Point any Stratum miner at the endpoint below - an ASIC, a Bitaxe, or rented hashrate (works with NiceHash and MiningRigRentals). Your username is your payout address (rewards go straight there; add .workername to label a rig), and the password is x (or d=NNNN to pin a difficulty - it auto-tunes otherwise). Monero is CPU-mineable with xmrig (see its card). See how payouts work.
Bitcoin testnet4 SHA-256
URLstratum+tcp://www.testnetpool.com:3333
UsernameYOUR_tBTC_ADDRESS
Passwordx or d=NNNN to pin difficulty
Litecoin testnet Scrypt
URLstratum+tcp://www.testnetpool.com:3334
UsernameYOUR_tLTC_ADDRESS
Passwordx or d=NNNN to pin difficulty
Monero testnet RandomX
URLstratum+tcp://www.testnetpool.com:3335
UsernameYOUR_tXMR_ADDRESS
Passwordx or d=NNNN to pin difficulty
xmrig (CPU) command
xmrig --algo rx/0 --url stratum+tcp://www.testnetpool.com:3335 --user YOUR_tXMR_ADDRESS --pass x
Once connected, look up your address on the dashboard to watch your shares, best difficulty, and payouts.