Kustomer

Kustomer is an AI-powered customer service CRM that unifies conversations, customer data, automation, and reporting across channels.

Kustomer publishes 2 APIs on the APIs.io network: Conversations API and Customers API. Tagged areas include Customer Service, CRM, Help Desk, Messaging, and Artificial Intelligence.

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

Kustomer’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.0/100 thin ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Customer Service CRM Help Desk Messaging Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 33.0/100 · thin

Contract Quality 15.4 / 23

Developer Ergonomics 2.4 / 18

Access Clarity 2.4 / 18

Operational Transparency 0.9 / 12

Contract Governance 1.5 / 11

Discoverability 5.3 / 9

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 21/100 · 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 0 / 7

Rate-Limit Signaling 7 / 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

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/kustomer: 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 2

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

Kustomer Conversations API

Conversation threads with customers

Kustomer Customers API

Customer records in Kustomer

Open Collections 4

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

API Collection

OPEN COLLECTION

Kustomer REST Conversations API

OPEN COLLECTION

Kustomer REST Conversations Customers API

OPEN COLLECTION

Kustomer REST API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Kustomer GraphQL Schema

This document describes the conceptual GraphQL schema for the Kustomer AI-native CRM and customer service platform. Kustomer exposes a REST API at `https://api.kustomerapp.com` ...

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Kustomer Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kustomer Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Kustomer Finops

FINOPS

Event Specifications 1

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

Kustomer Outbound Webhook Events

Kustomer's outbound webhook surface delivers event notifications when resources in a Kustomer organization are created or updated. Apps subscribe to a configured array of event ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Kustomer API Rules

7 rules · 1 errors 5 warnings 1 info

SPECTRAL

Security Posture 2

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

Kustomer Authentication

http · 1 scheme

SECURITY

Kustomer Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Kustomer Agentic Access

2 operations · 2 acting

AGENTIC

Resources

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 1

SDKs, sample code, and the tooling you integrate with

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 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: kustomer
url: https://raw.githubusercontent.com/api-evangelist/kustomer/refs/heads/main/apis.yml
name: Kustomer
kind: company
description: Kustomer is an AI-powered customer service CRM that unifies conversations, customer data, automation, and reporting
  across channels.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/kustomer.png
tags:
- Customer Service
- CRM
- Help Desk
- Messaging
- Artificial Intelligence
tags_raw:
- Customer Service
- CRM
- Helpdesk
- Messaging
- AI
created: '2026-05-08'
modified: '2026-05-30'
specificationVersion: '0.23'
apis:
- aid: kustomer:kustomer-conversations-api
  name: Kustomer Conversations API
  description: Conversation threads with customers
  humanURL: https://developer.kustomer.com/kustomer-api-docs/reference
  baseURL: https://api.kustomerapp.com
  tags:
  - Conversations
  properties:
  - type: OpenAPI
    url: openapi/kustomer-conversations-api-openapi.yml
  - type: Documentation
    url: https://developer.kustomer.com/kustomer-api-docs/reference
  - type: Authentication
    url: https://developer.kustomer.com/kustomer-api-docs/reference/authentication
  - type: AsyncAPI
    url: asyncapi/kustomer-webhooks-asyncapi.yml
  - type: GraphQL
    url: graphql/kustomer-graphql.md
- aid: kustomer:kustomer-customers-api
  name: Kustomer Customers API
  description: Customer records in Kustomer
  humanURL: https://developer.kustomer.com/kustomer-api-docs/reference
  baseURL: https://api.kustomerapp.com
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/kustomer-customers-api-openapi.yml
  - type: Documentation
    url: https://developer.kustomer.com/kustomer-api-docs/reference
  - type: Authentication
    url: https://developer.kustomer.com/kustomer-api-docs/reference/authentication
  - type: AsyncAPI
    url: asyncapi/kustomer-webhooks-asyncapi.yml
  - type: GraphQL
    url: graphql/kustomer-graphql.md
common:
- type: CapabilityMap
  url: capabilities/kustomer-capability-edges.yml
  name: Kustomer Business Capability Map
- type: AgenticAccess
  url: agentic-access/kustomer-agentic-access.yml
- type: DomainSecurity
  url: security/kustomer-domain-security.yml
- type: Authentication
  url: authentication/kustomer-authentication.yml
- type: GitHubOrganization
  url: https://github.com/kustomer
- type: LinkedIn
  url: https://www.linkedin.com/company/kustomer
- type: Website
  url: https://www.kustomer.com/
- type: Documentation
  url: https://developer.kustomer.com/kustomer-api-docs/reference
- type: Plans
  url: plans/kustomer-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kustomer-rate-limits.yml
- type: FinOps
  url: finops/kustomer-finops.yml
- url: https://www.kustomer.com/resources/blog/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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