# _Swap Provider_ discovery

A _Swap Provider_ is a service run by a pseudonymous entity that offers to sell Monero in exchange for Bitcoin. To swap your Bitcoin for Monero you need to connect to a one of these _Swap Providers_.
The different ways to discover _Swap Providers_ are described below.

There are two ways to discover _Swap Providers_:

1. **Public Registry**: Community volunteers maintain a list of _Swap Providers_ that is provided to the GUI and is kept up to date automatically. This list is displayed in the GUI by default. The _Public Registry_ also stores additional information about the _Swap Providers_ such as their uptime and age, and makes it available to the GUI.
2. **Rendezvous**: The GUI can discover Swap Providers using the [_Rendezvous_ protocol](https://docs.libp2p.io/concepts/discovery-routing/rendezvous/). This protocol enables the GUI to find providers that register themselves at a _Rendezvous Point_. The GUI can query these points to get a list of registered providers. _Rendezvous Points_ are operated by community volunteers, and anyone can run one. The GUI can connect to various _Rendezvous Points_ to discover different _Swap Providers_.

## _Public Registry_

The providers from the registry are displayed in the GUI. If you want to connect to them directly without the GUI choose one from the table below.

import SwapProviderTable from "../../components/SwapProviderTable";

<div>
  <SwapProviderTable />
</div>

## How to discover _Swap Providers_ via the _Rendezvous_ protocol

1. Open the _Swap Provider_ list by clicking the right-facing arrow in the widget on the _Swap_ tab.

   <img src="/rendezvous_1.png" />

2. Click the <img src="/rendezvous_button_1.png" style={{
       height: "1lh",
       display: "inline-block",
       // center vertically
       verticalAlign: "middle",
   }}/> button to open the _Discover swap providers_ dialog. Enter the _Multiaddress_ of the _Rendezvous Point_ you want to connect to. You can also choose one of the predined ones from the list below the Textfield. Click the _Connect_ button to connect to the rendezvous point.
   <img src="/rendezvous_2.png" />

## How to add a _Swap Provider_ to the _Public Registry_

If you know of a _Swap Provider_ that is not yet in the _Public Registry_, you can submit it manually. Here's how you can do it:

1. Open the _Swap Provider_ list by clicking the right-facing arrow in the widget on the _Swap_ tab.

   <img src="/rendezvous_1.png" />

2. Click the <img src="/public_registry_button_1.png" style={{
       height: "1lh",
       display: "inline-block",
       // center vertically
       verticalAlign: "middle",
   }}/> button. Enter the _Multiaddress_ of the _Swap Provider_ as well as the _Peer ID_ of the provider. Click the _Submit_ button to submit the provider to the _Public Registry_.
   <img src="/public_registry.png" />