# Service Discovery

| brfc         | title                      | authors                                       | version |
| ------------ | -------------------------- | --------------------------------------------- | ------- |
| b2aa66e26b43 | bsvalias Service Discovery | andy (nChain), Ryan X. Charles (Money Button) | 1       |

Service discovery is separated into two phases:

* [Host Discovery](/paymail/service-discovery/host-discovery.md) is a DNS based lookup of the responsible host for a given paymail alias
* [Capability Discovery](/paymail/service-discovery/capability-discovery.md) resolves the paymail service endpoint URIs from the responsible DNS host and describes the capabilities supported by a given paymail service instance

## Service Discovery Process

<figure><img src="/files/tIij0bhCubaGJlt35Q5P" alt=""><figcaption></figcaption></figure>


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