curl --request GET \
  --url https://test.deribit.com/api/v2/private/get_order_margin_by_ids \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": 5625,
  "method": "private/get_order_margin_by_ids",
  "params": {
    "ids": [
      "ETH-349280",
      "ETH-349279",
      "ETH-349278"
    ]
  }
}
'

{
  "jsonrpc": "2.0",
  "id": 5625,
  "result": [
    {
      "order_id": "ETH-349278",
      "initial_margin": 0.00091156,
      "initial_margin_currency": "ETH"
    },
    {
      "order_id": "ETH-349279",
      "initial_margin": 0,
      "initial_margin_currency": "ETH"
    },
    {
      "order_id": "ETH-349280",
      "initial_margin": 0,
      "initial_margin_currency": "ETH"
    }
  ]
}