Point any Stratum miner at the endpoint below - an ASIC, a Bitaxe, or cpuminer. Your username is your payout address (rewards go straight there; add .workername to label a rig), and the password is x (difficulty auto-tunes). Monero is CPU-mineable with xmrig (see its card).
Bitcoin testnet4 SHA-256
URLstratum+tcp://testnetpool.com:3333
UsernameYOUR_tBTC_ADDRESS
Passwordx or d=NNNN to pin difficulty
Bitcoin stats & payouts →Litecoin testnet Scrypt
URLstratum+tcp://testnetpool.com:3334
UsernameYOUR_tLTC_ADDRESS
Passwordx or d=NNNN to pin difficulty
Litecoin stats & payouts →Monero testnet RandomX
URLstratum+tcp://testnetpool.com:3335
UsernameYOUR_tXMR_ADDRESS
Passwordx
xmrig (CPU) command
xmrig --algo rx/0 --url testnetpool.com:3335 --user YOUR_tXMR_ADDRESS --pass x
Monero stagenet RandomX
URLstratum+tcp://testnetpool.com:3336
UsernameYOUR_sXMR_ADDRESS
Passwordx
xmrig (CPU) command
xmrig --algo rx/0 --url testnetpool.com:3336 --user YOUR_sXMR_ADDRESS --pass x
Once connected, open a coin's dashboard (links above) to watch your shares, best difficulty, and payouts.