Tick History carries content from over 700 venues and 3rd party contributors, with over 250 of these available as Venue By Day files today (and a roadmap to increase this number over time). To see the full list, we recommend accessing the Data Coverage guide, which is available on 'My Account' (Navigate to Products, Tick History v2 and - at time of writing - it's the first document listed on the page).

This question was first asked in a webinar (31^st of May) please see here: Introduction to Tick History REST API