There is none, not for statutes and definitely not for case law; even at the appellate level where you have multiple federal circuits, then 50 states, then territories, military, tribal and a whole host of other niche courts. And the appellate court systems can be split into districts, and by lower and higher levels.

Then if you want to really get into it, The People should also be able to access trial court level, and at that point you have over 3000 distinct court systems with their own access systems, usually requiring logins and CAPTCHAs, and half of them not even having anything accessible online at all, and the other half only having recent stuff online and the rest rotting in a flooded basement.

We have hosted bulk case law at Free Law Project for over a decade: https://wiki.free.law/c/courtlistener/help/api/bulk-data