Upside Down Research, LLC

Housecarl Arbiter productizes the last fifty years of research on reasoning under uncertainty into an advanced reasoner suitable for wide use. Built by UDR; available self-serve, from a free tier upward.

You supply the sources, claims, and evidence; the engine supplies the weighing. Each source carries a reliability score and a decay rate, so a regulatory filing outweighs an anonymous post and a stale claim loses force on a published schedule. Repetition is not counted as corroboration. Where the evidence genuinely conflicts, the engine enumerates every coherent reading rather than averaging them into one, and scores each.

Outputs are a scored verdict, a ranked claim list, and an interpretation tree that traces every conclusion back to the sources, weights, and timestamps behind it. Reproducible, and fit for record.

Arbiter measures sources against what they say; it does not adjudicate the world. If a source is wrong, Arbiter is wrong with it.

Housecarl is one of the most advanced AuthZ systems in commercial play today. Policies match by string, prefix, regex, or glob. Domains compose into a lattice with diamond inheritance — every child inherits from every superior. Multi-tenant isolation is fluid: cross-tenant requests evaluate against the target tenant's policies, not the caller's. Sessions are signed, keys revocable, passwords hashed. No sidecars required.

Deploys on Kubernetes or Linux, on infrastructure the customer owns. Sold under direct commercial terms; evaluate it in the hosted demo environment. Interfaces: gRPC and REST.