curl --request POST \
  --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=1001 \
  --header 'content-type: application/json' \
  --data '{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "klay_estimateGas",
    "params": [
      {
        "from": "0x1b3c8c1cdb4e6b6b8819345bf3c6d9c926f55f90",
        "to": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
        "value": "0xde0b6b3a7640000"
      }
    ]
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x5208"
}