> curl -s -d '{"args": "help"}' http://localhost:6666/cmd
example: echo this is a test | md5 | base64
valid cmd:
base58
base58decode
base64
base64decode
blake2b-256
blake2b-512
echo
help
hex2str
keccak-256
md5
ripemd160
sha1
sha256
sha3-256
sha3-512
sha512
slice
slicestr