Two ways to pay, one product. Agents pay per call over x402 — no account. Humans use it free, and upgrade to Pro only when they outgrow the free rate limit.
No account needed. Genuinely usable — for agents, tinkering, and individuals.
For commercial & volume use. An API key, a much higher rate limit, and the same data.
An agent hits a 402, signs a USDC micro-payment, and gets the result — no account, no card. (Agent lane; lead with this.)
x402 is the headline; Stripe (Pro) is the on-ramp for anyone who won't touch crypto. Same metering either way.