Can one Stripe price charge euros in Europe and dollars in the US?

No geo-IP needed. A single Price can have multiple currencies (currency_options, or "Add another currency" in the dashboard). Checkout picks the currency based on the customer's location, and you set the amount per currency yourself, so €11 can be a clean number instead of a conversion.

Alternative: Adaptive Pricing in Checkout shows local currency automatically with Stripe's conversion. Less control over nice round numbers, zero setup.

Heads up: a customer's subscription is locked to one currency once created.

We did multi-currency prices and it worked well. Only annoyance: your own reporting now mixes currencies, so revenue dashboards need converting.

Watch existing customers: once a Stripe customer has been charged in USD, you can't start a EUR subscription for that same customer. Only matters if people switch.