Missing this in the Marketo documentation but I'm quite sure it's possible - how can I see a list of the specific REST API calls made from my Marketo instance? I've been able to locate the number of API calls made from a specific Marketo user in Admin > Integration > Web Services > Requests in the last 7 days, but I'd like to dig a little deeper.
It is likely the support can provide you with this info, but I do not think you will be able to get it on your own.
That would be worth an idea. I would vote.