What's an AI Gateway and do you think you need one?

It usually starts simple. You're building a feature in your team with an AI feature in the product. One API call to OpenAI. Maybe wrapped in a small helper function. You ship a feature. It works. Then things start creeping in. Another team wants to use it. Someone adds a second model. Now you’ve got API keys sitting in different repos. Nobody’s really tracking usage. Finance asks how much you're spending on AI this month, you don’t have a clear answer which team is using how much.