Minecraft COAL is a pay-as-you-go Minecraft world hosting service hosted on Google Cloud Platform. While most Minecraft hosting services require a monthly fee, COAL lets you buy "COAL Pieces" that you deposit into "World Furnaces". Anyone that has access to a world can buy COAL Pieces, in effect allowing crowdfunding of per-hour world payment. Hours are used up only while players are actually playing the game.
COAL also allows web-based real-time chat monitoring, archiving, searching, and messaging, allowing you to chat with players in the game directly from the web, as well as see who is online and when. Worlds can be imported from other servers or exported out of COAL at any time.