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POST /v1/accounts/{accountId}/quote
Preview the routing decision, estimated fill, and total fee before placing an order. Quote shape mirrors Place Order — same fields, same conditional rules. Request 
{
  "predexonId": "px-abc123def456",
  "side": "buy",
  "type": "market",
  "amount": 50.00
}
Response 
{
  "estimatedFilled": "100",
  "estimatedAveragePrice": "0.495",
  "estimatedNotional": "49.50",
  "estimatedFee": "0.50",
  "metadata": {
    "fills": [
      { "source": "venue", "venue": "polymarket", "size": "50", "price": "0.50", "fee": "0.25" },
      { "source": "venue", "venue": "limitless", "size": "50", "price": "0.49", "fee": "0.25" }
    ]
  },
  "expiresAt": "2026-05-06T12:00:30Z"
}
If liquidity is insufficient, estimatedFilled reflects only the executable portion. Quotes are non-binding and expire — actual fills may differ if liquidity moves between quote and order placement.