Forum/Support Market
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When I try to deposit keys it says 'no inventory' or 'TRADE OFFER URL INVALID' even though I can trade them with other people without any problems
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Bots depends on this specific API endpoint provided by Steam:

https://wiki.teamfortress.com/wiki/WebAPI/GetPlayerItems

Right now it responses with HTTP code 503, which means service unavailable. I can't really predict when it will become available again.