CustomerOS

CustomerOS (formerly Openline) is an open-source go-to-market / revenue platform for B2B SaaS. Its core open-source application server, customer-os-api, exposes a single GraphQL endpoint (POST /query) covering organizations, contacts, opportunities, contracts, invoices, interactions, and timeline events. The commercial cloud (customeros.ai) adds a documented REST "Customerbase" API and a JavaScript website visitor tracker, with broader access granted on a per-request basis.

CustomerOS publishes 1 API on the APIs.io network: GraphQL API. Tagged areas include CRM, Revenue, Go-To-Market, GraphQL, and Open Source.

CustomerOS’s developer surface includes authentication, documentation, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

36.0/100 thin ▬ flat Agent 37/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemiumSelf serve⚡ Free to try

3 APIs

CRMRevenueGo-To-MarketGraphQLOpen Source

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 36.0/100 · thin

Contract Quality 15.5 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 5.8 / 20

Operational Transparency 3.4 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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

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/customeros: 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 3

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

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Customeros Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

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 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: customeros
url: https://raw.githubusercontent.com/api-evangelist/customeros/refs/heads/main/apis.yml
name: CustomerOS
kind: company
description: CustomerOS (formerly Openline) is an open-source go-to-market / revenue platform for B2B SaaS. Its core open-source
  application server, customer-os-api, exposes a single GraphQL endpoint (POST /query) covering organizations, contacts, opportunities,
  contracts, invoices, interactions, and timeline events. The commercial cloud (customeros.ai) adds a documented REST "Customerbase"
  API and a JavaScript website visitor tracker, with broader access granted on a per-request basis.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/customeros.png
tags:
- CRM
- Revenue
- Go-To-Market
- GraphQL
- Open Source
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: customeros:customeros-customerbase-rest-api
  name: CustomerOS Customerbase REST API
  tags:
  - REST
  - Customerbase
  - Organizations
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customeros.ai/api-overview
  baseURL: https://api.customeros.ai/customerbase/v1
  properties:
  - url: https://docs.customeros.ai/api-overview
    type: Documentation
  - url: https://docs.customeros.ai/api-descriptions
    type: APIReference
  description: Documented synchronous REST API on the customeros.ai cloud (api.customeros.ai/customerbase/v1), authenticated
    with the X-CUSTOMER-OS-API-KEY header. Includes organization endpoints such as POST /organizations. Access to each endpoint
    group is granted on a per-request basis by the CustomerOS team.
- aid: customeros:customeros-website-tracker
  name: CustomerOS Website Tracker
  tags:
  - Tracking
  - Visitor Identification
  - JavaScript
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customeros.ai/website-tracker
  baseURL: https://docs.customeros.ai/tracker
  properties:
  - url: https://docs.customeros.ai/website-tracker
    type: Documentation
  - url: https://docs.customeros.ai/tracker/custom-events
    type: Documentation
  description: Client-side JavaScript tracker, installed via a script tag behind a customer-hosted reverse-proxy CNAME, that
    captures page views and custom events and matches visitor IPs to companies. It is a script integration rather than a public
    REST/GraphQL endpoint; custom events are emitted from the browser.
- aid: customeros:customeros-graphql-api
  name: CustomerOS GraphQL API
  description: Single GraphQL endpoint for all CustomerOS operations.
  humanURL: https://github.com/openline-ai/openline-customer-os
  baseURL: https://api.customeros.ai/query
  tags:
  - GraphQL
  properties:
  - type: OpenAPI
    url: openapi/customeros-graphql-api-openapi.yml
  - type: Documentation
    url: https://docs.customeros.ai
  - type: GitHub
    url: https://github.com/openline-ai/openline-customer-os
  - type: GraphQL
    url: graphql/customeros-graphql.md
  - type: Documentation
    url: https://docs.customeros.ai/data-structure
  - type: Documentation
    url: https://docs.customeros.ai/contacts
common:
- type: AgenticAccess
  url: agentic-access/customeros-agentic-access.yml
- type: DomainSecurity
  url: security/customeros-domain-security.yml
- type: Authentication
  url: authentication/customeros-authentication.yml
- type: GitHubOrganization
  url: https://github.com/openline-ai
- type: GitHubOrganization
  url: https://github.com/customeros
- type: LinkedIn
  url: https://www.linkedin.com/company/customeros
- type: Website
  url: https://customeros.ai
- type: Documentation
  url: https://docs.customeros.ai
- type: Plans
  url: plans/customeros-plans-pricing.yml
- type: RateLimits
  url: rate-limits/customeros-rate-limits.yml
- type: FinOps
  url: finops/customeros-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

CustomerOS

Kin Score

APIs 3

CustomerOS Customerbase REST API

CustomerOS Website Tracker

CustomerOS GraphQL API

Open Collections 1

CustomerOS GraphQL API

GraphQL 1

CustomerOS GraphQL Schema

Pricing Plans 1

Customeros Plans Pricing

Rate Limits 1

Customeros Rate Limits

FinOps 1

Customeros Finops

Security Posture 2

Customeros Authentication

Customeros Domain Security

Agentic Access 1

Customeros Agentic Access

Resources