Missive

Missive is a team inbox and collaboration platform that brings email, SMS, WhatsApp, Instagram, Facebook Messenger, and live chat into one unified workspace. It provides a REST API for managing conversations, messages, contacts, labels, drafts, analytics, and automation rules, enabling teams to integrate Missive into business workflows. The API supports webhooks for real-time event notifications, custom channels for integrating external communication sources, and UI/iFrame integrations via JavaScript. Developers can automate drafts, sync contacts, generate analytics reports, and build custom integrations with the platform.

Missive publishes 7 API contracts indexed on the APIs.io network, including Analytics API, Contact Books API, Contact Groups API, and 4 more. Tagged areas include Team Inbox, Collaboration, Email, Messaging, and Conversations.

The Missive catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Missive’s developer surface includes authentication, documentation, engineering blog, pricing, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

49.6/100 developing ▬ flat Agent 22/100 agent aware Front door AI 3/6 light Heartbeat 15/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract

Team Inbox Collaboration Email Messaging Conversations Contacts Webhook Automation REST API

What this lets a business do 2

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

Customer Relationship Management

BC-420

Contacts

POST /contacts

Customer Service Management

BC-430

Conversations

GET /conversations GET /conversations/{id} GET /conversations/{id}/messages POST /conversations/{id}/merge

Kin Score

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

Composite quality — 49.6/100 · developing

Contract Quality 10.4 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 8.7 / 15

Operational Transparency 5.4 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 4.1 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 7 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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/.

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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
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 23.8 — up to +15.2 composite points
Contract Quality scores 55.6 — up to +11.1 composite points
Contract Governance scores 13.6 — up to +10.4 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/missive/apis.yml: open an issue on github.com/api-evangelist/missive 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Workplace Collaboration App Marketplaces	builds-on	15.4	-	-
Zoom App Marketplace and Partner Ecosystem (builders and partners on Zoom)	builds-on	15.4	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 7

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

Missive Analytics API

Create and retrieve analytics reports

Missive Contact Books API

List available contact books

Missive Contact Groups API

List contact groups and organizations

Missive Contacts API

Manage contacts and contact data

Missive Conversations API

Manage conversations in the inbox

Missive Drafts API

Create and delete draft messages

Missive Messages API

Create messages in custom channels

Scroll for all 7

Open Collections 7

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

Missive REST Analytics API

OPEN COLLECTION

Missive REST Analytics Contact Books API

OPEN COLLECTION

Missive REST Analytics Contact Groups API

OPEN COLLECTION

Missive REST Analytics Contacts API

OPEN COLLECTION

Missive REST Analytics Conversations API

OPEN COLLECTION

Missive REST Analytics Drafts API

OPEN COLLECTION

Missive REST Analytics Messages API

OPEN COLLECTION

Scroll for all 7

Missive API pricing

Prices published by Missive, read 2026-09-20 from missiveapp.com/pricing.

Plan	Price
Starter	$14 per user/month Includes: Email, SMS, social accounts; Team spaces and inboxes; Conversations and tasks; SOC 2 Type II complia
Productive	$24 per user/month Includes: Everything in Starter plus Up to 50 users, Integrations, Rules & automations, Basic analytics, API &
Business	$36 per user/month Includes: Everything in Productive plus SAML SSO, IP restriction, Advanced analytics, Personalized onboarding,

Plan details, limits and sources →

Rate limits

Concurrent requests: Maximum of 5 concurrent requests at any given time
Per minute: 300 requests per minute (equivalent to 5 requests per second)
Per 15 minutes: 900 requests per 15 minutes (equivalent to 1 request per second)

All 5 limits →

Billed by: user · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Missive Plans Pricing

3 plans

PLANS

Missive Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Missive Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Missive

SLA

FinOps 1

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

Missive Finops

FINOPS

Semantic Vocabularies 1

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

Missive Context

77 classes · 0 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Missive API Rules

62 rules · 60 errors 1 warnings 1 info

SPECTRAL

Security Posture 4

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

Missive Authentication

http · 1 scheme

SECURITY

Missive Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Missive Vulnerability Disclosure

security.txt · contact published

SECURITY

Missive Trust Center

SOC 2, GDPR

SECURITY

Agentic Access 1

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

Missive Agentic Access

19 operations · 8 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

name: Missive
description: Missive is a team inbox and collaboration platform that brings email, SMS, WhatsApp, Instagram, Facebook Messenger,
  and live chat into one unified workspace. It provides a REST API for managing conversations, messages, contacts, labels,
  drafts, analytics, and automation rules, enabling teams to integrate Missive into business workflows. The API supports webhooks
  for real-time event notifications, custom channels for integrating external communication sources, and UI/iFrame integrations
  via JavaScript. Developers can automate drafts, sync contacts, generate analytics reports, and build custom integrations
  with the platform.
type: Index
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: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/missive.png
url: https://raw.githubusercontent.com/api-evangelist/missive/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-06-12'
specificationVersion: '0.23'
aid: missive
tags:
- Team Inbox
- Collaboration
- Email
- Messaging
- Conversations
- Contacts
- Webhook
- Automation
- REST API
tags_raw:
- Team Inbox
- Collaboration
- Email
- Messaging
- Conversations
- Contacts
- Webhooks
- Automation
- REST API
apis:
- aid: missive:missive-analytics-api
  name: Missive Analytics API
  description: Create and retrieve analytics reports
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Analytics
  properties:
  - type: OpenAPI
    url: openapi/missive-analytics-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-contact-books-api
  name: Missive Contact Books API
  description: List available contact books
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Contact Books
  properties:
  - type: OpenAPI
    url: openapi/missive-contact-books-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-contact-groups-api
  name: Missive Contact Groups API
  description: List contact groups and organizations
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Contact Groups
  properties:
  - type: OpenAPI
    url: openapi/missive-contact-groups-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-contacts-api
  name: Missive Contacts API
  description: Manage contacts and contact data
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/missive-contacts-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-conversations-api
  name: Missive Conversations API
  description: Manage conversations in the inbox
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/missive-conversations-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-drafts-api
  name: Missive Drafts API
  description: Create and delete draft messages
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Drafts
  properties:
  - type: OpenAPI
    url: openapi/missive-drafts-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
- aid: missive:missive-messages-api
  name: Missive Messages API
  description: Create messages in custom channels
  humanURL: https://missiveapp.com/docs/developers/rest-api
  baseURL: https://public.missiveapp.com/v1/
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/missive-messages-api-openapi.yml
  - type: Documentation
    url: https://missiveapp.com/docs/developers/rest-api
common:
- type: CapabilityMap
  url: capabilities/missive-capability-edges.yml
  name: Missive Business Capability Map
- type: AgenticAccess
  url: agentic-access/missive-agentic-access.yml
- type: TrustCenter
  url: security/missive-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/missive-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/missive-domain-security.yml
- type: Authentication
  url: authentication/missive-authentication.yml
- type: Website
  url: https://missiveapp.com
- type: Documentation
  url: https://missiveapp.com/docs/developers/
- type: GitHubOrg
  url: https://github.com/missive
- type: LinkedIn
  url: https://www.linkedin.com/company/missive-app
- type: Blog
  url: https://missiveapp.com/blog
- type: Pricing
  url: https://missiveapp.com/pricing
- type: StatusPage
  url: https://status.missiveapp.com/
- type: X
  url: https://twitter.com/missiveapp
- type: Plans
  url: plans/missive-plans-pricing.yml
- type: RateLimits
  url: rate-limits/missive-rate-limits.yml
- type: FinOps
  url: finops/missive-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Missive API — frequently asked questions

Does Missive have an API?

Yes. APIs.io lists 7 APIs from Missive, including Missive Analytics API, Missive Contact Books API and Missive Contact Groups API, and 4 more.

Is there an OpenAPI specification for the Missive API?

Yes. APIs.io indexes 7 OpenAPI specifications for Missive, each linked for download from this page.

How do I authenticate with the Missive API?

Missive uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Missive Authentication.

How much does the Missive API cost?

Missive publishes its prices; its Starter plan is $14 per user/month as of 2026-09-20. APIs.io lists 3 pricing plans for Missive, with each plan's price, limits and inclusions under Pricing on this page.

Is the Missive API ready for AI agents?

Missive has a Kin Score of 49.6 out of 100 (developing) and an Agent Readiness score of 21.5 (agent-aware), scored by API Evangelist on 2026-11-06.

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