No one is talking about trading tokens.
The idea being that getting your tokens from Provider A is no different than Provider B, especially if they both offer the same model. You can change one value in a request to openrouter and suddenly be hitting a different provider but offering the same tokens, because they offer the same model and the same settings.
You're describing a commodity. However, the commodity isn't the tokens, but the compute capacity, i.e., serving a model. And compute capacity isn't a currency — at least not, until you can acquire compute capacity from one party and exchange it with another party.
dgellow is absolutely right: tokens aren't a currency, nor can you trade them, nor are they fungible. The original claim that "tokens are just a type of currency" [1] makes no sense.