To create outbound liquidity (to be able to send payments) is easy, you just need to open a channel to a well connected, stable node.

To top up existing depleted (empty) channels pay onchain and receive on Lightning.

​submarineswaps.org​

Open source at: https://github.com/submarineswaps/swaps-service​

​Lightning Loop​

Loop In: on-chain to off-chain, where the Loop client sends funds paid on-chain to an off-chain channel.

​golightning.club​

Send on-chain and receive bitcoin over Lightning! Up to 1000000 satoshi / 0.01 BTC.

​RedShift​

Trustless transfers between the Lightning Network, the Bitcoin blockchain, and any supported digital asset (BTC and ETH so far). Send funds on-chain and receive on Lightning.

Check the two way services listed in: CreateInboundLiquidity.md​