Paubox

Paubox is a HIPAA compliant, HITRUST certified email infrastructure company serving healthcare organizations in the United States. Its products encrypt outbound email without recipient portals, passwords, or plugins, and work alongside Google Workspace and Microsoft 365. The developer surface is three REST APIs on api.paubox.com — the Paubox Email API for transactional email (send, bulk send, message receipt, Handlebars dynamic templates, templated messages) with an SMTP relay alternative at smtp.paubox.com:587; the Paubox Marketing API for HIPAA compliant campaign mailings, drip campaigns, subscribers, subscription lists, tracking links and campaign analytics; and the Paubox Forms API for building, hosting and processing secure patient intake forms with public respondent endpoints and scoped management endpoints. Paubox publishes OpenAPI 3.0 definitions for all three, official SDKs for ten languages, a Node-based CLI, delivery webhooks, an llms.txt, an A2A agent card, a published Agent Skill, and a hosted MCP server at mcp.paubox.com exposing 30 tools across email, forms and marketing.

Paubox publishes 12 APIs on the APIs.io network, including Analytics API, Campaign Mailings API, Drip Campaigns API, and 9 more. Tagged areas include Email, HIPAA, Healthcare, Compliance, and Transactional Email.

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

Paubox’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 33 more developer resources.

🌐 Visit website 📡 Source on GitHub

71.5/100 exemplar ▬ flat Agent 62/100 agent ready Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-09-20 · rubric v0.22.0

AccessFreemiumSelf serve⚡ Free to try

3 APIs 1 MCP Servers

Email HIPAA Healthcare Compliance Transactional Email Email Marketing Forms Security Encryption Messaging

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Marketing Management

BC-400

analyticscampaign_mailingsdrip_campaignssubscriberssubscription_listssubscriptions

POST /campaign_mailings POST /campaign_mailing_schedules GET /analytics/campaign_mailing_send_totals GET /analytics/subscribers_by_tracking_link

Kin Score

Kin Score How this is scored →
scored 2026-09-20 · rubric v0.22.0

Composite quality — 71.5/100 · exemplar

Contract Quality 12.3 / 19

Developer Ergonomics 11.8 / 15

Access Clarity 13.8 / 15

Operational Transparency 5.6 / 10

Contract Governance 1.6 / 9

Discoverability 6.1 / 8

Regulatory Posture 6.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 62/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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/paubox: 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 13

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

Paubox MCP Server

Hosted Model Context Protocol server exposing 30 Paubox tools across email, forms and email marketing to MCP-compatible AI clients. Reachable over streamable HTTP at https://mcp...

Paubox Analytics API

Campaign analytics and reporting operations

Paubox Campaign Mailings API

Campaign mailing management and sending operations

Paubox Drip Campaigns API

Drip campaign management and automation operations

Paubox Dynamic Templates API

Manage and use dynamic Handlebars templates for email content

Paubox Form management API

Create, list, update, copy, and archive forms (requires API key)

Paubox Forms API

Retrieve form definitions and accept submissions

Paubox Messages API

Send individual or bulk transactional email

Paubox Submissions API

List and export form submissions (requires API key)

Paubox Subscribers API

Subscriber management operations

Paubox Subscription Lists API

Subscription list management operations

Paubox Subscriptions API

Subscriber opt-in and opt-out operations

Paubox Tracking Links API

Tracking link analytics and data operations

Scroll for all 13

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Paubox MCP Server

Paubox ships a first-party Model Context Protocol server exposing 30 tools across the Email API, Forms API and Marketing API. It is offered over two transports: a hosted streama...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Paubox Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Paubox Rate Limits

4 limits

RATE LIMITS

Event Specifications 1

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

Paubox Email Webhooks

ASYNCAPI

Security Posture 4

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

Paubox Authentication

apiKey/http/oauth2 · 5 schemes

SECURITY

Paubox Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Paubox Vulnerability Disclosure

disclosure policy published

SECURITY

Paubox Trust Center

paubox_own, inherited_from_infrastructure

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

AgentSkill

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 4

Authentication, authorization, and security posture

Compliance

TrustCenter

Authentication

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

Support

HelpCenter

StatusPage

RateLimits

Contact

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 5

Properties that don't map to a standard resource type

CapabilityMap

Overlay

Overlay

Overlay

AgentCard

Source (apis.yml)

aid: paubox
name: Paubox
description: Paubox is a HIPAA compliant, HITRUST certified email infrastructure company serving healthcare organizations
  in the United States. Its products encrypt outbound email without recipient portals, passwords, or plugins, and work alongside
  Google Workspace and Microsoft 365. The developer surface is three REST APIs on api.paubox.com — the Paubox Email API for
  transactional email (send, bulk send, message receipt, Handlebars dynamic templates, templated messages) with an SMTP relay
  alternative at smtp.paubox.com:587; the Paubox Marketing API for HIPAA compliant campaign mailings, drip campaigns, subscribers,
  subscription lists, tracking links and campaign analytics; and the Paubox Forms API for building, hosting and processing
  secure patient intake forms with public respondent endpoints and scoped management endpoints. Paubox publishes OpenAPI 3.0
  definitions for all three, official SDKs for ten languages, a Node-based CLI, delivery webhooks, an llms.txt, an A2A agent
  card, a published Agent Skill, and a hosted MCP server at mcp.paubox.com exposing 30 tools across email, forms and marketing.
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://www.paubox.com/hubfs/Logos/Paubox_Primary_color.svg
url: https://raw.githubusercontent.com/api-evangelist/paubox/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-26'
modified: '2026-08-26'
tags:
- Email
- HIPAA
- Healthcare
- Compliance
- Transactional Email
- Email Marketing
- Forms
- Security
- Encryption
- Messaging
apis:
- aid: paubox:paubox-mcp-server
  name: Paubox MCP Server
  description: Hosted Model Context Protocol server exposing 30 Paubox tools across email, forms and email marketing to MCP-compatible
    AI clients. Reachable over streamable HTTP at https://mcp.paubox.com/mcp with OAuth or an `x-paubox-api-key` header, and
    over stdio via the `@paubox/mcp` package.
  humanURL: https://docs.paubox.com/mcp-server/index
  baseURL: https://mcp.paubox.com/mcp
  tags:
  - MCP
  - Agents
  - Email
  properties:
  - type: MCPServer
    url: mcp/paubox-mcp.yml
  - type: ToolCrosswalk
    url: mcp/paubox-tool-crosswalk.yml
  - type: Documentation
    url: https://docs.paubox.com/mcp-server/tools
- aid: paubox:paubox-analytics-api
  name: Paubox Analytics API
  description: Campaign analytics and reporting operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Analytics
  tags_raw:
  - analytics
  properties:
  - type: OpenAPI
    url: openapi/paubox-analytics-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-campaign-mailings-api
  name: Paubox Campaign Mailings API
  description: Campaign mailing management and sending operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags: []
  tags_raw:
  - campaign_mailings
  properties:
  - type: OpenAPI
    url: openapi/paubox-campaign-mailings-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-drip-campaigns-api
  name: Paubox Drip Campaigns API
  description: Drip campaign management and automation operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Drip Campaigns
  tags_raw:
  - drip_campaigns
  properties:
  - type: OpenAPI
    url: openapi/paubox-drip-campaigns-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-dynamic-templates-api
  name: Paubox Dynamic Templates API
  description: Manage and use dynamic Handlebars templates for email content
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Dynamic Templates
  properties:
  - type: OpenAPI
    url: openapi/paubox-dynamic-templates-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-form-management-api
  name: Paubox Form management API
  description: Create, list, update, copy, and archive forms (requires API key)
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Form management
  properties:
  - type: OpenAPI
    url: openapi/paubox-form-management-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-forms-api
  name: Paubox Forms API
  description: Retrieve form definitions and accept submissions
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Forms
  properties:
  - type: OpenAPI
    url: openapi/paubox-forms-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-messages-api
  name: Paubox Messages API
  description: Send individual or bulk transactional email
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/paubox-messages-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-submissions-api
  name: Paubox Submissions API
  description: List and export form submissions (requires API key)
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Submissions
  properties:
  - type: OpenAPI
    url: openapi/paubox-submissions-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-subscribers-api
  name: Paubox Subscribers API
  description: Subscriber management operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Subscribers
  tags_raw:
  - subscribers
  properties:
  - type: OpenAPI
    url: openapi/paubox-subscribers-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-subscription-lists-api
  name: Paubox Subscription Lists API
  description: Subscription list management operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Subscription Lists
  tags_raw:
  - subscription_lists
  properties:
  - type: OpenAPI
    url: openapi/paubox-subscription-lists-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-subscriptions-api
  name: Paubox Subscriptions API
  description: Subscriber opt-in and opt-out operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Subscription
  tags_raw:
  - subscriptions
  properties:
  - type: OpenAPI
    url: openapi/paubox-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
- aid: paubox:paubox-tracking-links-api
  name: Paubox Tracking Links API
  description: Tracking link analytics and data operations
  humanURL: https://docs.paubox.com/email-api
  baseURL: https://api.paubox.com/v1/email
  tags:
  - Tracking Links
  tags_raw:
  - tracking_links
  properties:
  - type: OpenAPI
    url: openapi/paubox-tracking-links-api-openapi.yml
  - type: Documentation
    url: https://docs.paubox.com/email-api
  - type: GettingStarted
    url: https://docs.paubox.com/email-api/quickstart
  - type: Authentication
    url: https://docs.paubox.com/email-api/authentication
  - type: Documentation
    url: https://docs.paubox.com/marketing
  - type: Documentation
    url: https://docs.paubox.com/forms/index
  - type: Authentication
    url: https://docs.paubox.com/forms/authentication
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/paubox-capability-edges.yml
  name: Paubox Business Capability Map
- type: Overlay
  url: overlays/paubox-email-api-overlay.yaml
- type: Overlay
  url: overlays/paubox-marketing-api-overlay.yaml
- type: Overlay
  url: overlays/paubox-forms-api-overlay.yaml
- type: Website
  url: https://www.paubox.com/
- type: DeveloperPortal
  url: https://docs.paubox.com/welcome
- type: Documentation
  url: https://docs.paubox.com/welcome
- type: APIReference
  url: https://docs.paubox.com/email-api
- type: GettingStarted
  url: https://docs.paubox.com/email-api/quickstart
- type: Support
  url: https://support.paubox.com/
- type: HelpCenter
  url: https://github.com/Paubox/community/discussions
- type: Blog
  url: https://www.paubox.com/blog
- type: GitHubOrganization
  url: https://github.com/Paubox
- type: Pricing
  url: https://www.paubox.com/pricing/paubox-email-api
- type: SignUp
  url: https://www.paubox.com/pricing/paubox-email-api
- type: Login
  url: https://next.paubox.com/users/sign_in
- type: TermsOfService
  url: https://www.paubox.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.paubox.com/privacy-policy
- type: StatusPage
  url: https://status.paubox.com/
- type: Compliance
  url: https://www.paubox.com/security
- type: TrustCenter
  url: security/paubox-trust-center.yml
- type: LLMsTxt
  url: llms/paubox-llms.txt
- type: AgentCard
  url: a2a/paubox-a2a.yml
- type: AgentSkill
  url: skills/_index.yml
- type: MCPServer
  url: mcp/paubox-mcp.yml
- type: Packages
  url: packages/paubox-packages.yml
- type: SDKs
  url: packages/paubox-packages.yml
- type: CLI
  url: cli/paubox-cli.yml
- type: Authentication
  url: authentication/paubox-authentication.yml
- type: Conventions
  url: conventions/paubox-conventions.yml
- type: ErrorCatalog
  url: errors/paubox-problem-types.yml
- type: Lifecycle
  url: lifecycle/paubox-lifecycle.yml
- type: Conformance
  url: conformance/paubox-conformance.yml
- type: DomainSecurity
  url: security/paubox-domain-security.yml
- type: Plans
  url: plans/paubox-plans-pricing.yml
- type: RateLimits
  url: rate-limits/paubox-rate-limits.yml
- type: DataModel
  url: data-model/paubox-data-model.yml
- type: Webhooks
  url: asyncapi/paubox-email-webhooks.yml
- type: WellKnown
  url: well-known/paubox-well-known.yml
- type: Contact
  url: mailto:support@paubox.com
x-enrichment:
  date: '2026-08-26'
  status: enriched
  artifacts_added: 35
  pass: local-v1

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curl "https://apis.io/api/v1/providers/paubox"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/paubox/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/paubox/evidence"

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