Some Protomaps services such as OSM downloads are free and require no registration. Billing for the Protomaps Web API is based on API requests - a map load without interaction creates from 1 to 4 API requests, while panning and zooming the map creates more.
An account can use up to 50,000 requests per month, absolutely free. No payment information is required. Get started with a free API key.
300,000 map requests / month
29 USD / month
3,000,000 map requests / month
199 USD / month
More Map Views, Custom Data
All usage limits are "soft caps" - apps that have sudden traffic spikes aren't in any danger of being shut off.