Got my Gemini API bill for last month and it was $93. I'd been running RankSurf across 10 projects so I expected something, but my own cost tracking said it should be more like $5.
Turns out $67 of it was Google search grounding. It gets billed per search, not per token, and my scanner was quietly firing around 8 searches on every single run without me realizing it.
If you build on these APIs, go actually look at the provider's usage dashboard, because your own numbers will not match what they end up charging you.