The Maps Vector web services suite offers the following APIs:

Tile

TomTom's global digital map content comprises a large volume of data, and to efficiently transmit map images for display over the internet to multiple users simultaneously, the data are divided in to gridded sections called tiles. The tiles are rendered at various sizes and available at 23 different zoom levels, ranging from 0 to 22. For zoom level 0, the entire earth is displayed on one single tile, while at zoom level 22, the world is divided into 2⁴⁴ tiles.