image-archive
Imgur
A major image host that long served as the default picture backend for Reddit and countless forums. Old uploads can be retrieved by image ID, on the site or via an API that needs a free Client-ID. It mostly matters for resolving imgur links found in archived discussions. Be aware its archival value dropped after the 2023 purge of anonymous content — many old IDs now return nothing, so verify a link still resolves before relying on it.
Why it’s useful & how it works
Free Client-ID. Reachable both ways. Many old IDs 404 after the May 2023 purge — verify existence before handing a link.
What’s inside
Reduced post-2023 purge.
API access
https://api.imgur.com/3/image/ <id> (Authorization: Client-ID <id>)
An API key is required — usually free; see the endpoints above for where to get one.
Access
Programmatic API access (a key may be required — see the API tag).