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GET /v1/accounts/{accountId}/positions/{predexonId}
Returns the user’s position in a specific market. Returns 404 if the user has no position in this market. Response 
{
  "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 be sold. Positions are economic exposure, not on-chain holdings — see How positions are backed for the custody model.