You may be interested in atomic (trustless) swaps. FixedFloat and other exchanges are trusted and they can mishandle or delay your requests. With atomic swaps, the funds are certain to arrive at the destination or they will never leave your wallet.
See this post for more: #163372
Great information, but the exception of Boltz, all atomic swaps are down. And boltz swaps only BTCs on and offchain!
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zaplocker.com still works
You can use it to atomic swap from lightning to the base layer
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If you need more than BTC swaps, use an exchange supporting LN
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