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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 reconciliation

Published counts are reconciled 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 →

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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.

The U.S. healthcare graph AI can cite — every fact carries its source.

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The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities
12.5Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities
4.7Mgraph edgesSource-attested relationships between entities
44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
33dataset pagesCitable, downloadable /data catalog pages
48reproducible studiesEach shipping the SQL behind its figures
Moat metrics

The moat, measured. Not a deck — a timestamp.

Fonteum instruments its own growth. These six metrics are collected automatically, stored append-only, and published here rolled-up and anonymized. Every number is a query against a production table, not a screenshot.

Last updated: 2026-06-07 · methodology version moat-tracker/v1

Source: Fonteum Moat Tracker (append-only)·Snapshot: 2026-06-07·Method: moat-tracker/v1
Six headline metrics

Collected weekly. Anonymized. Auditable.

M-1
AI citations
0/ wk
target≥70% prompt citation by mo 12
as of 2026-06-09method →
M-3
Snapshot history depth
Methodology

How each number is measured.

M-1 · AI citations
A locked weekly set of real user questions is sent to ChatGPT, Perplexity, Claude, and Gemini. Each response is scanned for Fonteum URLs. The headline is the number of citations across all queries that week.
M-3 · Snapshot history depth
For each federal source family we hold, we count distinct dated snapshots. The headline sums those across families — a proxy for how much history exists that a fresh competitor cannot backfill.
M-4 · FHIR API requests
Requests to the live FHIR R4 endpoints are tallied weekly and classified by consumer (AI agents, developers, browsers). The headline is total weekly requests.
M-5 · Claimed listings
The cumulative count of provider/facility listings claimed by their owners — the network-effect curve. No owner identities are published, only the total.
M-6 · Press mentions
Instrumented, not asserted

A live FHIR R4 API, a public SHA-256 attestation chain, and an open methodology back every Fonteum number. These metrics show the asset compounding — in data anyone can re-query.

FHIR R4 API
US Core 6.1.0
live · /api/fhir
Attestation chain
SHA-256 signed
public · /chain
Methodology
version v2026.05.0
public · /methodology
Provenance
14-tuple per field
source · date · confidence
Source registry
23 federal families
all primary-source · /sources
42snapshots
target52+ weekly snapshots by mo 12
as of 2026-06-15method →
M-4
FHIR API requests
504/ wk
target20,000+/wk by mo 12
as of 2026-06-15method →
M-5
Claimed listings
Pending — first run
target100+ claimed by mo 6
first reading scheduledmethod →
M-6
Press mentions
1/ wk
target20+ DR>50 domains by mo 12
as of 2026-06-08method →
M-19
Build velocity
220PRs / wk
target20+ PRs/wk
as of 2026-06-14method →
Distinct news/media URLs mentioning Fonteum, discovered weekly. The headline is the count of unique mentions that week.
M-19 · Build velocity
Pull requests merged to the main branch in the trailing 7 days, read directly from version control — a founder-execution signal.

Metrics are append-only and timestamped at collection. Each tile carries its 12-month target and an honest state: live once a reading exists, pending — first run when a self-contained metric is awaiting its next scheduled collection, or pending — key when a metric is gated on an external credential or upstream feed still to be provisioned. No placeholder zeros are ever shown. Full collection details, alert thresholds, and the underlying schema are documented in the methodology index.