To find an avatar ID for an avatar you own:
The Avatar ID is a string of characters that looks like this: avtr_12a34567-89cd-0efg-12h3-456i789j0k1l vrchat avatar id downloader link
Locate your avatar ID through the VRChat Control Panel in Unity or via logging tools. To find an avatar ID for an avatar
More sophisticated tools like and its predecessor A.R.E.S. were developed as "avatar recovery tools" with the stated intention of helping creators retrieve their lost assets. vrchat avatar id downloader link
The ID tells VRChat which asset bundle to download from their servers when you or someone else puts on the avatar. What is a VRChat Avatar ID Downloader?
VRChat's official in-app economy allowing direct purchases from creators. How Creators Can Protect Their Avatar IDs