The Vendors page lets you view all the game's vendors and what they have available.
It also integrates with VendorEngrams.xyz to alert you when vendors are selling high-power engrams.
What shows up on the vendor page depends on which of your characters you have selected, and some other conditions.
- Spider may not appear to some characters, typically because they have not completed the Forsaken campaign. If he is missing but you usually see him, you probably need to select another one of your characters on the Vendors page.
- Petra doesn't show up in the API unless the character is logged in and standing in the Dreaming City.
- Visage of Calus stopped showing up in the API several seasons ago.