Znap is described as 'A global business technology replacing cash, credit cards and other payment alternatives within a single mobile application' and is an website in the Business & Commerce category. There are more than 25 alternatives to Znap, not only websites but also apps for a variety of platforms, including Android, iPhone, Windows and Mac. The best alternative is Bitcoin, which is both free and Open Source. Other great sites and apps similar to Znap are PayPal (Paid), Flattr (Paid), Stripe (Paid) and Apple Wallet (Free).
Bitcoin is a peer-to-peer digital currency. Peer-to-peer (P2P) means that there is no central authority to issue new money or keep track of transactions. Instead, these tasks are managed collectively by the nodes of the network.
Flattr is a social micropayment service, that makes it easy for you to "flatter" things on the internet that you like. When you're registered to Flattr, you pay a small monthly fee of your own choosing.
Stripe helps you create any type of payments flow—from e-commerce to recurring billing and everything in between. Stripe enables you to accept payments in minutes. Stripe makes recurring and subscription-based billing easy.
Wallet keeps things like airline boarding passes, movie tickets, and gift cards all in one place, letting you scan your iPhone or iPod touch to check in for a flight, get into a movie, redeem a coupon, and more. Wallet is what you would use to set up Apple Pay.
DASH is an open source peer-to-peer cryptocurrency that uses a system called Darksend to add privacy to transactions. It allows you keep your finances private as you make transactions, similar to cash.