Messaging API

A template and concept entry for messaging APIs. This represents the pattern and structure for messaging API implementations used in storytelling, training, and knowledge bases.

Messaging API publishes 1 API on the APIs.io network: Messages API. Tagged areas include API Pattern, Messaging, and Template.

Messaging API’s developer surface includes authentication and 1 more developer resources.

📡 Source on GitHub
26.2/100 thin ▬ flat Agent 27/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
AccessFreemiumSelf serve
1 APIs
API PatternMessagingTemplate

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 26.2/100 · thin
Contract Quality 13.8 / 23
Developer Ergonomics 2.1 / 18
Access Clarity 2.8 / 18
Operational Transparency 0.9 / 12
Contract Governance 0.0 / 11
Discoverability 4.5 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 27/100 · 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 7 / 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/messaging-api: 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 1

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

Messaging API Messages API

Managing, sending, and receiving of messages via SMS and other channels.

Open Collections 3

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

API Collection

OPEN COLLECTION

Messaging API Messages API

OPEN COLLECTION

Messaging API Messages API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Messaging Api Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Messaging Api Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Messaging Api Finops

FINOPS

Security Posture 1

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

Messaging Api Authentication

apiKey · 1 scheme

SECURITY

Agentic Access 1

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

Messaging Api Agentic Access

6 operations · 4 acting

6 operations · 4 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Access & Security 1

Authentication, authorization, and security posture

Authentication
Authentication

Source (apis.yml)

apis.yml Raw ↑ 
aid: messaging-api
name: Messaging API
description: A template and concept entry for messaging APIs. This represents the pattern and structure for messaging API
  implementations used in storytelling, training, and knowledge bases.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  try_now_blocked_by: example-domain
  source:
  - plans
  - authentication
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/messaging-api.png
url: https://raw.githubusercontent.com/api-evangelist/messaging-api/refs/heads/main/apis.yml
tags:
- API Pattern
- Messaging
- Template
created: '2024-12-29'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: messaging-api:messaging-api-messages-api
  name: Messaging API Messages API
  description: Managing, sending, and receiving of messages via SMS and other channels.
  humanURL: https://example.com/messages
  baseURL: https://api.example.com
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/messaging-api-messages-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/messaging-api-agentic-access.yml
- type: Authentication
  url: authentication/messaging-api-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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