Inside the gray market for reselling AI API credits

A blog post that reached the Hacker News front page maps out a gray market most engineers never see: the resale of unused AI API credits. Startups that got large credit grants from providers, or simply overbought, sell the surplus rather than let it expire. Brokers buy this capacity in bulk and resell it, often at 40 to 50 percent below list price, and sometimes as much as 80 percent off.

The author describes being contacted directly by brokers over email, some offering "millions" in API credit and one claiming $100,000 a day in spending capacity. The trade happens through dedicated marketplace sites like AI Credits and AICreditMart, plus Telegram channels and Reddit threads, with individual listings running from $2,500 to $200,000. The mechanics vary. The crudest version hands you someone else's provider key. More sophisticated brokers run a proxy that forwards your requests through a rotating pool of keys, so you never hold the underlying credential and the provider sees traffic it cannot easily attribute to you.

That proxy design is the part worth pausing on. Routing production traffic through an unknown intermediary means your prompts and outputs pass through their servers, and the credits you are spending may have been obtained in ways that violate the provider's terms, which can get the whole key pool banned in the middle of a request.

Why it matters

The discount is real, but so is the exposure: if you are tempted to cut your inference bill through a credit broker, you are trusting an anonymous middleman with your prompt data and betting on credits that can vanish the moment the provider notices. For most teams that tradeoff is not worth it, and it is worth telling your engineers why.