> I believe with x402 and USDC you can pay as low as $0.000001 per HTTP request with no fees.

On-chain transactions are still not free. x402 isn't settled in batches or rolled up anywhere AFAIK, so large volumes of tiny payments are still not cost-effective. Facilitators such as Coinbase only subsidize transactions up to a point: https://docs.cdp.coinbase.com/x402/core-concepts/facilitator

There are ways around this, but with tradeoffs.