Appendix

Appendix provides a physician‑review API that lets AI agents and applications submit health queries for board‑certified doctor evaluation, including e‑prescribing when appropriate. The service offers a human‑in‑the‑loop experience, handling patient consent, identity verification, and delivering clinical assessments via webhooks, enabling developers to build health‑focused AI products with real medical oversight.

Appendix is listed with 3 APIs on the APIs.io network: api reference API, core API, and Prescribing API Overview API. Tagged areas include Healthcare, Artificial Intelligence, Telehealth, and PhysicianReview.

The Appendix catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

Appendix’s developer surface includes authentication, pricing, documentation, API reference, getting-started guide, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.8/100 thin ▼ -8.7 Agent 24/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

3 APIs

Healthcare Artificial Intelligence TelehealthPhysicianReview

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 34.8/100 · thin

Contract Quality 7.1 / 21

Developer Ergonomics 5.3 / 17

Access Clarity 8.1 / 17

Operational Transparency 1.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.3 / 9

Regulatory Posture 2.3 / 15

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 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 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 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/.

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It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/appendix-com/"><img src="https://apis.io/badge/appendix-com/card.svg" alt="Appendix on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 33.6 — up to +16.6 composite points
Developer Ergonomics scores 31.0 — up to +13.8 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/appendix-com/apis.yml: open an issue on github.com/api-evangelist/appendix-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

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

Appendix api reference API

Appendix api reference API as documented publicly: 24 operations. Contract generated from the documentation by API Evangelist (2026-11-01); not the provider's own document.

Appendix core API

Appendix core API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist (2026-11-01); not the provider's own document.

Appendix Prescribing API Overview API

Appendix Prescribing API Overview API as documented publicly: 13 operations. Contract generated from the documentation by API Evangelist (2026-11-01); not the provider's own doc...

Appendix API pricing

Prices published by Appendix, read 2026-11-01 from appendix.com/pricing.

Plan	Price
Personal membership	$49/month +$19/month per additional family member
Developer complete review	$45/complete review
Developer incomplete review	$8 per incomplete review

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Appendix Com Plans Pricing

3 plans

PLANS

Event Specifications 1

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

Appendix Com Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Appendix Com Context

21 classes · 57 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Appendix API Rules

44 rules · 39 errors 4 warnings 1 info

SPECTRAL

JSON Schema 12

Standalone JSON Schema definitions for this provider's data models.

GetApiV1AgentEncountersEncounteridEventsResponse

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

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 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: appendix-com
name: Appendix
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://appendix.com/images/og-image.jpg
description: Appendix provides a physician‑review API that lets AI agents and applications submit health queries for board‑certified
  doctor evaluation, including e‑prescribing when appropriate. The service offers a human‑in‑the‑loop experience, handling
  patient consent, identity verification, and delivering clinical assessments via webhooks, enabling developers to build health‑focused
  AI products with real medical oversight.
url: https://artifacts.apis.io/appendix-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Healthcare
- Artificial Intelligence
- Telehealth
- PhysicianReview
tags_raw:
- Healthcare
- AI
- API
- Telemedicine
- PhysicianReview
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/appendix-com-plans-pricing.yml
- type: Spectral
  url: rules/appendix-com-rules.yml
- type: JSONLD
  url: json-ld/appendix-com-context.jsonld
- type: Vocabulary
  url: vocabulary/appendix-com-vocabulary.yml
- type: Webhooks
  url: asyncapi/appendix-com-webhooks.yml
- type: DataModel
  url: data-model/appendix-com-data-model.yml
- type: Authentication
  url: authentication/appendix-com-authentication.yml
- type: Conformance
  url: conformance/appendix-com-conformance.yml
- type: LLMsTxt
  url: llms/appendix-com-llms.txt
- type: Hosts
  url: hosts/appendix-com-hosts.yml
- type: Vendors
  url: vendors/appendix-com-vendors.yml
- type: TermsOfService
  url: https://appendix.com/terms-of-service
- type: PrivacyPolicy
  url: https://appendix.com/privacy-policy
- type: Pricing
  url: https://appendix.com/pricing
- type: GitHubOrganization
  url: https://github.com/appendixhealth
- type: Documentation
  url: https://appendix.com/docs
- type: DeveloperPortal
  url: https://appendix.com/developers/dashboard
- type: APIReference
  url: https://appendix.com/docs/api-reference/chat
- type: GettingStarted
  url: https://appendix.com/docs/prescribing-api/quickstart
- type: DomainSecurity
  url: security/appendix-com-domain-security.yml
- type: Website
  url: https://appendix.com/
apis:
- aid: appendix-com:api-reference-api
  name: Appendix api reference API
  description: 'Appendix api reference API as documented publicly: 24 operations. Contract generated from the documentation
    by API Evangelist (2026-11-01); not the provider''s own document.'
  humanURL: https://appendix.com/docs/api-reference
  baseURL: https://api.appendix.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/appendix-com-api-reference-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/appendix-com-post-api-v1-users-me-api-keys-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-users-me-api-keys-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-users-me-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-post-api-v1-users-me-api-keys-request-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-agent-encounters-encounterid-events-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-patients-response-schema.json
- aid: appendix-com:core-api
  name: Appendix core API
  description: 'Appendix core API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist
    (2026-11-01); not the provider''s own document.'
  humanURL: https://appendix.com/docs/prescribing-api
  baseURL: https://api.appendix.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/appendix-com-core-openapi-generated.yml
    x-provenance: generated
- aid: appendix-com:prescribing-api
  name: Appendix Prescribing API Overview API
  description: 'Appendix Prescribing API Overview API as documented publicly: 13 operations. Contract generated from the documentation
    by API Evangelist (2026-11-01); not the provider''s own document.'
  humanURL: https://appendix.com/docs/prescribing-api
  baseURL: https://api.appendix.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/appendix-com-prescribing-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-prescribing-encounters-id-details-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-get-api-v1-prescribing-patients-id-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-post-api-v1-prescribing-patients-request-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-post-api-v1-prescribing-sandbox-encounters-b1-a2-advance-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-post-prescribing-encounters-id-messages-response-schema.json
  - type: JSONSchema
    url: json-schema/appendix-com-post-prescribing-query-response-schema.json
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 34
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Appendix API — frequently asked questions

Does Appendix have an API?

Yes. APIs.io lists 3 APIs from Appendix, including Appendix api reference API, Appendix core API and Appendix Prescribing API Overview API.

Is there an OpenAPI specification for the Appendix API?

Yes. APIs.io indexes 3 OpenAPI specifications for Appendix, each linked for download from this page.

How do I authenticate with the Appendix API?

Appendix uses bearer-token authentication (3 schemes). The details are profiled on APIs.io as Appendix Com Authentication.

How much does the Appendix API cost?

Appendix publishes its prices; its Personal membership plan is $49/month +$19/month per additional family member as of 2026-11-01. APIs.io lists 3 pricing plans for Appendix, with each plan's price, limits and inclusions under Pricing on this page.

Is the Appendix API ready for AI agents?

Appendix has a Kin Score of 34.8 out of 100 (thin) and an Agent Readiness score of 23.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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