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I don't think there's any Cryptos running on Stellar (I could be wrong), but there's 'on-chain' ethereum, bitcoin, and few others I think even BAT but they're supplied by anchors
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You can use your XLM and turn it into BTC (on Stellar DEX) from an anchor then withdraw it to your wallet or bank. They call them on and off ramps, you'll see about that in the link I listed above