Voider is a shared canvas where people buy blocks once and display an image and optional link permanently while the service operates. The site presents each placement as a permanent claim on a public board rather than a temporary advertisement or subscription slot.
Users can pan and zoom across the board, choose an image, draw the block they want, and pay a price that depends on the cells covered and how close the block is to the center. As the board grows outward, outer rings are priced lower than the center, and purchased blocks remain visible unless removed or moderated.