# Protocols and how to read a listing

Lesson 3 of [Agent wallet foundations for buyers](https://agentwalletindex.fyi/academy/agent-wallet-foundations.md), 12 minutes.

A payment protocol is a set of public rules. It says how an agent and a seller agree on a price and a payment. A protocol is not a wallet. A wallet may support one protocol, several or none. The protocols in this index The index tags rows with these names: x402, MPP, ACP, AP2, L402, ATXP, A2A and UC…

The rest of this lesson is for learners enrolled in the course. [See how Agent wallet foundations for buyers works](https://agentwalletindex.fyi/academy/agent-wallet-foundations.md).

Also on the [web page](https://agentwalletindex.fyi/academy/agent-wallet-foundations/protocols-and-reading-a-listing).