curl --request POST \
  --url https://api.uniblock.dev/uni/v1/json-rpc?chainId=1 \
  --header 'content-type: application/json' \
  --data '{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_sendPrivateTransaction",
    "params": [
      {
        "tx": "0xf86c808504a817c80082520894a0df350d2637096571f7a701cb5b1660d90cecb380b844a9059cbb000000000000000000000000b60e8dd61c5d32be8058bb8eb970870f07233155",
        "maxBlockNumber": "0x10fb80",
        "preferences": {
          "fast": true
        }
      }
    ]
  }'

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}