Roblox
Look up users and games.
Users
{target} accepts a numeric user id or a username — a non-numeric value is
resolved through Roblox’s username API first, so either works:
Both avatar fields are null when the user has not set one.
Games
{target} is a universe id or a place id — and unlike the user route, it
must be numeric. A place id is resolved to its universe first.
A non-numeric {target} answers 400; an unknown id answers 404.
Caching and cost
Both endpoints cache for five minutes, and both are cheap. Polling live
player counts from a bot is fine — see rate limits.