Anchor Browser has documentation here showing how to combine x402 with an agentic browser session.
https://anchorbrowser.io/blog/pay-to-win-coinbase-x402-ancho...
We are not far off from humans giving a monthly allowance to their agentic counterparts.
Both let you transmit arbitrary data, but the custom setup here is a lot of overhead. Hubble gives you an SDK and lets you get back to building your device.