Zus Health

Zus Health is a shared health-data platform that aggregates a patient's clinical history from external networks into the Zus Aggregated Profile (ZAP). It exposes a FHIR R4 (v4.0.1) REST API secured with OAuth2 Bearer tokens, Patient History APIs, document ingestion and retrieval, Zushooks webhooks, a GraphQL FHIR Query Service, and embeddable open-source React components.

Zus Health publishes 5 APIs on the APIs.io network, including Auth API, Documents API, FHIR API, and 2 more. Tagged areas include Health, FHIR, Interoperability, Patient Data, and Healthcare.

The Zus Health catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Zus Health’s developer surface includes authentication, documentation, engineering blog, API reference, getting-started guide, support, signup flow, and 48 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.4/100 developing ▬ flat Agent 34/100 agent ready saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreeSelf serve⚡ Free to try

1 APIs

Health FHIR Interoperability Patient Data Healthcare

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 50.4/100 · developing

Contract Quality 3.1 / 19

Developer Ergonomics 7.1 / 15

Access Clarity 9.7 / 15

Operational Transparency 8.0 / 10

Contract Governance 1.6 / 9

Discoverability 5.7 / 8

Regulatory Posture 7.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/zus: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

Zus Health Auth API

OAuth2 token issuance and exchange.

Zus Health Documents API

DocumentReference and Binary resources.

Zus Health FHIR API

General FHIR R4 resources.

Zus Health Patient API

FHIR R4 Patient resources.

Zus Health Patient History API

Jobs that retrieve external data into the Zus Aggregated Profile.

Zus FHIR & Platform API

Zus FHIR R4 REST API plus Auth Service and Patient History APIs. Implements FHIR R4 (v4.0.1) across 128 resource types with instance-level CRUD, transaction Bundles, conditional...

Zus FHIR GraphQL API (FQS)

The Zus FHIR Query Service (FQS) is a read-only GraphQL API over the FHIR data model, exposed at a single endpoint. Supports UPID-scoped (one-human) and builder-scoped queries a...

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Open Collections 7

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Zus Health Auth API

OPEN COLLECTION

Zus Health Auth Documents API

OPEN COLLECTION

Zus Health Auth FHIR API

OPEN COLLECTION

Zus Health Auth Patient API

OPEN COLLECTION

Zus Health Auth Patient History API

OPEN COLLECTION

Zus Health API

OPEN COLLECTION

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Pricing Plans 1

Published pricing tiers and plan structures.

Zus Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zus Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Zus Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Zus Zushooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Zus Authentication

http · 1 scheme

SECURITY

Zus Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Zus Agentic Access

15 operations · 7 acting

AGENTIC

Resources

Get Started 6

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Sandbox

Sandbox

Sandbox

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 16

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Lifecycle

Webhooks

Conformance

ErrorCatalog

DataModel

Components

Conventions

Idempotency

Lifecycle

Webhooks

Conformance

ErrorCatalog

DataModel

Components

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Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Postman

Postman

Access & Security 7

Authentication, authorization, and security posture

DomainSecurity

Authentication

Compliance

Authentication

DomainSecurity

Authentication

DomainSecurity

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Operate 7

Status, limits, changes, and where to get help

RateLimits

Support

StatusPage

Deprecation

ChangeLog

Deprecation

ChangeLog

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Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 4

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Blog

Blog

Source (apis.yml)

aid: zus
url: https://raw.githubusercontent.com/api-evangelist/zus/refs/heads/main/apis.yml
name: Zus Health
kind: company
description: Zus Health is a shared health-data platform that aggregates a patient's clinical history from external networks
  into the Zus Aggregated Profile (ZAP). It exposes a FHIR R4 (v4.0.1) REST API secured with OAuth2 Bearer tokens, Patient
  History APIs, document ingestion and retrieval, Zushooks webhooks, a GraphQL FHIR Query Service, and embeddable open-source
  React components.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zus.png
tags:
- Health
- FHIR
- Interoperability
- Patient Data
- Healthcare
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: zus:zus-auth-api
  name: Zus Health Auth API
  description: OAuth2 token issuance and exchange.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/zus-auth-api-openapi.yml
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-api
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/accessing-the-zap
  - type: Documentation
    url: https://docs.zushealth.com/docs/zap-basics
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Documentation
    url: https://docs.zushealth.com/docs/ingesting-documents
  - type: Documentation
    url: https://docs.zushealth.com/docs/zushooks
- aid: zus:zus-documents-api
  name: Zus Health Documents API
  description: DocumentReference and Binary resources.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  tags:
  - Documents
  properties:
  - type: OpenAPI
    url: openapi/zus-documents-api-openapi.yml
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-api
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/accessing-the-zap
  - type: Documentation
    url: https://docs.zushealth.com/docs/zap-basics
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Documentation
    url: https://docs.zushealth.com/docs/ingesting-documents
  - type: Documentation
    url: https://docs.zushealth.com/docs/zushooks
- aid: zus:zus-fhir-api
  name: Zus Health FHIR API
  description: General FHIR R4 resources.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  tags:
  - FHIR
  properties:
  - type: OpenAPI
    url: openapi/zus-fhir-api-openapi.yml
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-api
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/accessing-the-zap
  - type: Documentation
    url: https://docs.zushealth.com/docs/zap-basics
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Documentation
    url: https://docs.zushealth.com/docs/ingesting-documents
  - type: Documentation
    url: https://docs.zushealth.com/docs/zushooks
- aid: zus:zus-patient-api
  name: Zus Health Patient API
  description: FHIR R4 Patient resources.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  tags:
  - Patient
  properties:
  - type: OpenAPI
    url: openapi/zus-patient-api-openapi.yml
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-api
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/accessing-the-zap
  - type: Documentation
    url: https://docs.zushealth.com/docs/zap-basics
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Documentation
    url: https://docs.zushealth.com/docs/ingesting-documents
  - type: Documentation
    url: https://docs.zushealth.com/docs/zushooks
- aid: zus:zus-patient-history-api
  name: Zus Health Patient History API
  description: Jobs that retrieve external data into the Zus Aggregated Profile.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  tags:
  - Patient History
  properties:
  - type: OpenAPI
    url: openapi/zus-patient-history-api-openapi.yml
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-api
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/accessing-the-zap
  - type: Documentation
    url: https://docs.zushealth.com/docs/zap-basics
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Documentation
    url: https://docs.zushealth.com/docs/ingesting-documents
  - type: Documentation
    url: https://docs.zushealth.com/docs/zushooks
- name: Zus FHIR & Platform API
  description: Zus FHIR R4 REST API plus Auth Service and Patient History APIs. Implements FHIR R4 (v4.0.1) across 128 resource
    types with instance-level CRUD, transaction Bundles, conditional create/update/delete by identifier, and version-aware
    writes via the Zus-If-Match ETag header. OAuth 2.0 bearer authentication; machine-to-machine app clients supported.
  humanURL: https://docs.zushealth.com/docs/fhir-api
  baseURL: https://api.zusapi.com/fhir
  properties:
  - type: APIReference
    url: https://docs.zushealth.com/reference/general
  - type: Documentation
    url: https://docs.zushealth.com/docs/fhir-rest-api-capabilities
  - type: Conformance
    url: conformance/zus-fhir-capabilitystatement.json
- name: Zus FHIR GraphQL API (FQS)
  description: The Zus FHIR Query Service (FQS) is a read-only GraphQL API over the FHIR data model, exposed at a single endpoint.
    Supports UPID-scoped (one-human) and builder-scoped queries across resource types in the Designated Record Set. Uses the
    same OAuth 2.0 bearer token as the REST API. Beta.
  humanURL: https://docs.zushealth.com/docs/graphql-api
  baseURL: https://fqs.zusapi.com/query
  properties:
  - type: APIReference
    url: https://fqs-docs.zusapi.com/
  - type: Documentation
    url: https://docs.zushealth.com/docs/graphql-api
common:
- type: AgenticAccess
  url: agentic-access/zus-agentic-access.yml
- type: DomainSecurity
  url: security/zus-domain-security.yml
- type: Authentication
  url: authentication/zus-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/zushealth
- type: Website
  url: https://zushealth.com
- type: Documentation
  url: https://docs.zushealth.com
- type: Plans
  url: plans/zus-plans-pricing.yml
- type: RateLimits
  url: rate-limits/zus-rate-limits.yml
- type: FinOps
  url: finops/zus-finops.yml
- url: https://zushealth.com/feed/
  type: Blog
- type: DeveloperPortal
  url: https://docs.zushealth.com/docs
- type: Documentation
  url: https://docs.zushealth.com/docs/intro-to-zus
- type: APIReference
  url: https://docs.zushealth.com/reference/general
- type: GettingStarted
  url: https://docs.zushealth.com/docs/getting-started-with-the-zap
- type: Support
  url: https://docs.zushealth.com/contact-support
- type: Blog
  url: https://zushealth.com/team/blog/
- type: GitHubOrganization
  url: https://github.com/zushealth
- type: SignUp
  url: https://docs.zushealth.com/page/sign-up
- type: Login
  url: https://app.zushealth.com
- type: TermsOfService
  url: https://zushealth.com/website-terms-of-use/
- type: PrivacyPolicy
  url: https://zushealth.com/website-privacy-policy/
- type: StatusPage
  url: https://status.zusapi.com/
- type: Postman
  url: https://www.postman.com/zus-health/workspace/zus-health-workspace
- type: Compliance
  url: https://zushealth.com/platform/
- type: LLMsTxt
  url: llms/zus-llms.txt
- type: Authentication
  url: authentication/zus-authentication.yml
- type: Conventions
  url: conventions/zus-conventions.yml
- type: Idempotency
  url: conventions/zus-conventions.yml
- type: Lifecycle
  url: lifecycle/zus-lifecycle.yml
- type: Deprecation
  url: lifecycle/zus-lifecycle.yml
- type: ChangeLog
  url: changelog/zus-changelog.yml
- type: Webhooks
  url: asyncapi/zus-zushooks.yml
- type: Conformance
  url: conformance/zus-conformance.yml
- type: ErrorCatalog
  url: errors/zus-problem-types.yml
- type: DomainSecurity
  url: security/zus-domain-security.yml
- type: X-MCPServerCandidate
  url: mcp/zus-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: DataModel
  url: data-model/zus-data-model.yml
- type: Sandbox
  url: sandbox/zus-sandbox.yml
- type: Components
  url: components/zus-components.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/zus-llms.txt
- type: Authentication
  url: authentication/zus-authentication.yml
- type: Conventions
  url: conventions/zus-conventions.yml
- type: Idempotency
  url: conventions/zus-conventions.yml
- type: Lifecycle
  url: lifecycle/zus-lifecycle.yml
- type: Deprecation
  url: lifecycle/zus-lifecycle.yml
- type: ChangeLog
  url: changelog/zus-changelog.yml
- type: Webhooks
  url: asyncapi/zus-zushooks.yml
- type: Conformance
  url: conformance/zus-conformance.yml
- type: ErrorCatalog
  url: errors/zus-problem-types.yml
- type: DomainSecurity
  url: security/zus-domain-security.yml
- type: X-MCPServerCandidate
  url: mcp/zus-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: DataModel
  url: data-model/zus-data-model.yml
- type: Sandbox
  url: sandbox/zus-sandbox.yml
- type: Components
  url: components/zus-components.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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