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Are you selling bitcoin to receive XMR or are you instead trying to buy bitcoin and then to pay with XMR?
There are a number of swap methods:
Majestic Bank, CoinSwap.click, and more. I don't know which ones have the best rates though.
Instant Exchanges / Swap Services which do not require identity verification / KYC https://cointastical.github.io/KYC-Free-Instant-Exchanges
You can also do a P2P trade where XMR is the payment method. This is common on Bisq, HodlHodl, RoboSats, LocalCoinSwap, and more.