zrxiv keeps a stable, local mirror of academic papers and datasets — so every team across Epistack can reference, analyze, and build on the same copy of the literature.
Nothing is hidden. ● full · ◐ partial · ○ none. Coverage is measured from the mirror itself, not promised.
Upstream links rot, rate-limit, and retract silently. A mirror gives Epistack a citable, versioned copy — every analysis runs against the exact bytes it was built on.
We mirror what upstream indexes report as open access, and record provenance for each work. That is a test of access, not of licence — the two come apart, and which of those works we may serve is being settled. Coverage numbers are measured from the store on every load — no black boxes.