the availability of no-KYC services for specific pairs like XMR to USDT depends on the platform's policies and operational model. You can try these 2 in my opinion:-
1. SimpleSwap
SimpleSwap is a non-custodial exchange that facilitates direct cryptocurrency swaps without requiring account creation, aligning with no-KYC preferences. However, for larger amounts, users should verify current policies, as exchange limits may apply.
2. Atomic Wallet:
Its website explicitly states no accounts, no verification, and no KYC for basic features, ensuring users retain full control over their funds and privacy. This makes it an excellent option for anonymous swaps.