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GET /v1/accounts/{accountId}/positions
Response 
{
  "positions": [
    {
      "predexonId": "px-abc123def456",
      "title": "Will Trump win the 2028 election?",
      "outcome": "Yes",
      "size": "100",
      "lockedSize": "0",
      "averagePrice": "0.495",
      "markPrice": "0.55",
      "currentValue": "55.00",
      "unrealizedPnl": "5.50"
    }
  ]
}
size is the total number of shares held. lockedSize is the portion encumbered by open limit-sell orders — size − lockedSize is available to sell. (For limit BUYs, USDC is reserved on the account balance via balance.locked, not here.) No venue field. Positions are economic exposure, not on-chain holdings — see How positions are backed for the custody model.