// Request
curl -X POST https://testnet-rpc1.autheo.com -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"web3_sha3","params":["0x68656c6c6f20776f726c64"],"id":64}'
// Result
{"jsonrpc":"2.0","id":64,"result":"0x5b2c76da96136d193336fad3fbc049867b8ca157da22f69ae0e4923648250acc"}}