API access to Google Keyword Planer / AdWords API

A few years ago Google revoked access to the AdWords API for everyone who used it to get SEO keywords only (= everyone who didn't spend enough money on actual AdWords ads).

I'm wondering if anyone has a good solution for this? What I want to do is get as many keywords from Google Keyword-Planer as I need (thinking a few thousand API calls per month). I'm happy to pay for it.

Not that I know of. But considering you're asking for an API, I deduct that you or someone you know has programming knowledge. It's probably easiest to write a scraper that get's the results for you