So far I've heard about IOTA and Lightning Network.
In Europe bank transfers are free. I often send $1 or $2 to roommate bank account for something from refrigerator. Also in shop I pay $2 with VISA card.
Well, before "evolving" so elegantly it was pitched as a replacement to credit/debit card systems (which would charge a whole lot less for a basic $10 transaction), and prior to that as a final answer to micropayments on the Web (I am guessing charging $0.001 to read an article is off the books now). And somewhere along the evolvement it was supposed to be a payment mechanism for calling other people's APIs and various Web services.
What's the next step in this evolution chain? Service for realtors where the transaction fee is 6% of the value of one's house?
For better or worse, Bitcoin has evolved into a financial-scale product, no longer something one would use to buy $0.50 of potatoes.
(P.S. $0.50 for 2kg of potatoes or a bottle of beer? both of those are a great deal)