ProsperStack

ProsperStack provides a customer retention platform for subscription businesses, offering tools to measure, test, and optimize retention performance. The service includes analytics, automated experiments, and actionable insights to help businesses reduce churn and increase revenue.

ProsperStack publishes 11 API contracts indexed on the APIs.io network, including Customer Portal API, Events API, Flow Sessions API, and 8 more. Tagged areas include Company, Retention, Subscription, Analytics, and SaaS.

The ProsperStack catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

ProsperStack’s developer surface includes pricing, engineering blog, documentation, authentication, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.3/100 developing Agent 30/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 2 Agent Skills

Company Retention Subscription AnalyticsSaaS

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 48.3/100 · developing

Contract Quality 14.2 / 21

Developer Ergonomics 5.6 / 17

Access Clarity 10.7 / 17

Operational Transparency 1.5 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 30/100 · agent ready

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 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 32.7 — up to +13.5 composite points
Operational Transparency scores 13.2 — up to +11.3 composite points
Contract Governance scores 22.0 — up to +9.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/prosperstack/apis.yml: open an issue on github.com/api-evangelist/prosperstack to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 11

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

ProsperStack Customer Portal API

The [customer portal](https://docs.prosperstack.com/customer-portal/enabling-the-customer-portal) allows customers to self-manage their subscriptions and billing details. Creati...

ProsperStack Events API

An event represents a ProsperStack event that occurred in your account. These are the same events that are delivered via configured webhooks. The events endpoints can be used as...

ProsperStack Flow Sessions API

A flow session represents the session a cancelling subscriber took when going through the ProsperStack cancellation flow, including answers to survey questions and any offers pr...

ProsperStack Flows API

A flow represents a ProsperStack cancellation flow.

ProsperStack Offer Links API

An offer link is a unique URL associating a landing page offer with a particular subscription. [Learn more.](https://docs.prosperstack.com/offers/offer-links)

ProsperStack Offers API

An offer represents a [ProsperStack offer](https://docs.prosperstack.com/offers/creating-an-offer). Offers can be of type `coupon`, `pause_subscription`, `trial_extension`, `cha...

ProsperStack Payments API

A payment represents a retained payment made by a saved or deflected subscriber. Payments can be of type `saved` or `deflected`.

ProsperStack Properties API

A property represents a [ProsperStack custom property](https://prosperstack.com/docs/custom-properties/) defined for subscribers or subscriptions. Properties can be used to stor...

ProsperStack Subscribers API

A subscriber represents a customer of your product.

ProsperStack Subscriptions API

A subscription represents a subscription belonging to a customer of your product.

ProsperStack Webhooks API

A webhook represents a [ProsperStack webhook](https://prosperstack.com/docs/webhooks/) that delivers events to a specified endpoint. Supported events are `flow_session_started` ...

Scroll for all 11

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

prosperstack-offer-links-create-and-retrieve

AGENT SKILL

prosperstack-webhook-management

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Prosperstack Plans Pricing

3 plans

PLANS

Event Specifications 1

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

Prosperstack Webhooks

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Prosperstack Context

50 classes · 77 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

ProsperStack API Rules

15 rules · 13 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Prosperstack Openapi Overlay

0 actions · update

DERIVED

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

FlowSession

18 properties

JSON SCHEMA

OfferLink

8 properties

JSON SCHEMA

Offer

9 properties

JSON SCHEMA

Payment

10 properties

JSON SCHEMA

Subscriber

9 properties

JSON SCHEMA

Subscription

9 properties

JSON SCHEMA

Security Posture 2

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

Prosperstack Authentication

http · 1 scheme

SECURITY

Prosperstack Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Prosperstack Agentic Access

29 operations · 9 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

LLMsTxt

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

ErrorCatalog

Conformance

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: prosperstack
name: ProsperStack
description: ProsperStack provides a customer retention platform for subscription businesses, offering tools to measure, test,
  and optimize retention performance. The service includes analytics, automated experiments, and actionable insights to help
  businesses reduce churn and increase revenue.
image: https://prosperstack.com/logo.png
url: https://raw.githubusercontent.com/api-evangelist/prosperstack/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-26 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-26'
modified: '2026-10-26'
tags:
- Company
- Retention
- Subscription
- Analytics
- SaaS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/prosperstack-agentic-access.yml
- type: Plans
  url: plans/prosperstack-plans-pricing.yml
- type: Spectral
  url: rules/prosperstack-rules.yml
- type: JSONLD
  url: json-ld/prosperstack-context.jsonld
- type: Vocabulary
  url: vocabulary/prosperstack-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/prosperstack-webhooks.yml
- type: DataModel
  url: data-model/prosperstack-data-model.yml
- type: ErrorCatalog
  url: errors/prosperstack-problem-types.yml
- type: Conformance
  url: conformance/prosperstack-conformance.yml
- type: Overlay
  url: overlays/prosperstack-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/prosperstack-llms.txt
- type: Hosts
  url: hosts/prosperstack-hosts.yml
- type: Vendors
  url: vendors/prosperstack-vendors.yml
- type: SDKs
  url: packages/prosperstack-packages.yml
- type: Packages
  url: packages/prosperstack-packages.yml
- type: TermsOfService
  url: https://prosperstack.com/terms-of-service/
- type: PrivacyPolicy
  url: https://prosperstack.com/privacy-policy/
- type: Pricing
  url: https://prosperstack.com/pricing/
- type: Blog
  url: https://prosperstack.com/blog/
- type: Documentation
  url: https://developers.prosperstack.com/
- type: GitHubOrganization
  url: https://github.com/prosperstack
- type: Authentication
  url: authentication/prosperstack-authentication.yml
- type: DomainSecurity
  url: security/prosperstack-domain-security.yml
- type: Website
  url: https://prosperstack.com/
apis:
- aid: prosperstack:prosperstack-customer-portal-api
  name: ProsperStack Customer Portal API
  description: 'The [customer portal](https://docs.prosperstack.com/customer-portal/enabling-the-customer-portal) allows customers
    to self-manage their subscriptions and billing details.


    Creating a portal session creates a unique URL for a specific customer. Create sessions via the API to seamlessly log
    customers in to the portal directly from your application or website.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - customer_portal
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-customer-portal-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-events-api
  name: ProsperStack Events API
  description: 'An event represents a ProsperStack event that occurred in your account. These are the same events that are
    delivered via configured webhooks.


    The events endpoints can be used as an alternative or in addition to [webhooks](https://prosperstack.com/docs/webhooks/).
    Use the events endpoints if you would like to poll for new events rather than receiving them in real-time, or to catch
    up on any events a webhook endpoint may have missed.


    Use the event `id` property to determine if your application has handled the event before.


    Note that the events endpoints are only guaranteed to maintain event history for 30 days.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - events
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-events-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-flow-sessions-api
  name: ProsperStack Flow Sessions API
  description: A flow session represents the session a cancelling subscriber took when going through the ProsperStack cancellation
    flow, including answers to survey questions and any offers presented or accepted.
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - flow_sessions
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-flow-sessions-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-flows-api
  name: ProsperStack Flows API
  description: A flow represents a ProsperStack cancellation flow.
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - flows
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-flows-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-offer-links-api
  name: ProsperStack Offer Links API
  description: An offer link is a unique URL associating a landing page offer with a particular subscription. [Learn more.](https://docs.prosperstack.com/offers/offer-links)
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - offer-links
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-offer-links-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-offers-api
  name: ProsperStack Offers API
  description: 'An offer represents a [ProsperStack offer](https://docs.prosperstack.com/offers/creating-an-offer).


    Offers can be of type `coupon`, `pause_subscription`, `trial_extension`, `change_plan` or `custom`.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - offers
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-offers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-payments-api
  name: ProsperStack Payments API
  description: 'A payment represents a retained payment made by a saved or deflected subscriber.


    Payments can be of type `saved` or `deflected`.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - payments
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-payments-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-properties-api
  name: ProsperStack Properties API
  description: 'A property represents a [ProsperStack custom property](https://prosperstack.com/docs/custom-properties/) defined
    for subscribers or subscriptions.


    Properties can be used to store custom data with your subscribers and subscriptions. They can be of type `text`, `number`,
    `boolean` or `date`.


    Each custom property must be attached to either the `subscriber` or `subscription` entity type.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - properties
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-properties-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-subscribers-api
  name: ProsperStack Subscribers API
  description: A subscriber represents a customer of your product.
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - subscribers
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-subscribers-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-subscriptions-api
  name: ProsperStack Subscriptions API
  description: A subscription represents a subscription belonging to a customer of your product.
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - subscriptions
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-subscriptions-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
- aid: prosperstack:prosperstack-webhooks-api
  name: ProsperStack Webhooks API
  description: 'A webhook represents a [ProsperStack webhook](https://prosperstack.com/docs/webhooks/) that delivers events
    to a specified endpoint.


    Supported events are `flow_session_started` and `flow_session_completed`.


    A ProsperStack account can have a maximum of ten configured webhooks.'
  humanURL: https://developers.prosperstack.com/
  baseURL: https://api.prosperstack.com/v1
  tags:
  - webhooks
  properties:
  - type: OpenAPI
    url: openapi/prosperstack-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/prosperstack-flow-session-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscriber-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-subscription-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-offer-link-schema.json
  - type: JSONSchema
    url: json-schema/prosperstack-payment-schema.json
x-submission-probe: 200 2026-10-25
x-enrichment:
  date: '2026-10-26'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

ProsperStack API — frequently asked questions

Does ProsperStack have an API?

Yes. APIs.io lists 11 APIs from ProsperStack, including ProsperStack Customer Portal API, ProsperStack Events API and ProsperStack Flow Sessions API, and 8 more.

Is there an OpenAPI specification for the ProsperStack API?

Yes. APIs.io indexes 11 OpenAPI specifications for ProsperStack, each linked for download from this page.

How do I authenticate with the ProsperStack API?

ProsperStack uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Prosperstack Authentication.

How much does the ProsperStack API cost?

APIs.io lists 3 pricing plans for ProsperStack, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the ProsperStack API ready for AI agents?

ProsperStack has a Kin Score of 48.3 out of 100 (developing) and an Agent Readiness score of 30.1 (agent-ready), scored by API Evangelist on 2026-10-31.

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