route
A route is one web address that a seller puts a price on: a path on a host, called with a stated method. It is the unit a seller sells by and the unit a catalogue lists. A catalogue's word for the address it lists is a resource.
A web address has parts, and the standards name them. In the URI standard the host is the part that carries the registered name, and the path, with any query, identifies a resource within it. HTTP calls the target of a request a resource. A route is that same address seen from the seller's side: one a price has been put on.
In x402 the payment terms a server returns describe the protected resource by its address, and a catalogue built from those terms lists resources. A resource in a catalogue and a route in a seller's service are the same address under two names. This glossary says route for what is priced and called, and resource where a catalogue's own count is being quoted.
Three neighbouring words count different things. A host is the site a route runs on, and one host can carry many routes. An endpoint is a route together with the request sent to it. A count of hosts, a count of routes and a count of endpoints over the same services are three different numbers.
→ probe402 counted the routes that sit under payment gateways, and read the payment address each one quoted, in this issue of the Machine Commerce Reality Index.