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 APIs 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.

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

🌐 Visit website 📡 Source on GitHub

46.4/100 developing ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessPaidOpenFree trial⚡ Free to try

1 APIs

Team Inbox Collaboration Email Messaging Conversations Contacts Webhook Automation REST API

Kin Score

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

Composite quality — 46.4/100 · developing

Contract Quality 13.8 / 23

Developer Ergonomics 4.3 / 18

Access Clarity 10.4 / 18

Operational Transparency 5.2 / 12

Contract Governance 0.0 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 20/100 · 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

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.

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/missive: 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 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 8

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

API Collection

OPEN COLLECTION

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 8

Pricing Plans 1

Published pricing tiers and plan structures.

Missive Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Missive Rate Limits

3 limits

RATE LIMITS

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

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: open
  trial: true
  try_now: true
  public: true
  label: Paid (free trial) · Open access
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  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

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