Piattaforma API unificata per Mercati e Previsioni

# Exchange — place an order
POST /exchange/v1/private/create-order
WS   user.order.{instrument_name}
FIX  NewOrderSingle <D>

# Predictions — market data
GET  /api/v1/predictions/events?kind=COMPANIES

{ "data": [{
  "id": "8741d85d-69fd-47c8-9be0-c65723975a1d",
  "title": "OpenAI IPO Date",
  "kind": "COMPANIES",
  "type": "league",
  "status": "active",
  "contracts_count": 2
}] }