RawBTC on Nostr: For custodial, River or Strike can serve this purpose better than Coinbase. You don't ...

For custodial, River or Strike can serve this purpose better than Coinbase. You don't have to leave funds with the custodian for long but can instead use them as a pretty seamless "swap" service to get in/out of Lightning.

For non-custodial, Aqua is probably the simplest. Requires a couple steps because you have to peg in or out between Liquid <> on-chain BTC. Funds at rest are L-BTC, but you can pay Lightning invoices, which happen via a Boltz swap under the hood.

Blockstream's Green wallet also makes it pretty easy to receive on-chain BTC to automatically open new channels and enable LN payments.