curl --request POST \
  --url https://{network}.s.chainbase.online/v1/{api-key} \
  --header 'Content-Type: application/json' \
  --data '{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [
    {
      "from_": "0x00000000006c3852cbef3e08e8df289169ede581",
      "to": "0x00000000006c3852cbef3e08e8df289169ede581",
      "gas": "0xfffff",
      "gasPrice": "0xfffff",
      "value": "0x123123",
      "data": "0x18160ddd"
    },
    "latest"
  ]
}'

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "<string>"
}