Built on the authoritative federal record
The primary sources, named on every page.
These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.
See the full source registry, with license and refresh cadence for each →
Reproducible by design
Every figure traces to its federal source.
14-tuple provenance
Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.
Reproducible SQL
Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.
Daily count checks
Published counts are checked against the upstream federal datasets on a daily cadence, with drift logged.
Named medical review
Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.
Two doors
Use the free API and open data
Query providers, facilities, sanctions, and quality scores — each field carrying its federal source. Self-serve, no call to start.
Talk to us
Managed pilots, enterprise terms, and audit-ready, signed attestation packages for compliance, risk, and research teams.
Live coverage snapshot · as of 2026-06-21 · full breakdown →
Sourced from 44 federal source families
Pick any attested snapshot and pull its signed envelope — source archive, SHA-256, Ed25519 chain head — live, no account.
Re-check it yourself
Every snapshot ships with a SHA-256 attestation. Look one up to get its source archive, published hash, and Ed25519 chain head — then re-hash the bytes yourself.
Or run the full flow at /verify · curl /verify/<id>
Our first “users” are the answer engines. GPTBot, ClaudeBot, and PerplexityBot — the crawlers that ground ChatGPT, Claude, and Perplexity — are allow-listed on every public page.
Pilot intake is open. Fonteum does not currently hold SOC 2. We publish customer evidence as pilots close — and when we do, it will be as re-checkable as everything else here. Until then, the proof is the product.
Request access →The substrate, by the numbers