Kustomer website screenshot

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 pricing, authentication, documentation, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
30.7/100 thin ▬ flat Agent 19/100 agent aware Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
1 APIs
Customer ServiceCRMHelp DeskMessagingArtificial IntelligenceConversational AI

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Customer Service Management
BC-430
Conversations
POST /v1/conversations
Customer Relationship Management
BC-420
Customers
POST /v1/customers

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 30.7/100 · thin
Contract Quality 11.0 / 19
Developer Ergonomics 2.0 / 15
Access Clarity 2.8 / 15
Operational Transparency 0.8 / 10
Contract Governance 1.2 / 9
Discoverability 4.3 / 8
Regulatory Posture 1.6 / 15
Create-or-Update Ergonomics 2.8 / 10
Agent readiness — 19/100 · 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
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/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 →

What adopting Kustomer moves on the Kin Score 4

Kustomer is an area vendor: providers adopt it to run part of their developer surface. This is the Kin Score checks its features can move for a provider that adopts it, what each one really earns, and what it earns nothing for.

supportcapability map3 features checked 2026-09-25 · rubric v0.22.0

Kustomer earns a provider a declared support channel (2 points) and an llms.txt: its knowledge base serves /llms.txt and a Markdown copy of each article, generated from the provider’s own articles, worth llms_txt_published (4 points) on the provider’s custom domain once declared. The generated file can carry placeholder titling (“# default”) when the brand is left unnamed, so it is real but not curated. Getting-started and authentication pages count only if the provider writes them.

Developer Ergonomics12.0 of 42 pts
Discoverability4.0 of 54 pts
CheckEarnsThrough
Authentication documentedsaturated
Developer ErgonomicsOnly if the provider documents its API authentication in a knowledge-base article and declares it as Authentication.		 5.0 of 5 Knowledge base
Publishes llms.txt
DiscoverabilityGenerated by Kustomer from the provider’s own articles; on the provider’s custom domain the format’s first-party exception applies. On the Kustomer-provided host it would be a vendor-domain, derived (0.25) artifact. It indexes support articles, not API docs.		 4.0 of 4 Generated llms.txt and Markdown article twins
Support channel
Developer ErgonomicsDeclare the knowledge base in apis.yml common[] as HelpCenter or Support.		 2.0 of 2 Knowledge base
Getting started guideconditional
Developer ErgonomicsOnly if the provider writes a getting-started guide for its API as a knowledge-base article and declares it as GettingStarted.		 5.0 of 5 Knowledge base
Across 8977 providers that publish a contract, adopting Kustomer would move 5745. Median lift: composite +0.8 (90th percentile +1.7), agent readiness +0.0 (+0.0). Conditional rows excluded.
What Kustomer ships that earns nothing (1)
  • Knowledge base custom domain — No check reads the host of a support pointer; its only scoring effect is making the llms.txt row first-party.

A model, not a score. Adopting this vendor changes a provider's Kin Score only when the provider publishes the resulting artifacts on its own surface; nothing here writes a score, and no sponsorship or partnership can. The rating is not for sale → · Full vendor facets artifact

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

Pricing Plans 1

Published pricing tiers and plan structures.

Kustomer Plans Pricing

0 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

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 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

VendorFacets
VendorFacets
 CapabilityMap
CapabilityMap

Source (apis.yml)

apis.yml Raw ↑ 
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
- Conversational AI
tags_raw:
- Customer Service
- CRM
- Helpdesk
- Messaging
- AI
- Conversational 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
- 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
common:
- type: VendorFacets
  url: vendor-facets/kustomer-vendor-facets.yml
- type: Pricing
  url: https://www.kustomer.com/pricing/
- 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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