Matthias Pfefferle

This plugin enables “Well-Known URIs” support for WordPress (RFC 5785: http://tools.ietf.org/html/rfc5785).
From the RFC:
It is increasingly common for Web-based protocols to require the 
 discovery of policy or other information about a host (“site-wide 
 metadata”) before making a request. For example, the Robots 
 Exclusion Protocol <a href="http://www.robotstxt.org/" rel="nofollow ugc">http://www.robotstxt.org/</a> specifies a way for 
 automated processes to obtain permission to access resources; 
 likewise, the Platform for Privacy Preferences 
 tells user-agents how to discover privacy policy beforehand.
While there are several ways to access per-resource metadata (e.g., 
 HTTP headers, WebDAV’s PROPFIND [RFC4918]), the perceived overhead 
 (either in terms of client-perceived latency and/or deployment 
 difficulties) associated with them often precludes their use in these 
 scenarios.
When this happens, it is common to designate a “well-known location” 
 for such data, so that it can be easily located. However, this 
 approach has the drawback of risking collisions, both with other such 
 designated “well-known locations” and with pre-existing resources.
To address this, this memo defines a path prefix in HTTP(S) URIs for 
 these “well-known locations”, “/.well-known/”. Future specifications 
 that need to define a resource for such site-wide metadata can 
 register their use to avoid collisions and minimise impingement upon 
 sites’ URI space.

/.well-known/

This plugin enables "Well-Known URIs" support for WordPress

mrose17

This plugin creates the /.well-known/brave-payments-verification.txt file.
You will need ‘manage_options’ capability in order to use the Settings page for this plugin.
NOTE: as with all plugins, once you are no longer using the plugin, you should de-activate it. 
This is a good security practice.

brave-payments-verification

Great

This plugin creates the /.well-known/brave-payments-verification.txt file.

/.well-known/ vs brave-payments-verification