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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 →

DEVELOPERS · MODEL CONTEXT PROTOCOL

Connect your agent to data it can re-check.

One paste, and Claude, Cursor, or any MCP client can resolve U.S. healthcare providers, read federal exclusion lists, and get every fact stamped with a source, a snapshot date, and a re-checkable Ed25519 attestation. Read-only, no account — start on the free demo key.

Add Fonteum to your agentRead the API reference →

One paste to connect

The server is the npm package @fonteum/mcp, started by npx. The default key pk_dx_sample is a free, read-only demo key — 100 requests/hour, no signup.

Claude Desktop — claude_desktop_config.json
Claude Code — one command
Cursor (and any client that reads mcpServers)
Remote (streamable-HTTP) clients — point at the hosted server

Discovery card: https://fonteum.com/.well-known/mcp.json. Then restart your client and ask it to look up a provider — e.g. “Look up NPI 1234567893 with Fonteum.”

Three core tools

Read-only by charter — the agent reads facts, it never writes them. Think of them as lookup a record, search records, and a re-checkable integrity signal.

  • fonteum_get_providerlookup a record

    Look up one provider by NPI (10-digit, Luhn-checked) and get the reconciled record — every field carrying its 14-tuple provenance contract.

  • fonteum_search_providersearch records

    Search providers by specialty + state (optional county), up to 100 per call. Each hit is dated to the source snapshot it came from.

  • fonteum_check_exclusionre-checkable integrity signal

    Check an NPI against federal + state exclusion / sanction lists (OIG LEIE, SAM.gov, state Medicaid) — an exclusion & sanction-list monitoring signal for billing / program-integrity compliance. Re-confirm matches against the primary source.

Plus two more

  • fonteum_list_sources

    List the federal source families behind every field — authority, tier, refresh cadence, and official URL. Read-only.

  • fonteum_dataset_info

    Read the methodology version and the fourteen-field provenance contract that ships with each dataset.

What it looks like in the loop

The agent calls a tool, gets a fact with its source and snapshot date, and cites the re-checkable attestation back — so its answer is auditable, not asserted.

Illustrative transcript · the cite-your-source loop

user
Is NPI 1234567893 clear to bill? Cite a source I can re-check.
→ tool call
fonteum_check_exclusion({ npi: "1234567893" })
← tool result
{ "npi": "1234567893", "excluded": false, "excluded_by": [], "checked": ["OIG LEIE", "SAM.gov", "state Medicaid"], "_source": "OIG LEIE", "_snapshot": "2026-06-01", "_attestation": "/verify/1042" }
assistant
NPI 1234567893 is not on any federal or state exclusion list as of the 2026-06-01 OIG LEIE snapshot, so it carries no billing / program-integrity flag. Source: OIG LEIE via Fonteum — re-check the signed attestation yourself at fonteum.com/verify/1042.

Every fact carries its source, snapshot date, and a re-checkable attestation id — so the agent’s answer is auditable, not asserted.

Re-check what your agent cites

Every attestation the tools reference lands at /verify/<id>. Paste a snapshot id to pull the signed envelope and re-derive the hash yourself — the same proof your agent hands its user.

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>

/agents — the full agent on-ramp →/api — REST & MCP reference →/verify — re-check a snapshot →/docs — guides & quickstart →

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 →

Talk to us

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

Talk to us →
Fonteum
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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. 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→

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
69reproducible studiesEach shipping the SQL behind its figures
claude_desktop_config.json
{
  "mcpServers": {
    "fonteum": {
      "command": "npx",
      "args": ["-y", "@fonteum/mcp"],
      "env": { "FONTEUM_API_KEY": "pk_dx_sample" }
    }
  }
}
mcp.json
// ~/.cursor/mcp.json (global) or .cursor/mcp.json (project)
{
  "mcpServers": {
    "fonteum": {
      "command": "npx",
      "args": ["-y", "@fonteum/mcp"]
    }
  }
}
terminal
claude mcp add fonteum -- npx -y @fonteum/mcp
endpoint
# Clients that speak remote (streamable-HTTP) MCP can point
# straight at the hosted server — no local process:
https://fonteum.com/api/mcp