API for organic competition data on Google

Hi, I'm creating a tool similar to Ubersuggest that will get data from a keyword such as average monthly search, CPC, competition in ads... and for that I'm using the official Google Ads API.

However, I need to recover the difficulty in ranking organically, something that Ubersuggest does. I tried using Moz with 'data.keyword.metrics.difficulty.fetch', but most of the keywords I searched for didn't find any data.

Is there another API with cost and quality to get this data?

If I can't find it or it's too expensive, I thought about even recovering the sites ranked for that keyword and then analyzing the DR/DR of each domain, taking the average and doing some calculations to measure the organic difficulty.

Nice project! Ahrefs and SEMrush APIs offer good keyword difficulty data but can be expensive. Your idea to analyze top sites’ domain ratings to estimate difficulty is a smart alternative. Best of luck buddy.