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.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Paubox the way a machine reads it — 21 machine-readable artifacts across 3 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Paubox scores 71.9/100 (exemplar), with a separate agent-readiness read of 56/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-01 · rubric v0.18.0
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How we profile Paubox
Each block below is one kind of artifact we hold for Paubox. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 13
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 within the panel for all 13 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
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 SERVERPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Paubox Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Paubox Rate Limits
RATE LIMITSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Paubox Email Webhooks
ASYNCAPISecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Paubox — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 5
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/paubox · machine-readable index on apis.io
This is an independent, third-party profile of Paubox, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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