
        "topic2": "0x0000000000000000000000000000333883f313ad709f583d0a3d2e18a44ef29b",
        "topic3": null,
        "data": "0x000000000000000000000000000000000000000000000001a6c5c6f4f4f6d060",
        "transactionIndex": 0,
        "logIndex": 0,
        "removed": false
      },
      {
        "address": "0x54C800d2331E10467143911aabCa092d68bF4166",
        "topic0": "0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925",
        "topic1": "0x0000000000000000000000000000333883f313ad709f583d0a3d2e18a44ef29b",
        "topic2": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "topic3": "0x0000000000000000000000000000000000000000000000000000000000001350",
        "data": "0x",
        "transactionIndex": 0,
        "logIndex": 1,
        "removed": false
      },
      {
        "address": "0x54C800d2331E10467143911aabCa092d68bF4166",
        "topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        "topic1": "0x0000000000000000000000000000333883f313ad709f583d0a3d2e18a44ef29b",
        "topic2": "0x0000000000000000000000008cdd7a500f21455361cf1c2e01c0525ce92481b2",
        "topic3": "0x0000000000000000000000000000000000000000000000000000000000001350",
        "data": "0x",
        "transactionIndex": 0,
        "logIndex": 2,
        "removed": false
      },
      {
        "address": "0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7",
        "topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        "topic1": "0x0000000000000000000000008cdd7a500f21455361cf1c2e01c0525ce92481b2",
        "topic2": "0x00000000000000000000000087f45335268512cc5593d435e61df4d75b07d2a2",
        "topic3": null,
        "data": "0x000000000000000000000000000000000000000000000000087498758a04efb0",
        "transactionIndex": 0,
        "logIndex": 3,
        "removed": false
      },
      {
        "address": "0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7",
        "topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
        "topic1": "0x0000000000000000000000008cdd7a500f21455361cf1c2e01c0525ce92481b2",
        "topic2": "0x000000000000000000000000610512654af4fa883bb727afdff2dd78b65342b7",
        "topic3": null,
        "data": "0x000000000000000000000000000000000000000000000000021d261d62813bec",
        "transactionIndex": 0,
        "logIndex": 4,
        "removed": false
      },
      {
        "address": "0x398BAa6FFc99126671Ab6be565856105a6118A40",
        "topic0": "0x50273fa02273cceea9cf085b42de5c8af60624140168bd71357db833535877af",
        "topic1": null,
        "topic2": null,
        "topic3": null,
        "data": "0x0000000000009911a89f400000000000000000000…0000010",
        "transactionIndex": 0,
        "logIndex": 5,
        "removed": false
      }
    ]
  }
}
```


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