Skip to content
FonteumThe Graph

By use case

Exclusion & monitoring (self-serve)Free roster screen — no accountExclusion & sanctions screeningCredentialing & provider-data enrichmentAudit evidence & defensible programsProvider data for AI / RAGM&A & network diligence

By buyer

Compliance & riskDevelopers & AI teams

By industry

HealthcareProviders & facilitiesFederal contractingSAM · USASpending · FAPIIS

The capability layer

APIREST + bulk accessMCP serverCallable by AI agentsFHIR R4 APIBulk exportAttestation & audit packReconciliationSource-vs-source diffsEntity graphSnapshotsPoint-in-time, bitemporal

The differentiator

Coverage & sourcesThe catalogFreshnessMethodologyCare CompareFacility qualityBrowse all datasets →
Research

The dev on-ramp

DocsAPI referenceMCP — connect your agentOne-paste installFHIR sandboxLive API surfaceQuickstartStatusChangelogSDKs & integrations
Pricing
Sign inFree roster screen →Get a signed certificate →

Solutions

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

Platform

APIMCP serverFHIR R4 APIBulk exportAttestation & audit packReconciliationEntity graphSnapshots

Data

Coverage & sourcesFreshnessMethodologyCare CompareBrowse all datasets →
Research

Developers

DocsAPI referenceMCP — connect your agentFHIR sandboxQuickstartStatusChangelogSDKs & integrations
Pricing
Sign inFree roster screen →Get a signed certificate →

Trust → Integrity → Verify

Re-hash any snapshot.

Every snapshot Fonteum publishes ships with a SHA-256 attestation. Look up any attested snapshot by its numeric id and you'll get the full envelope: the upstream archive URL, the published content hash, the attested-at timestamp, and (when available) the cached mirror URL on Fonteum's 90-day rolling S3 cache. Re-hash the bytes yourself; the result MUST equal the published hash.

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.

example attestation envelope
source OIG-LEIE · oig.hhs.gov
snapshot 2026-05-01
sha256 a3f7…e92c
✓Ed25519 chain head signed & attested

Or run the full flow at /verify · curl /verify/<id>

Or look one up the plain way

Or: curl https://fonteum.com/verify/<id>

How the re-hash flow works

  1. Look up the snapshot — GET /verify/<snapshot_id> returns the attestation envelope: content_hash,source_archive_url, cache_url (if mirrored), attested_at, and methodology_version.
  2. Download the bytes — fetch source_archive_url from the upstream agency, OR cache_url from the Fonteum 90-day mirror if the upstream URL has rotated.
  3. Re-hash — shasum -a 256 archive.csv. The result MUST equal content_hash. If it doesn't, the bytes were altered (or the source agency rotated their archive without publishing a new snapshot id) — the discrepancy is reportable to corrections@fonteum.com.
/chain — attestation chain head →/trust/integrity — full attestation index →/docs/cache — how the 90-day mirror works →

The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
15.7Mlinked 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

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.

Talk to us →
Fonteum
Platform
Platform overviewAPIMCP serverFHIR R4 APIBulk exportAttestation & audit packReconciliationEntity graphSnapshots
Solutions
All solutionsExclusion & sanctions screeningCredentialing & enrichmentAudit evidenceProvider data for AI / RAGM&A & network diligenceCompliance & riskDevelopers & AI teams
Data & sources
Coverage & sourcesBrowse all datasetsState Medicaid exclusionsFreshnessMethodologyCare CompareSanctionsOwnershipStaffingDeficienciesSpecial Focus Facilities
Federal contracting
OverviewAwards during active exclusionFederal debarment scorecardProcurement questionsContractor lookup8(a) certification guide
Developers
Developer hubDocsAPI referenceQuickstartStatusChangelogSDKs & integrationsWebhooks
Research & guides
Research hubGuidesHealthcare provider dataExclusion & sanctions screeningProvider credentialing dataHealthcare data for AIHospital margin gapProvider access gapsGlossaryComparisonsCitationsWhy Fonteum
Company
AboutPressCustomersPricingContactEditorial policyCorrections
Trust & legal
TrustTrust markQualitySecurityPrivacy policyTerms of serviceAPI & MCP termsMedical disclaimer

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

© 2026 Fonteum LLC. All rights reserved.

·hello@fonteum.com

The U.S. healthcare 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→