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The capability layer

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The differentiator

Coverage & sourcesThe catalogFreshnessMethodologyCare CompareFacility qualityCompare grounded answersBrowse all datasets →
Research

The dev on-ramp

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Solutions

Exclusion & monitoring (self-serve)Exclusion & sanctions screeningCredentialing & provider-data enrichmentAudit evidence & defensible programsProvider data for AI / RAGM&A & network diligenceCompliance & riskJournalists & newsroomsDevelopers & AI teamsHealthcareSanctionsFederal contracting

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APIMCP serverFHIR R4 APIBulk exportAttestation & audit packReconciliationGrounded answersEntity graphSnapshots

Data

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Research

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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.

  • CMS
  • HHS-OIG
  • HRSA
  • FDA
  • NLM
  • NUCC
  • Census
  • BLS
  • BEA

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.

Read the full provenance and attestation methodology →

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.

Explore the API →Browse the data catalog →

Talk to us

Managed pilots, enterprise terms, and audit-ready, signed attestation packages for compliance, risk, and research teams.

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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

© 2026 Fonteum LLC. All rights reserved.

·hello@fonteum.com

The U.S. public-records graph AI can cite — every fact carries its source.

Every fact Fonteum serves carries a signed, re-checkable trust mark — source, as-of date, and an Ed25519 signature travel with the data. Re-check any fact at fonteum.com/verify · the trust-mark standard (W3C Verifiable Credentials 2.0, C2PA-aligned).
Request access→

The substrate, by the numbers

13.6Mgraph entitiesProviders, organizations, owners, and facilities
19.9Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
5Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
35dataset pagesCitable, downloadable /data catalog pages
70reproducible studiesEach shipping the SQL behind its figures

Trust → Integrity → Chain

Attestation chain head.

Every snapshot Fonteum publishes is SHA-256 hashed at write time and appended to a Certificate-Transparency-style log. The head of that log — the most recent attestation — is published below. Once the per-snapshot previous_link_hash backfill lands under §sprint3-attestation-chain, every row will additionally chain backwards to the prior row, making any tampering detectable by a single recomputation.

Current head
snapshot_id
1469
source_id
un-sanctions
snapshot_date
2026-07-09
content_hash (SHA-256)
4eb8de5c098fef065121401b95b5e17a5fb34a64ecbc8592c039153c9b768240
attested_at
2026-07-10T08:00:33.119368+00:00
previous_link_hash
(deferred — §sprint3-attestation-chain)
signing_key
(STH signing key publishes with first signed tree head)

Total attestations on file: 1385

Witness co-signatures — snapshot 1469

1 witness

  • Fonteum witness: fonteum-0

Re-derive this snapshot programmatically: /api/attestation/verify/1469

How the chain works

  1. Each upstream archive is downloaded, SHA-256 hashed, and written to snapshot_attestations with the source archive URL preserved verbatim.
  2. Each new row carries a previous_link_hashfield set to the prior row's content_hash (or all-zero for the first row in a source family). Tampering with any historical row breaks every downstream link.
  3. A periodic STH (Signed Tree Head) seals the chain head with Fonteum's chain-signing public key. Verifiers fetch the STH, walk the chain backwards, and confirm every link.
/verify — re-hash any attested snapshot →/trust/integrity — full attestation index →/docs/cache — 90-day source mirror →

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