There are many different definitions about what peer-to-peer or P2P is. In general it is a network where users can exchange files with each other. As such, each cryptocurrency uses a P2P network to exchange the coins and tokens. The most famous are of course bitcoin and the altcoin Peercoin. Besides the common exchanges, there are P2P exchanges like LocalBitcoin, where users can exchange crypto with each other.

Prefer comparing real-time prices for all crypto's and providers?