Monero (XMR) is the cryptocurrency designed so that amounts, senders and recipients are hidden on chain; paying with it keeps the payment itself private, which matters to senders who chose a no-KYC gateway for privacy.
Bitcoin payments are public: anyone can follow an address. Monero uses ring signatures, stealth addresses and confidential amounts so that a transaction reveals nothing to an observer. For someone who chose a provider precisely because it does not collect identity, paying in a coin that does not publish a ledger of their spending is consistent.
Blocks take about two minutes and a deposit is typically credited within twenty; fees are low. Some exchanges restrict Monero withdrawals, so holding some in a personal wallet is the usual arrangement.
At SMSMeteor: Monero is accepted like any other coin, credited after confirmation and converted to the USD balance; details on the Monero page.