The Sia network has been happily doing micropayments (covering 4mb of storage at a time) for over a year. At times, the total number of micropayments on the net

The Sia network has been happily doing micropayments (covering 4mb of storage at a time) for over a year. At times, the total number of micropayments on the network has been estimated to eclipse 100 transactions per second (all off-chain via payment channels). This technology is deployed if you know where to look for it.