Memberstack

Memberstack provides a membership and authentication platform for Webflow, WordPress, and custom sites, enabling user sign‑ups, social logins, gated content, and Stripe payment integration, with no hidden fees and scalable pricing as businesses grow.

Memberstack is listed with 2 APIs on the APIs.io network. Tagged areas include Membership, Webflow, SaaS, Authentication, and Payments.

The Memberstack catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Memberstack’s developer surface includes changelog, authentication, support, getting-started guide, engineering blog, pricing, signup flow, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

43.3/100 developing Agent 27/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Membership WebflowSaaSAuthentication Payments

Kin Score

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

Composite quality — 43.3/100 · developing

Contract Quality 5.5 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 7.6 / 17

Operational Transparency 5.5 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.6 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 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 0 / 5

Distinct Operations 3 / 3

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 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/memberstack/"><img src="https://apis.io/badge/memberstack/card.svg" alt="Memberstack on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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)

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 25.8 — up to +18.6 composite points
Access Clarity scores 44.7 — up to +11.1 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/memberstack/apis.yml: open an issue on github.com/api-evangelist/memberstack 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 2

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

Admin REST API

Server-side Memberstack Admin REST API for managing members, verifying tokens, and other administrative tasks.

Memberstack API

Memberstack API as documented publicly: 22 operations. Contract generated from the documentation by API Evangelist (2026-10-28); not the provider's own document.

Pricing Plans 1

Published pricing tiers and plan structures.

Memberstack Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Memberstack Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

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

Memberstack Context

26 classes · 44 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Memberstack API Rules

12 rules · 9 errors 2 warnings 1 info

SPECTRAL

7 properties

JSON SCHEMA

Scroll for all 10

Security Posture 2

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

Memberstack Authentication

2 schemes

SECURITY

Memberstack Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Memberstack Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Webhooks

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

Operate 4

Status, limits, changes, and where to get help

RateLimits

ChangeLog

Support

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: memberstack
name: Memberstack
description: Memberstack provides a membership and authentication platform for Webflow, WordPress, and custom sites, enabling
  user sign‑ups, social logins, gated content, and Stripe payment integration, with no hidden fees and scalable pricing as
  businesses grow.
url: https://artifacts.apis.io/memberstack/apis.yml
image: https://www.memberstack.com/brand/memberstack-logo-full-light.png
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- Membership
- Webflow
- SaaS
- Authentication
- Payments
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/memberstack-rate-limits.yml
- type: Plans
  url: plans/memberstack-plans-pricing.yml
- type: Spectral
  url: rules/memberstack-rules.yml
- type: JSONLD
  url: json-ld/memberstack-context.jsonld
- type: Vocabulary
  url: vocabulary/memberstack-vocabulary.yml
- type: DataModel
  url: data-model/memberstack-data-model.yml
- type: ChangeLog
  url: changelog/memberstack-changelog.yml
- type: Authentication
  url: authentication/memberstack-authentication.yml
- type: Conformance
  url: conformance/memberstack-conformance.yml
- type: LLMsTxt
  url: llms/memberstack-llms.txt
- type: Hosts
  url: hosts/memberstack-hosts.yml
- type: Vendors
  url: vendors/memberstack-vendors.yml
- type: SDKs
  url: packages/memberstack-packages.yml
- type: Packages
  url: packages/memberstack-packages.yml
- type: Webhooks
  url: https://www.memberstack.com/features/webhooks
- type: Support
  url: https://www.memberstack.com/features/help-center
- type: ChangeLog
  url: https://www.memberstack.com/changelog
- type: GettingStarted
  url: https://developers.memberstack.com/dom-package/quick-start
- type: DomainSecurity
  url: security/memberstack-domain-security.yml
- type: Website
  url: https://memberstack.com/
- type: Blog
  url: https://www.memberstack.com/blog
- type: Pricing
  url: https://www.memberstack.com/pricing
- type: SignUp
  url: https://www.memberstack.com/signup
- type: DeveloperPortal
  url: https://developers.memberstack.com/
- type: Documentation
  url: https://developers.memberstack.com/
- type: GitHubOrganization
  url: https://github.com/Memberstack
apis:
- aid: memberstack:admin-rest-api
  name: Admin REST API
  description: Server-side Memberstack Admin REST API for managing members, verifying tokens, and other administrative tasks.
  humanURL: https://developers.memberstack.com/admin-rest-api/quick-start
  baseURL: https://admin.memberstack.com
  tags:
  - Admin
  - REST
  tags_raw:
  - Admin REST API
  properties:
  - type: Documentation
    url: https://developers.memberstack.com/admin-rest-api/quick-start.md
- aid: memberstack:memberstack-api
  name: Memberstack API
  description: 'Memberstack API as documented publicly: 22 operations. Contract generated from the documentation by API Evangelist
    (2026-10-28);

    not the provider''s own document.'
  humanURL: https://developers.memberstack.com/admin-rest-api
  baseURL: https://admin.memberstack.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/memberstack-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/memberstack-post-members-response-schema.json
  - type: JSONSchema
    url: json-schema/memberstack-get-v2-data-tables-response-schema.json
  - type: JSONSchema
    url: json-schema/memberstack-post-members-request-schema.json
  - type: JSONSchema
    url: json-schema/memberstack-get-v1-data-tables-tablekey-response-schema.json
  - type: JSONSchema
    url: json-schema/memberstack-patch-members-id-request-schema.json
  - type: JSONSchema
    url: json-schema/memberstack-post-v1-data-records-query-request-schema.json
x-submission-probe: 301 https://www.memberstack.com/, 2026-10-26
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI, AsyncAPI, GraphQL, or other machine‑readable contract was found; attempts to fetch common spec URLs
    returned HTML pages.
  evidence:
  - url: https://app.memberstack.com/openapi.json
    status: 200
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 33
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Memberstack API — frequently asked questions

Does Memberstack have an API?

Yes. APIs.io lists 2 APIs from Memberstack, including Admin REST API and Memberstack API.

Is there an OpenAPI specification for the Memberstack API?

Yes. APIs.io indexes 1 OpenAPI specification for Memberstack, each linked for download from this page.

How do I authenticate with the Memberstack API?

Memberstack uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Memberstack Authentication.

How much does the Memberstack API cost?

APIs.io lists 2 pricing plans for Memberstack, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Memberstack API ready for AI agents?

Memberstack has a Kin Score of 43.3 out of 100 (developing) and an Agent Readiness score of 26.8 (agent-aware), scored by API Evangelist on 2026-10-31.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/memberstack"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/memberstack/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/memberstack/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.