Churnkey

Churnkey is retention and growth infrastructure for subscription companies. It provides personalized Cancel Flows that intercept subscription cancellations with pauses, discounts, plan changes and surveys; Failed Payment Recovery (dunning) that recovers involuntary churn; and Reactivation campaigns that win back churned customers. Churnkey embeds via a JavaScript SDK authenticated with a server-computed HMAC authHash, and exposes REST APIs for session/analytics data, event tracking, customer updates, billing-contact management, and GDPR data-subject requests, plus signed webhooks. It integrates with Stripe, Chargebee, Paddle, Braintree, and Maxio.

Churnkey publishes 5 APIs on the APIs.io network, including Billing Contacts API, Customers API, Data Subject Requests API, and 2 more. Tagged areas include Churn Prevention, Retention, Cancellation Flows, Failed Payment Recovery, and Dunning.

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

🌐 Visit website 📡 Source on GitHub

37.0/100 thin ▬ flat Agent 30/100 agent ready saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessPaid

1 APIs

Churn Prevention RetentionCancellation FlowsFailed Payment RecoveryDunningReactivationSubscription Software-as-a-Service

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 37.0/100 · thin

Contract Quality 8.4 / 19

Developer Ergonomics 3.4 / 15

Access Clarity 8.7 / 15

Operational Transparency 3.3 / 10

Contract Governance 0.0 / 9

Discoverability 5.1 / 8

Regulatory Posture 4.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 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 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

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 Payments 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/churnkey: 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 7

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

Churnkey Cancel Flow Embed

Client-side embed surface for personalized Cancel Flows. The JavaScript SDK is initialized with window.churnkey.init(), passing an appId, customerId, subscriptionId, provider, a...

Churnkey Reactivation API

Reactivation (win-back) campaigns that re-engage churned or paused customers with targeted offers. Reactivations are a documented Churnkey product, but a dedicated public REST e...

Churnkey Billing Contacts API

Billing-contact management for Failed Payment Recovery.

Churnkey Customers API

Customer and B2B user attribute updates.

Churnkey Data Subject Requests API

GDPR access and deletion requests (Data API).

Churnkey Events API

Customer event tracking and passive data enrichment.

Churnkey Sessions API

Cancel Flow session data and aggregations (Data API).

Scroll for all 7

Open Collections 7

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

API Collection

OPEN COLLECTION

Churnkey Billing Contacts API

OPEN COLLECTION

Churnkey Billing Contacts Customers API

OPEN COLLECTION

Churnkey Billing Contacts Data Subject Requests API

OPEN COLLECTION

Churnkey Billing Contacts Events API

OPEN COLLECTION

Churnkey Billing Contacts Sessions API

OPEN COLLECTION

Churnkey API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Churnkey Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Churnkey Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

Churnkey Finops

FINOPS

Security Posture 3

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

Churnkey Authentication

apiKey · 2 schemes

SECURITY

Churnkey Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Churnkey Trust Center

SOC 2, GDPR

SECURITY

Agentic Access 1

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

Churnkey Agentic Access

9 operations · 7 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 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

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

Plans

Plans

FinOps

FinOps

Pricing

Pricing

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: churnkey
url: https://raw.githubusercontent.com/api-evangelist/churnkey/refs/heads/main/apis.yml
name: Churnkey
kind: company
description: Churnkey is retention and growth infrastructure for subscription companies. It provides personalized Cancel Flows
  that intercept subscription cancellations with pauses, discounts, plan changes and surveys; Failed Payment Recovery (dunning)
  that recovers involuntary churn; and Reactivation campaigns that win back churned customers. Churnkey embeds via a JavaScript
  SDK authenticated with a server-computed HMAC authHash, and exposes REST APIs for session/analytics data, event tracking,
  customer updates, billing-contact management, and GDPR data-subject requests, plus signed webhooks. It integrates with Stripe,
  Chargebee, Paddle, Braintree, and Maxio.
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: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/churnkey.png
tags:
- Churn Prevention
- Retention
- Cancellation Flows
- Failed Payment Recovery
- Dunning
- Reactivation
- Subscription
- Software-as-a-Service
tags_raw:
- Churn Prevention
- Retention
- Cancellation Flows
- Failed Payment Recovery
- Dunning
- Reactivation
- Subscriptions
- SaaS
created: '2026-07-10'
modified: '2026-07-10'
specificationVersion: '0.23'
apis:
- aid: churnkey:churnkey-cancel-flow-embed
  name: Churnkey Cancel Flow Embed
  tags:
  - Cancel Flows
  - Embed
  - HMAC Auth
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.churnkey.co/installing-churnkey
  baseURL: https://api.churnkey.co/v1
  properties:
  - url: https://docs.churnkey.co/installing-churnkey
    type: Documentation
  - url: https://docs.churnkey.co/integrations/general/
    type: Documentation
  description: Client-side embed surface for personalized Cancel Flows. The JavaScript SDK is initialized with window.churnkey.init(),
    passing an appId, customerId, subscriptionId, provider, and a server-computed HMAC-SHA256 authHash (the customer ID signed
    with the Cancel Flow API key) so the hosted flow can be trusted. This is a client SDK plus HMAC authorization surface
    rather than a REST resource API.
- aid: churnkey:churnkey-reactivation-api
  name: Churnkey Reactivation API
  tags:
  - Reactivation
  - Win-back
  - Campaigns
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://churnkey.co/feature/reactivations
  baseURL: https://api.churnkey.co/v1
  properties:
  - url: https://churnkey.co/feature/reactivations
    type: Documentation
  description: Reactivation (win-back) campaigns that re-engage churned or paused customers with targeted offers. Reactivations
    are a documented Churnkey product, but a dedicated public REST endpoint set is not published; campaigns are configured
    in the Churnkey dashboard and driven by the same customer/event data surfaced through the Event Tracking and Data APIs.
    Endpoints here are modeled, not confirmed from public reference documentation.
- aid: churnkey:churnkey-billing-contacts-api
  name: Churnkey Billing Contacts API
  description: Billing-contact management for Failed Payment Recovery.
  humanURL: https://docs.churnkey.co/data-api
  baseURL: https://api.churnkey.co/v1/data
  tags:
  - Billing Contacts
  properties:
  - type: OpenAPI
    url: openapi/churnkey-billing-contacts-api-openapi.yml
  - type: Documentation
    url: https://docs.churnkey.co/data-api
  - type: PostmanCollection
    url: collections/churnkey.postman_collection.json
  - type: OpenCollection
    url: collections/churnkey.opencollection.json
  - type: Documentation
    url: https://docs.churnkey.co/data-integrations/event-tracking/
  - type: Documentation
    url: https://docs.churnkey.co/failed-payment-recovery/billing-contact-api/
- aid: churnkey:churnkey-customers-api
  name: Churnkey Customers API
  description: Customer and B2B user attribute updates.
  humanURL: https://docs.churnkey.co/data-api
  baseURL: https://api.churnkey.co/v1/data
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/churnkey-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.churnkey.co/data-api
  - type: PostmanCollection
    url: collections/churnkey.postman_collection.json
  - type: OpenCollection
    url: collections/churnkey.opencollection.json
  - type: Documentation
    url: https://docs.churnkey.co/data-integrations/event-tracking/
  - type: Documentation
    url: https://docs.churnkey.co/failed-payment-recovery/billing-contact-api/
- aid: churnkey:churnkey-data-subject-requests-api
  name: Churnkey Data Subject Requests API
  description: GDPR access and deletion requests (Data API).
  humanURL: https://docs.churnkey.co/data-api
  baseURL: https://api.churnkey.co/v1/data
  tags:
  - Data Subject Requests
  properties:
  - type: OpenAPI
    url: openapi/churnkey-data-subject-requests-api-openapi.yml
  - type: Documentation
    url: https://docs.churnkey.co/data-api
  - type: PostmanCollection
    url: collections/churnkey.postman_collection.json
  - type: OpenCollection
    url: collections/churnkey.opencollection.json
  - type: Documentation
    url: https://docs.churnkey.co/data-integrations/event-tracking/
  - type: Documentation
    url: https://docs.churnkey.co/failed-payment-recovery/billing-contact-api/
- aid: churnkey:churnkey-events-api
  name: Churnkey Events API
  description: Customer event tracking and passive data enrichment.
  humanURL: https://docs.churnkey.co/data-api
  baseURL: https://api.churnkey.co/v1/data
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/churnkey-events-api-openapi.yml
  - type: Documentation
    url: https://docs.churnkey.co/data-api
  - type: PostmanCollection
    url: collections/churnkey.postman_collection.json
  - type: OpenCollection
    url: collections/churnkey.opencollection.json
  - type: Documentation
    url: https://docs.churnkey.co/data-integrations/event-tracking/
  - type: Documentation
    url: https://docs.churnkey.co/failed-payment-recovery/billing-contact-api/
- aid: churnkey:churnkey-sessions-api
  name: Churnkey Sessions API
  description: Cancel Flow session data and aggregations (Data API).
  humanURL: https://docs.churnkey.co/data-api
  baseURL: https://api.churnkey.co/v1/data
  tags:
  - Sessions
  properties:
  - type: OpenAPI
    url: openapi/churnkey-sessions-api-openapi.yml
  - type: Documentation
    url: https://docs.churnkey.co/data-api
  - type: PostmanCollection
    url: collections/churnkey.postman_collection.json
  - type: OpenCollection
    url: collections/churnkey.opencollection.json
  - type: Documentation
    url: https://docs.churnkey.co/data-integrations/event-tracking/
  - type: Documentation
    url: https://docs.churnkey.co/failed-payment-recovery/billing-contact-api/
common:
- type: AgenticAccess
  url: agentic-access/churnkey-agentic-access.yml
- type: TrustCenter
  url: security/churnkey-trust-center.yml
- type: DomainSecurity
  url: security/churnkey-domain-security.yml
- type: Authentication
  url: authentication/churnkey-authentication.yml
- type: GitHubOrganization
  url: https://github.com/churnkey
- type: LinkedIn
  url: https://www.linkedin.com/company/churnkey
- type: Website
  url: https://churnkey.co
- type: Documentation
  url: https://docs.churnkey.co
- type: Plans
  url: plans/churnkey-plans-pricing.yml
- type: RateLimits
  url: rate-limits/churnkey-rate-limits.yml
- type: FinOps
  url: finops/churnkey-finops.yml
- type: Pricing
  url: https://churnkey.co/pricing
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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