How do I have a lightning node?
There are plenty of guides and YouTube videos explaining that, better than what we can explain in a little text box. At what level are you?
Do you understand the concept of opening a channel?
If you are looking for the easiest and cheapest way, your answer is Umbrel and Raspberry Pi.
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I want to trade liquidity but I only have a phone Can I use Zap?
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you can run a lightning node from your phone. this approach is usually sub-optimal for receiving payments and a no-go for routing. it does function decently for sending payments. ideally you'd back it with a full node rather than trusting the default full node.
if you're interested in exploring this avenue, check out these two projects:
Open Bitcoin Wallet - https://github.com/nbd-wtf/obw
a more optimal approach would be running your own always-online full node and use a mobile app like Zeus (https://zeusln.app/). you could easily purchase, or build, a full node by selecting a package such as Start9's Embassy (https://start9.com/).
check my profile if you need DIY hardware.
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The cheapest and easiest node is to run Bitcoin Core on your current cpu, assuming can handle it
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Bitcoin Core on your CPU doesn't give you a lightning node, and to set it up by yourself requires a bit of coding knowledge
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Yes. thought OP was for nodes not just LN. Srry
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