Gitzman Glad you like it and also thanks for the heads up (we forgot to mention this in FAQ).
Yes it is also possible to use this feature as-a-service.
Just send your lumens to send*luwa.io by attaching the phone number into text memo.
Please note that, phone number should start with country code and can contain only numbers as in 12095293626.
That's all! Processing of the payment takes a minute then the recipient is notified with an SMS.