there are too few public electron cash servers, even fewer on testnet, and even fewer on onion. there are also not enough bch gateway nodes between internet and onion.
so I opened a new public electrumx server and full node for mainnet and testnet on ipv4 and onion.
ipv4 hostname: bch0.kister.net
onion hostname: kisternet5tgeekwidrj7r7yd3n2l5j7y72b74y6xu3q2b6xdjrte6id.onion
interesting electrumx stats for