The free dev tier now covers localhost only

Requests from workers.dev and pages.dev previews are no longer free development traffic. They are billed like any production origin.

• Free development traffic is now localhost, 127.0.0.1, [::1] and *.localhost. Nothing else.
• A request from a *.workers.dev or *.pages.dev host is billed like any production origin, and add-ons used from one need a paid plan.
• If a key lists one of those hosts in its allowed origins, it now counts against your plan's production origins. Existing keys are left as they are, and your next edit has to fit the allowance.

Action requiredTest from localhost. For a workers.dev or pages.dev preview, use a paid plan, and check that your keys' allowed origins fit the plan.

AvailabilityNot live yet. It ships with the next gateway deploy.