curl --request POST \
  --url https://api.privy.io/v1/wallets/{wallet_id}/rpc \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --header 'privy-app-id: <privy-app-id>' \
  --data '{
  "method": "eth_signTransaction",
  "params": {
    "transaction": {
      "type": 118,
      "chain_id": 4217,
      "calls": [
        {
          "to": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
          "value": "0x2386F26FC10000"
        }
      ]
    }
  }
}'

{
  "method": "eth_signTransaction",
  "data": {
    "signed_transaction": "0x76f870830138de80830f4240830f437480940b81418147df37155d643b5cb65ba6c8cb7aba76872000000000000480c080a05c11a2166ec56189d993dec477477d962ce0d4c466ab7ed8982110621ec87a57a003c796590c0c62eac30acd412f2aa0e8ad740c4ded86fb64d3326ee4c0ea804c",
    "encoding": "rlp"
  }
}