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setReferrer

Set a referral code. Captured live: 
{
  "block": 70873218,
  "timestamp": 1774938186661,
  "type": "setReferrer",
  "user": "0xa775d1bd91ee2cc4cae6113e5fd9c0c17b355277",
  "data": "CCXT1",
  "network": "mainnet"
}

​
agentSetAbstraction

Agent sets account abstraction. Captured live: 
{
  "block": 70873229,
  "timestamp": 1774938188168,
  "type": "agentSetAbstraction",
  "user": "0x00000000044186110001adbc00000006656631c0",
  "data": "u",
  "network": "mainnet"
}

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approveAgent

Authorize a trading agent (bot) to act on behalf of the user. 
{
  "type": "approveAgent",
  "data": {
    "agentAddress": "0x...",
    "agentName": "HyperBot",
    "extraAgentName": null
  }
}

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usdSend

Transfer USDC to another address on HyperLiquid. 
{
  "type": "usdSend",
  "data": {
    "destination": "0x...",
    "amount": "100.00"
  }
}

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withdraw3

Withdraw USDC from HyperLiquid to an external chain. 
{
  "type": "withdraw3",
  "data": {
    "amount": "500.00",
    "destination": "0x..."
  }
}

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vaultTransfer

Deposit to or withdraw from a vault. 
{
  "type": "vaultTransfer",
  "data": {
    "vaultAddress": "0x...",
    "isDeposit": true,
    "usd": "1000.00"
  }
}

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subAccountTransfer

Transfer funds between main account and sub-account. 
{
  "type": "subAccountTransfer",
  "data": {
    "subAccountUser": "0x...",
    "isDeposit": true,
    "usd": "500.00"
  }
}

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tokenDelegate

Delegate or undelegate HYPE tokens to a validator. 
{
  "type": "tokenDelegate",
  "data": {
    "validator": "0x...",
    "amount": "1000",
    "isUndelegate": false
  }
}

​
govVote

Vote on a governance proposal. 
{
  "type": "govVote",
  "data": {
    "proposalId": 42,
    "vote": true
  }
}
Account and transfer actions like usdSend, withdraw3, vaultTransfer, tokenDelegate, and govVote are infrequent on mainnet (a few per hour). They are fully formatted with named fields when they do appear.