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Would you not consider PayPal one of these things? Definitely Square Cash. What's an example of local banking infrastructure that helps alleviate the problem of needing to pay people money with ease? I'm not even sure how it works on my Huntington mobile app. I know I could do it fairly painlessly with Simple bank. Except it's really only easy if they're a Simple user I think. Otherwise I'll need to get their physica…
In Canada, we have a debit card network called Interac and can use it to send an "e-Transfer" to anyone else with a Canadian bank account using nothing more than their email address or phone number + a shared secret to claim the payment. Some number of free e-Transfers per month is typically included with bank accounts. Interac solved the P2P payments problem for every social group that I'm in there.
I actually use Venmo in Canada with friends that have US bank accounts because it's still more convenient even having to calculate the exchange rate.