curl --request GET \
  --url https://api.exchange.fairx.net/rest/positions

{
  "Acme Trading": {
    "firm_name": "Acme Trading",
    "long_contribution": 100,
    "positions": {
      "BIPZ30": {
        "short_working_position": 0,
        "long_working_position": 0,
        "short_filled_position": 0,
        "symbol": "BIPZ30",
        "long_filled_position": 0,
        "short_futures_long_dollar_amount": 0,
        "long_futures_long_dollar_amount": 0,
        "initial_margin": "100"
      }
    },
    "position_limit": "5000000",
    "short_contribution": 50
  }
}