Clix

Clix is a US-based, developer-first mobile push notification platform for iOS, Android, React Native and Flutter — one CLI command (clix install) automates Firebase Cloud Messaging and APNs setup, and the console adds behaviour-triggered and API-triggered campaigns, real-time delivery logs, full-funnel analytics and device/user lifecycle management, priced free to 100K active devices then $30/month. For developers and agents it publishes a small REST API at https://api.clix.so (OpenAPI 3.1.0 generated from clix/external/v1/clix.proto: 11 operations across users, devices, events, messages:send, live-activities:start and campaigns/{id}:trigger, authenticated with X-Clix-Project-ID + X-Clix-API-Key), an A2A agent at https://api.clix.so/a2a whose card at /.well-known/agent-card.json is served in both 0.3.0 and 1.0 shapes and exposes four skills (create-user, track-event, send-push-notification, trigger-campaign) with idempotency keys, SSE streaming, task cancellation and task webhooks, a stdio MCP server (@clix-so/clix-mcp-server) plus a Mintlify docs MCP endpoint — both documentation-only — an open agent-skills repo, first-party SDKs on Maven Central, CocoaPods/SwiftPM, pub.dev and npm, a self-hosted status page with a published 99.5% monthly SLO, and console-configured PUSH_SENT/PUSH_FAILED webhooks.

Clix publishes 3 API contracts indexed on the APIs.io network, including Clix External Service API, and 2 more. Tagged areas include Push Notifications, Mobile, Messaging, Campaigns, and Event Tracking.

The Clix catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Clix’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, support, CLI, and 34 more developer resources.

🌐 Visit website 📡 Source on GitHub

67.8/100 exemplar ▬ flat Agent 44/100 agent ready Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

2 published contracts 1 MCP Servers

Push Notifications Mobile Messaging Campaigns Event Tracking Customer Engagement A2A MCP Agents SDK United States Company

What people ask Clix 1

The questions people put to an LLM, and the jobs they hand an agent, that Clix's APIs answer — each one linked to the operation that does it. Generated by API Evangelist

Clix Clix External Service API Register or update app devices “Can I register new app installs as devices in Clix so they can receive messages?” Link a device to a project user ID “How do I associate a device with my own user ID after someone logs in?” Set user properties via a device ID “Can I update a user's properties when I only know their device ID?” Track user events “How do I send in-app events like purchases or sign-ups to Clix?”

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 67.8/100 · exemplar

Contract Quality 10.5 / 19

Developer Ergonomics 11.8 / 15

Access Clarity 11.4 / 15

Operational Transparency 6.4 / 10

Contract Governance 1.6 / 9

Discoverability 5.6 / 8

Regulatory Posture 5.4 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 44/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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

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/.

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/clix-so: 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 3

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

Clix A2A Agent

Agent2Agent (A2A) protocol surface: a public agent card at https://api.clix.so/.well-known/agent-card.json (0.3.0 shape by default, 1.0 shape under the A2A-Version: 1.0 header; ...

Clix MCP Server

Model Context Protocol surfaces, both documentation-only: the provider's stdio server @clix-so/clix-mcp-server 0.1.4 (npx -y @clix-so/clix-mcp-server@latest; tools search_docs a...

Clix Clix External Service API

The ClixExternalService API from Clix — 10 operation(s) for clixexternalservice.

MCP Servers 1

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

Clix MCP Server

Clix has two MCP surfaces and neither one executes Clix operations — both retrieve documentation. (1) The provider-built "Clix MCP Server" is a stdio npm package, @clix-so/clix-...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Clix So Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Clix So Rate Limits

1 limits

RATE LIMITS

Event Specifications 1

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

Clix So Webhooks

ASYNCAPI

OpenAPI Overlays 2

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Clix So Clixexternalservice Api Phrasing Overlay

12 actions · phrasing · clix-so-clixexternalservice-api-openapi.yml

GENERATED

Clix So Openapi Overlay

12 actions · documentation · clix-so-openapi.yml

GENERATED

Security Posture 2

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

Clix So Authentication

apiKey · 5 schemes

SECURITY

Clix So Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

WellKnown

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Lifecycle

Conformance

Webhooks

DataModel

Scroll for all 7

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

ToolCrosswalk

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 6

Status, limits, changes, and where to get help

StatusPage

SLA

Support

ChangeLog

RateLimits

IncidentNotification

IncidentNotification

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 4

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

AgentCard

DataSubjectRequest

DataSubjectRequest

DataResidency

DataResidency

Source (apis.yml)

aid: clix-so
name: Clix
description: 'Clix is a US-based, developer-first mobile push notification platform for iOS, Android, React Native and Flutter
  — one CLI command (clix install) automates Firebase Cloud Messaging and APNs setup, and the console adds behaviour-triggered
  and API-triggered campaigns, real-time delivery logs, full-funnel analytics and device/user lifecycle management, priced
  free to 100K active devices then $30/month. For developers and agents it publishes a small REST API at https://api.clix.so
  (OpenAPI 3.1.0 generated from clix/external/v1/clix.proto: 11 operations across users, devices, events, messages:send, live-activities:start
  and campaigns/{id}:trigger, authenticated with X-Clix-Project-ID + X-Clix-API-Key), an A2A agent at https://api.clix.so/a2a
  whose card at /.well-known/agent-card.json is served in both 0.3.0 and 1.0 shapes and exposes four skills (create-user,
  track-event, send-push-notification, trigger-campaign) with idempotency keys, SSE streaming, task cancellation and task
  webhooks, a stdio MCP server (@clix-so/clix-mcp-server) plus a Mintlify docs MCP endpoint — both documentation-only — an
  open agent-skills repo, first-party SDKs on Maven Central, CocoaPods/SwiftPM, pub.dev and npm, a self-hosted status page
  with a published 99.5% monthly SLO, and console-configured PUSH_SENT/PUSH_FAILED webhooks.'
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - clix-so/clix-mcp-server
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
image: https://clix.so/opengraph-image?04675f86137dbf70
url: https://raw.githubusercontent.com/api-evangelist/clix-so/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-24
tags:
- Push Notifications
- Mobile
- Messaging
- Campaigns
- Event Tracking
- Customer Engagement
- A2A
- MCP
- Agents
- SDK
- United States
- Company
tags_raw:
- Push Notifications
- Mobile
- Messaging
- Campaigns
- Event Tracking
- Customer Engagement
- A2A
- MCP
- Agents
- SDKs
- United States
- Company
apis:
- aid: clix-so:clix-a2a-agent
  name: Clix A2A Agent
  description: 'Agent2Agent (A2A) protocol surface: a public agent card at https://api.clix.so/.well-known/agent-card.json
    (0.3.0 shape by default, 1.0 shape under the A2A-Version: 1.0 header; graded conformant) and a JSON-RPC 2.0 endpoint at
    POST https://api.clix.so/a2a authenticated with a secret X-API-Key (clix_sk_ prefix). Four built-in skills — create-user,
    track-event, send-push-notification, trigger-campaign — each a projection of one REST operation, executed as tasks with
    SendMessage / SendStreamingMessage (SSE), GetTask, ListTasks (cursor pagination), CancelTask, task webhooks (CreateTaskPushNotificationConfig)
    and an authenticated extended card. Adds what the REST layer lacks: X-Clix-Idempotency-Key replay protection with 409
    semantics and X-Request-ID tracing. The anonymous endpoint answers 401 Missing API key.'
  humanURL: https://docs.clix.so/a2a/overview
  baseURL: https://api.clix.so/a2a
  tags:
  - A2A
  - Agents
  - Agent-Native
  - Push Notifications
  tags_raw:
  - A2A
  - Agents
  - agent-native
  - Push Notifications
  properties:
  - type: AgentCard
    url: a2a/clix-so-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted)
    url: https://api.clix.so/.well-known/agent-card.json
  - type: Documentation
    url: https://docs.clix.so/a2a/overview
  - type: APIReference
    url: https://docs.clix.so/a2a/api-reference
  - type: GettingStarted
    url: https://docs.clix.so/a2a/quickstart
  - type: ToolCrosswalk
    url: mcp/clix-so-tool-crosswalk.yml
- aid: clix-so:clix-mcp-server
  name: Clix MCP Server
  description: 'Model Context Protocol surfaces, both documentation-only: the provider''s stdio server @clix-so/clix-mcp-server
    0.1.4 (npx -y @clix-so/clix-mcp-server@latest; tools search_docs and search_sdk over the docs llms.txt and the four SDK
    repos; installed by `clix mcp`), and a Mintlify-served Streamable HTTP endpoint at https://docs.clix.so/mcp that answers
    initialize and tools/list anonymously (protocol 2025-06-18; search_clix_documentation, query_docs_filesystem_clix_documentation,
    submit_feedback; resource mintlify://skills/clix). Neither executes Clix operations — the docs direct agents to A2A for
    that.'
  humanURL: https://docs.clix.so/mcp-server/clix-mcp-server
  baseURL: https://docs.clix.so/mcp
  tags:
  - MCP
  - Agents
  - Documentation
  properties:
  - type: MCPServer
    url: mcp/clix-so-mcp.yml
  - type: MCPServer
    name: Mintlify docs MCP endpoint (Streamable HTTP)
    url: https://docs.clix.so/mcp
  - type: Documentation
    url: https://docs.clix.so/mcp-server/clix-mcp-server
  - type: SourceCode
    url: https://github.com/clix-so/clix-mcp-server
  - type: ToolCrosswalk
    url: mcp/clix-so-tool-crosswalk.yml
- aid: clix-so:clix-so-clixexternalservice-api
  name: Clix Clix External Service API
  description: The ClixExternalService API from Clix — 10 operation(s) for clixexternalservice.
  humanURL: https://docs.clix.so/api-reference/overview
  baseURL: https://api.clix.so
  tags:
  - ClixExternalService
  properties:
  - type: OpenAPI
    url: openapi/clix-so-clixexternalservice-api-openapi.yml
  - type: Documentation
    url: https://docs.clix.so/api-reference/overview
  - type: APIReference
    url: https://docs.clix.so/api-reference/overview
  - type: RateLimits
    url: https://docs.clix.so/api-reference/rate-limits
  - type: Webhooks
    url: https://docs.clix.so/integrations/webhook
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/clix-so-openapi-overlay.yaml
- type: Website
  url: https://clix.so/
- type: DeveloperPortal
  url: https://docs.clix.so/
- type: Documentation
  url: https://docs.clix.so/
- type: APIReference
  url: https://docs.clix.so/api-reference/overview
- type: GettingStarted
  url: https://docs.clix.so/sdk-quickstart-ios
- type: Login
  url: https://console.clix.so/
- type: Pricing
  url: https://clix.so/pricing
- type: TermsOfService
  url: https://clix.so/terms
- type: PrivacyPolicy
  url: https://clix.so/privacy
- type: StatusPage
  url: https://clix.so/status
- type: SLA
  url: https://clix.so/availability
- type: Blog
  url: https://blog.clix.so/
- type: BlogRSS
  url: https://blog.clix.so/rss/
- type: GitHubOrganization
  url: https://github.com/clix-so
- type: Support
  url: https://docs.clix.so/troubleshooting/not-getting-push-notification
- type: LLMsTxt
  url: llms/clix-so-llms.txt
- type: LLMsTxt
  name: llms.txt (provider-hosted)
  url: https://docs.clix.so/llms.txt
- type: AgentCard
  url: a2a/clix-so-a2a.yml
- type: MCPServer
  url: mcp/clix-so-mcp.yml
- type: ToolCrosswalk
  url: mcp/clix-so-tool-crosswalk.yml
- type: WellKnown
  url: well-known/clix-so-well-known.yml
- type: Packages
  url: packages/clix-so-packages.yml
- type: SDKs
  url: packages/clix-so-packages.yml
- type: CLI
  url: cli/clix-so-cli.yml
- type: Authentication
  url: authentication/clix-so-authentication.yml
- type: Conventions
  url: conventions/clix-so-conventions.yml
- type: Idempotency
  url: conventions/clix-so-conventions.yml
- type: ErrorCatalog
  url: errors/clix-so-problem-types.yml
- type: Lifecycle
  url: lifecycle/clix-so-lifecycle.yml
- type: ChangeLog
  url: changelog/clix-so-changelog.yml
- type: Conformance
  url: conformance/clix-so-conformance.yml
- type: RateLimits
  url: rate-limits/clix-so-rate-limits.yml
- type: Plans
  url: plans/clix-so-plans-pricing.yml
- type: Webhooks
  url: asyncapi/clix-so-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/clix-so-data-model.yml
- type: DomainSecurity
  url: security/clix-so-domain-security.yml
- type: DataSubjectRequest
  url: https://clix.so/privacy
- type: DataResidency
  url: https://clix.so/availability
- type: IncidentNotification
  url: https://docs.clix.so/ops/incident-communication
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 27
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://api.clix.so/.well-known/agent-card.json
  grade: conformant
  protocol_version: 0.3.0
  control: 404

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