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awesome-lightning-network
⚡ A curated list of awesome Lightning Network projects for developers and crypto enthusiasts
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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umbrel
A beautiful home server OS for self-hosting with an app store. Buy a pre-built Umbrel Home with umbrelOS, or install on a Raspberry Pi 4, Pi 5, any Ubuntu/Debian system, or a VPS.
start here https://github.com/bcongdon/awesome-lightning-network#learning-resources
so grab and idea and go with it. if you want a simple backend use opennode.com or btcpayserver or directly on top of clightning similar to https://github.com/ElementsProject/nanopos
Check out CLBOSS. For C-Lightning only though.
Use an offchain-to-onchain swap service like https://boltz.exchange to get inbound capacity. Create a channel anywhere, then move it to onchain funds, then create a new channel, repeat until you have sufficient inbound capacity. CLBOSS uses this technique.
Since you already got an RPi4, either Umbrel or myNode (free version) are the easiest ways to just get it running.