LINE website screenshot

LINE

LINE is a Japan-based messaging platform with over 200 million monthly active users across Japan, Taiwan, Thailand, and Indonesia, offering messaging, payments, news, and a broad ecosystem of services. The LINE Developers platform exposes public APIs for building chatbots, mini-apps, social login, and audience marketing, all documented as OpenAPI specifications. APIs use Bearer token authentication with channel access tokens issued per LINE channel.

LINE publishes 4 APIs on the APIs.io network, including Channel API, Info API, Message API, and 1 more. Tagged areas include Messaging, Chatbots, Social Login, Mini Apps, and Marketing.

The LINE catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

LINE’s developer surface includes authentication, documentation, signup flow, pricing, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.0/100 thin ▼ -5.0 Agent 44/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessSelf serve
4 APIs 1 MCP Servers
MessagingChatbotsSocial LoginMini AppsMarketingJapan

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 36.0/100 · thin
Contract Quality 17.1 / 25
Developer Ergonomics 7.4 / 20
Commercial Clarity 2.1 / 20
Operational Transparency 0.7 / 13
Governance 3.3 / 12
Discoverability 7.4 / 10
Agent readiness — 44/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/line: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 4

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

LINE Channel API

The Channel API from LINE — 1 operation(s) for channel.

LINE Info API

The Info API from LINE — 1 operation(s) for info.

LINE Message API

The Message API from LINE — 4 operation(s) for message.

LINE Profile API

The Profile API from LINE — 1 operation(s) for profile.

Open Collections 1

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

LINE Messaging API

OPEN COLLECTION

MCP Servers 1

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

MCP Server

MCP SERVER

Event Specifications 1

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

LINE Messaging Webhook Event Surface

AsyncAPI description of the webhook event surface published by the LINE Messaging API to bot servers. The Messaging API delivers webhook events as HTTPS POST requests to the con...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

LINE API Rules

4 rules · 1 errors 2 warnings 1 info

SPECTRAL

Security Posture 3

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

Line Authentication

http · 1 scheme

SECURITY

Line Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Line Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Line Agentic Access

8 operations · 5 acting

8 operations · 5 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Signup
Signup

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 OpenAPI Repository
OpenAPI Repository

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Commercial 1

Pricing, plans, and the legal terms of use

Pricing
Pricing

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: line
name: LINE
description: LINE is a Japan-based messaging platform with over 200 million monthly active users across Japan, Taiwan, Thailand,
  and Indonesia, offering messaging, payments, news, and a broad ecosystem of services. The LINE Developers platform exposes
  public APIs for building chatbots, mini-apps, social login, and audience marketing, all documented as OpenAPI specifications.
  APIs use Bearer token authentication with channel access tokens issued per LINE channel.
type: Index
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/line.png
tags:
- Messaging
- Chatbots
- Social Login
- Mini Apps
- Marketing
- Japan
url: https://raw.githubusercontent.com/api-evangelist/line/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-29'
specificationVersion: '0.19'
apis:
- aid: line:line-channel-api
  name: LINE Channel API
  description: The Channel API from LINE — 1 operation(s) for channel.
  humanURL: https://developers.line.biz/en/docs/messaging-api/
  baseURL: https://api.line.me
  tags:
  - Channel
  properties:
  - type: OpenAPI
    url: openapi/line-channel-api-openapi.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/messaging-api/
  - type: Webhook OpenAPI
    url: https://raw.githubusercontent.com/line/line-openapi/main/webhook.yml
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/line/refs/heads/main/asyncapi/line-messaging-webhook.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/liff-server/
- aid: line:line-info-api
  name: LINE Info API
  description: The Info API from LINE — 1 operation(s) for info.
  humanURL: https://developers.line.biz/en/docs/messaging-api/
  baseURL: https://api.line.me
  tags:
  - Info
  properties:
  - type: OpenAPI
    url: openapi/line-info-api-openapi.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/messaging-api/
  - type: Webhook OpenAPI
    url: https://raw.githubusercontent.com/line/line-openapi/main/webhook.yml
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/line/refs/heads/main/asyncapi/line-messaging-webhook.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/liff-server/
- aid: line:line-message-api
  name: LINE Message API
  description: The Message API from LINE — 4 operation(s) for message.
  humanURL: https://developers.line.biz/en/docs/messaging-api/
  baseURL: https://api.line.me
  tags:
  - Message
  properties:
  - type: OpenAPI
    url: openapi/line-message-api-openapi.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/messaging-api/
  - type: Webhook OpenAPI
    url: https://raw.githubusercontent.com/line/line-openapi/main/webhook.yml
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/line/refs/heads/main/asyncapi/line-messaging-webhook.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/liff-server/
- aid: line:line-profile-api
  name: LINE Profile API
  description: The Profile API from LINE — 1 operation(s) for profile.
  humanURL: https://developers.line.biz/en/docs/messaging-api/
  baseURL: https://api.line.me
  tags:
  - Profile
  properties:
  - type: OpenAPI
    url: openapi/line-profile-api-openapi.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/messaging-api/
  - type: Webhook OpenAPI
    url: https://raw.githubusercontent.com/line/line-openapi/main/webhook.yml
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/line/refs/heads/main/asyncapi/line-messaging-webhook.yml
  - type: Documentation
    url: https://developers.line.biz/en/reference/liff-server/
common:
- type: AgenticAccess
  url: agentic-access/line-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/line-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/line-domain-security.yml
- type: Authentication
  url: authentication/line-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/linecorp
- type: Website
  url: https://line.me
- type: DeveloperPortal
  url: https://developers.line.biz/en/
- type: Documentation
  url: https://developers.line.biz/en/docs/
- type: OpenAPI Repository
  url: https://github.com/line/line-openapi
- type: GitHubOrganization
  url: https://github.com/line
- type: Signup
  url: https://developers.line.biz/console/
- type: Pricing
  url: https://www.linebiz.com/jp-en/service/line-account-connect/
- name: MCP Server
  url: https://github.com/line/line-bot-mcp-server
  type: MCPServer
- type: LlmsText
  url: https://developers.line.biz/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com