curl --request GET \
  --url https://test.deribit.com/api/v2/public/get_delivery_prices \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "id": 3601,
  "method": "public/get_delivery_prices",
  "params": {
    "index_name": "btc_usd",
    "offset": 0,
    "count": 5
  }
}
'

{
  "jsonrpc": "2.0",
  "id": 3601,
  "result": {
    "data": [
      {
        "date": "2020-01-02",
        "delivery_price": 7131.214606410254
      },
      {
        "date": "2019-12-21",
        "delivery_price": 7150.943217777777
      },
      {
        "date": "2019-12-20",
        "delivery_price": 7175.988445532345
      },
      {
        "date": "2019-12-19",
        "delivery_price": 7189.540776143791
      },
      {
        "date": "2019-12-18",
        "delivery_price": 6698.353743857118
      }
    ],
    "records_total": 58
  }
}