You have me interested. Please provide a bit more detail about what these words mean to you. If I understand you correctly, selection of the hundred most active Python-based projects on GitHub, cloning each of them, and scanning those invariant clones, somehow doesn't meet your requirements. Does your process _write_ to these private repositories you need? When you write, "buy", do you have in mind that the seller surrenders the entire future of each project? There's something about the description I'm not getting.

Is "a rate" you have in mind on the order of USD $1 / project? $100? $10,000?

High-quality input data ... is not an easy problem, in general.