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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.

7 APIs 0 Features
CRMRevenueGo-To-MarketGraphQLOpen Source

APIs

CustomerOS GraphQL Core API

Single-endpoint GraphQL API (POST /query) served by the open-source customer-os-api server. Exposes Query and Mutation operations across organizations, contacts, opportunities, ...

CustomerOS Organizations API

GraphQL queries and mutations for company / organization records - organization, organizations, organization_Save, organization_Merge, subsidiaries, domains, social media, and o...

CustomerOS Contacts API

GraphQL queries and mutations for contacts (people) - contact, contacts, contact_ByEmail, contact_ByLinkedIn, contact_Create, contact_CreateForOrganization, job roles, emails, p...

CustomerOS Opportunities API

GraphQL queries and mutations for sales opportunities and renewals - opportunity, opportunities_LinkedToOrganizations, opportunity_Save, opportunity_Archive, and renewal likelih...

CustomerOS Interactions API

GraphQL queries and mutations for interaction events, interaction sessions, meetings, notes, log entries, issues, and the per-organization timeline of touchpoints - over the cus...

CustomerOS Customerbase REST API

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 endpoi...

CustomerOS Website Tracker

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 co...

Resources

👥
GitHubOrganization
GitHubOrganization
👥
GitHubOrganization
GitHubOrganization
🔗
LinkedIn
LinkedIn
🔗
Website
Website
🔗
Documentation
Documentation
🔗
Plans
Plans
🔗
RateLimits
RateLimits
🔗
FinOps
FinOps

Sources

Raw ↑ 
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.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- CRM
- Revenue
- Go-To-Market
- GraphQL
- Open Source
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: customeros:customeros-graphql-core-api
  name: CustomerOS GraphQL Core API
  tags:
  - GraphQL
  - Organizations
  - Contacts
  - Opportunities
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/openline-ai/openline-customer-os
  baseURL: https://api.customeros.ai/query
  properties:
  - url: https://docs.customeros.ai
    type: Documentation
  - url: https://github.com/openline-ai/openline-customer-os
    type: GitHub
  - url: graphql/customeros-graphql.md
    type: GraphQL
  - url: openapi/customeros-openapi.yml
    type: OpenAPI
  description: Single-endpoint GraphQL API (POST /query) served by the open-source
    customer-os-api server. Exposes Query and Mutation operations across organizations,
    contacts, opportunities, contracts, invoices, interactions, and timeline events,
    authenticated per tenant with an API key. A GraphQL playground is exposed at
    /playground when enabled.
- aid: customeros:customeros-organizations-api
  name: CustomerOS Organizations API
  tags:
  - GraphQL
  - Organizations
  - Companies
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customeros.ai/data-structure
  baseURL: https://api.customeros.ai/query
  properties:
  - url: https://docs.customeros.ai/data-structure
    type: Documentation
  - url: graphql/customeros-graphql.md
    type: GraphQL
  - url: openapi/customeros-openapi.yml
    type: OpenAPI
  description: GraphQL queries and mutations for company / organization records -
    organization, organizations, organization_Save, organization_Merge, subsidiaries,
    domains, social media, and onboarding status - over the customer-os-api /query
    endpoint.
- aid: customeros:customeros-contacts-api
  name: CustomerOS Contacts API
  tags:
  - GraphQL
  - Contacts
  - People
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customeros.ai/contacts
  baseURL: https://api.customeros.ai/query
  properties:
  - url: https://docs.customeros.ai/contacts
    type: Documentation
  - url: graphql/customeros-graphql.md
    type: GraphQL
  - url: openapi/customeros-openapi.yml
    type: OpenAPI
  description: GraphQL queries and mutations for contacts (people) - contact,
    contacts, contact_ByEmail, contact_ByLinkedIn, contact_Create,
    contact_CreateForOrganization, job roles, emails, phone numbers, and social
    profiles - over the customer-os-api /query endpoint.
- aid: customeros:customeros-opportunities-api
  name: CustomerOS Opportunities API
  tags:
  - GraphQL
  - Opportunities
  - Pipeline
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/openline-ai/openline-customer-os
  baseURL: https://api.customeros.ai/query
  properties:
  - url: https://github.com/openline-ai/openline-customer-os
    type: GitHub
  - url: graphql/customeros-graphql.md
    type: GraphQL
  - url: openapi/customeros-openapi.yml
    type: OpenAPI
  description: GraphQL queries and mutations for sales opportunities and renewals -
    opportunity, opportunities_LinkedToOrganizations, opportunity_Save,
    opportunity_Archive, and renewal likelihood / forecast updates - over the
    customer-os-api /query endpoint.
- aid: customeros:customeros-interactions-api
  name: CustomerOS Interactions API
  tags:
  - GraphQL
  - Interactions
  - Timeline
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/openline-ai/openline-customer-os
  baseURL: https://api.customeros.ai/query
  properties:
  - url: https://github.com/openline-ai/openline-customer-os
    type: GitHub
  - url: graphql/customeros-graphql.md
    type: GraphQL
  - url: openapi/customeros-openapi.yml
    type: OpenAPI
  description: GraphQL queries and mutations for interaction events, interaction
    sessions, meetings, notes, log entries, issues, and the per-organization
    timeline of touchpoints - over the customer-os-api /query endpoint.
- 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.
common:
- 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