Protomaps is a free and open-source map of the world for use in your websites, apps, and other projects: an alternative to hosted services, freer than Google Maps and simpler to adapt than OpenStreetMap.
A fraction of the cost
Can reduce your mapping bills from hundreds per month to pennies, all on cloud infrastructure you use already.
Take back control
Your map-based projects and sites don't depend on a third party service or API keys, and work offline, forever.
Protomaps also maintains a Tiles API – get a free API key. It's free for non-commercial use, or commercial use paired with a GitHub sponsorship.
It's interesting using the demo and seeing how much data is required to update the view.