The only way to decode an XCB address now is to open an rpc wallet for your wallet
./xcash-wallet-rpc --wallet-file WALLET_NAME --password PASSWORD --rpc-bind-port A_RANDOM_PORT --confirm-external-bind --daemon-port 18281 --disable-rpc-login --trusted-daemon
then issue this command using curl
curl -X POST 127.0.0.1:18285/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"split_integrated_address","params":{"integrated_address": "THE XCB ADDRESS"}}' -H 'Content-Type: application/json'
which will give you back the payment ID and the XCA address
I have the reverse on the explorer
https://explorer.x-cash.org/CreateIntegratedAddressbut did not see a need for the the decoding until now, so in the next update I will add the decode integrated address