# Rails, chains and custody

Lesson 2 of [Agent wallet foundations for buyers](https://agentwalletindex.fyi/academy/agent-wallet-foundations.md), 12 minutes.

Two listing fields explain where money moves and who controls it. They are the rail and the custody model. Rails A rail is the payment network under a payment. This index uses four rail values. - Stablecoin: payment in a crypto token that aims to hold a steady price, often one US dollar. - Card: pay…

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/rails-chains-and-custody).