Zelis

Zelis is a healthcare financial technology company that modernizes the business of healthcare by connecting payers, providers, and members through a connected platform for claims cost management, electronic payments, and member and provider communications. Its solutions span network analytics and optimization, claims pricing, editing and payment integrity, electronic provider payments (including the ZAPP platform), member engagement, price transparency and Transparency in Coverage compliance, and provider directory data. Zelis exposes these capabilities to partners through a public developer portal and API marketplace, where integrators can register for OAuth2 client-credential access to a catalog of claims, ID card, provider directory, enrollment, payments, and member-engagement communication APIs. The company serves 725+ payers and processes payments to hundreds of thousands of healthcare providers.

Zelis publishes 1 API on the APIs.io network. Tagged areas include Company, Healthcare, Healthcare Payments, Claims, and Payments.

Zelis’ developer surface includes documentation, API reference, getting-started guide, signup flow, pricing, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

25.6/100 emerging ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessSelf serve

1 APIs

Company Healthcare Healthcare Payments Claims Payments Price Transparency Provider Directory Member Engagement Insurance Fintech

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 25.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 5.4 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 5.7 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 Insurance 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/zelis: 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 1

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

Zelis API

Zelis' partner-facing API platform, published through the Zelis developer portal and API marketplace. The catalog spans claims document search and viewing, member ID card search...

Security Posture 2

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

Zelis Authentication

oauth2/apiKey · 2 schemes

SECURITY

Zelis Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: zelis
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zelis.png
name: Zelis
description: Zelis is a healthcare financial technology company that modernizes the business of healthcare by connecting payers,
  providers, and members through a connected platform for claims cost management, electronic payments, and member and provider
  communications. Its solutions span network analytics and optimization, claims pricing, editing and payment integrity, electronic
  provider payments (including the ZAPP platform), member engagement, price transparency and Transparency in Coverage compliance,
  and provider directory data. Zelis exposes these capabilities to partners through a public developer portal and API marketplace,
  where integrators can register for OAuth2 client-credential access to a catalog of claims, ID card, provider directory,
  enrollment, payments, and member-engagement communication APIs. The company serves 725+ payers and processes payments to
  hundreds of thousands of healthcare providers.
url: https://raw.githubusercontent.com/api-evangelist/zelis/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- bain-capital-ventures
- norwest-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Healthcare
- Healthcare Payments
- Claims
- Payments
- Price Transparency
- Provider Directory
- Member Engagement
- Insurance
- Fintech
tags_raw:
- Company
- Healthcare
- Healthcare Payments
- Claims
- Payments
- Price Transparency
- Provider Directory
- Member Engagement
- Insurance
- FinTech
apis:
- name: Zelis API
  description: Zelis' partner-facing API platform, published through the Zelis developer portal and API marketplace. The catalog
    spans claims document search and viewing, member ID card search and viewing, provider directory, enrollment communications,
    payments communications, and member activation/reward surfaces. Access is gated behind OAuth2 client-credential tokens
    plus an Azure API Management subscription key (Ocp-Apim-Subscription-Key).
  humanURL: https://developer.zelis.com/
  baseURL: https://api.zelis.com/
  tags:
  - Healthcare
  - Claims
  - Payments
  - Provider Directory
  properties:
  - type: Authentication
    url: authentication/zelis-authentication.yml
  - type: Conventions
    url: conventions/zelis-conventions.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.zelis.com/
- type: DeveloperPortal
  url: https://developer.zelis.com/
- type: Documentation
  url: https://developer.zelis.com/guides
- type: APIReference
  url: https://marketplace.zelis.com/api-catalog/
- type: GettingStarted
  url: https://developer.zelis.com/guides/getting-started-guests
- type: SignUp
  url: https://devportalsignup.zelis.com/
- type: Pricing
  url: https://marketplace.zelis.com/connect-with-zelis/
- type: Support
  url: https://developer.zelis.com/support
- type: Blog
  url: https://www.zelis.com/blog/
- type: PrivacyPolicy
  url: https://www.zelis.com/privacy-policy/
- type: TermsOfService
  url: https://www.zelis.com/terms-of-use/
- type: Authentication
  url: authentication/zelis-authentication.yml
- type: Conventions
  url: conventions/zelis-conventions.yml
- type: Conformance
  url: conformance/zelis-conformance.yml
- type: LLMsTxt
  url: llms/zelis-llms.txt
- type: DomainSecurity
  url: security/zelis-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 5
  pass: local-v1

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