curl --request GET \
  --url https://api.simmer.markets/api/sdk/portfolio

{
  "balance_usdc": 123,
  "sim_balance": 123,
  "sim_pnl": 123,
  "total_exposure": 123,
  "positions_count": 123,
  "redeemable_count": 123,
  "pnl_24h": 123,
  "pnl_total": 123,
  "concentration": {
    "top_market_pct": 123,
    "top_3_markets_pct": 123
  },
  "by_source": {},
  "warnings": [],
  "sim": {
    "balance": 123,
    "pnl": 123,
    "positions_count": 0,
    "total_exposure": 0
  },
  "polymarket": {
    "balance": 123,
    "pnl": 123,
    "positions_count": 0,
    "total_exposure": 0
  },
  "kalshi": {
    "balance": 123,
    "pnl": 123,
    "positions_count": 0,
    "total_exposure": 0
  },
  "total": {
    "positions_count": 0,
    "total_exposure": 0
  }
}