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The x402 protocol was originally created by Coinbase and by extension Circle/Base. It is token agnostic but it's designed with a "send on behalf of user" contract so the user doesn't pay any gas and the facilitator covers the gas.
Since I'm using my Coinbase developer account the easiest facilitator to wire up was the default USDC that it was originally made for. They do have a Solona option but, honestly I'd rather not.
Now that it does work, adding other facilitators and token options is absolutely on the roadmap.