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GET /v1/accounts/{accountId}
Returns balance, deposit address, and account metadata. Response 
{
  "accountId": "acc_8f3a...",
  "depositAddress": "0xC0FFEE...",
  "depositChains": ["base", "ethereum", "polygon"],
  "balance": {
    "available": "1240.50",
    "locked": "85.00",
    "currency": "USDC"
  },
  "createdAt": "2026-05-06T12:00:00Z"
}
available is USDC free for new orders or withdrawals. locked is USDC reserved against open limit orders.