Heatmaps.tf uses open data sources to supply heatmap visualizations of recent killings within the Team Fortress online gaming community. Using the public Heatmaps.tf API, developers may make GET HTTP requests to receive CSV data sheets of real-time in game statistics. Different calls can be used to return a list of total kills in all maps with valid overviews. If queried by map, responses will include kills denoted with map coordinates and UNIX timestamps, which in conjunction may be utilized to create heatmaps that represent in-game combat. Developers may also perform requests by custom kill types and death flags in order to retrieve even more specialized gamer data.