Maisonette

Maisonette is a New York-based online marketplace for babies and children, founded in 2017 by Sylvana Ward Durrett and Luisana Mendoza de Roccia, selling clothing, toys, furniture and decor for ages 0-12 from a curated network of independent boutiques and 800+ brands. It is a marketplace rather than a single seller: each item ships directly from its brand and is returned separately. Maisonette publishes no OpenAPI and runs no developer program, but its Shopify-hosted storefront exposes a real, live, unauthenticated agent surface — a Universal Commerce Protocol MCP endpoint with thirteen catalog, cart, checkout and order tools, a five-tool storefront MCP endpoint, an llms.txt and agents.md with explicit agent instructions, an agent-discovery sitemap, and OAuth 2.0/OIDC and RFC 9728 discovery documents served from its own host.

Maisonette is listed with 2 APIs on the APIs.io network. Tagged areas include Company, Retail, E-Commerce, Marketplace, and Shopping.

Maisonette’s developer surface includes documentation, authentication, support, signup flow, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.9/100 emerging ▬ flat Agent 27/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

AccessSelf serve

2 APIs 1 MCP Servers

Company Retail E-Commerce Marketplace Shopping Children Baby Apparel Homes Agentic Commerce MCP Universal Commerce Protocol Shopify

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 24.9/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.8 / 17

Access Clarity 5.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 5 / 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 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/.

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/maisonette: 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.

Maisonette UCP Commerce MCP

Maisonette's agent-facing commerce surface: a Universal Commerce Protocol (2026-04-08) MCP server exposing thirteen tools across catalog search and lookup, cart, checkout and or...

Maisonette Storefront MCP

The lighter read-and-cart Shopify Storefront MCP surface on Maisonette's own host — five anonymous tools covering catalog search, product detail, cart read and update, and a gro...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Maisonette MCP Server

Remote MCP server at www.maisonette.com.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Maisonette Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Maisonette Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Maisonette Authentication

5 schemes

SECURITY

Maisonette Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Maisonette Scopes

4 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

WellKnown

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Idempotency

DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

HelpCenter

HelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: maisonette
name: Maisonette
description: 'Maisonette is a New York-based online marketplace for babies and children, founded in 2017 by Sylvana Ward Durrett
  and Luisana Mendoza de Roccia, selling clothing, toys, furniture and decor for ages 0-12 from a curated network of independent
  boutiques and 800+ brands. It is a marketplace rather than a single seller: each item ships directly from its brand and
  is returned separately. Maisonette publishes no OpenAPI and runs no developer program, but its Shopify-hosted storefront
  exposes a real, live, unauthenticated agent surface — a Universal Commerce Protocol MCP endpoint with thirteen catalog,
  cart, checkout and order tools, a five-tool storefront MCP endpoint, an llms.txt and agents.md with explicit agent instructions,
  an agent-discovery sitemap, and OAuth 2.0/OIDC and RFC 9728 discovery documents served from its own host.'
url: https://raw.githubusercontent.com/api-evangelist/maisonette/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
image: https://www.maisonette.com/cdn/shop/files/Favicon_Maisonette_ac4c0de7-1fd8-4114-b034-f15a8d57ac59.png?v=1776358749&width=512
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-25'
modified: '2026-08-25'
tags:
- Company
- Retail
- E-Commerce
- Marketplace
- Shopping
- Children
- Baby
- Apparel
- Homes
- Agentic Commerce
- MCP
- Universal Commerce Protocol
- Shopify
tags_raw:
- Company
- Retail
- E-Commerce
- Marketplace
- Shopping
- Children
- Baby
- Apparel
- Home
- Agentic Commerce
- MCP
- Universal Commerce Protocol
- Shopify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Maisonette UCP Commerce MCP
  description: 'Maisonette''s agent-facing commerce surface: a Universal Commerce Protocol (2026-04-08) MCP server exposing
    thirteen tools across catalog search and lookup, cart, checkout and order. tools/list answers 200 with no credentials;
    tool calls require the caller to supply its own published agent-profile URI, and completing a checkout requires both an
    idempotency key and contemporaneous buyer approval. Announced by the store''s own llms.txt and /.well-known/ucp.'
  humanURL: https://www.maisonette.com/agents.md
  baseURL: https://www.maisonette.com/api/ucp/mcp
  tags:
  - MCP
  - Agentic Commerce
  - Universal Commerce Protocol
  - Checkout
  - Catalog
  properties:
  - type: MCPServer
    url: mcp/maisonette-mcp.yml
  - type: Documentation
    url: https://www.maisonette.com/agents.md
  - type: LLMsTxt
    url: https://www.maisonette.com/llms.txt
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: ucp
- name: Maisonette Storefront MCP
  description: The lighter read-and-cart Shopify Storefront MCP surface on Maisonette's own host — five anonymous tools covering
    catalog search, product detail, cart read and update, and a grounded search over the store's policies and FAQs. Not named
    in llms.txt; discovered by probing the conventional Shopify path.
  humanURL: https://www.maisonette.com/agents.md
  baseURL: https://www.maisonette.com/api/mcp
  tags:
  - MCP
  - Catalog
  - Support
  properties:
  - type: MCPServer
    url: mcp/maisonette-mcp.yml
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: storefront-mcp
common:
- type: Website
  url: https://www.maisonette.com/
- type: Documentation
  url: https://www.maisonette.com/agents.md
- type: LLMsTxt
  url: llms/maisonette-llms.txt
- type: MCPServer
  url: mcp/maisonette-mcp.yml
- type: WellKnown
  url: well-known/maisonette-well-known.yml
- type: Authentication
  url: authentication/maisonette-authentication.yml
- type: OAuthScopes
  url: scopes/maisonette-scopes.yml
- type: Conformance
  url: conformance/maisonette-conformance.yml
- type: ErrorCatalog
  url: errors/maisonette-problem-types.yml
- type: Lifecycle
  url: lifecycle/maisonette-lifecycle.yml
- type: Conventions
  url: conventions/maisonette-conventions.yml
- type: Idempotency
  url: conventions/maisonette-conventions.yml
- type: DataModel
  url: data-model/maisonette-data-model.yml
- type: RateLimits
  url: rate-limits/maisonette-rate-limits.yml
- type: Plans
  url: plans/maisonette-plans-pricing.yml
- type: Packages
  url: packages/maisonette-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/maisonette-domain-security.yml
- type: Support
  url: https://www.maisonette.com/pages/contact
- type: HelpCenter
  url: https://www.maisonette.com/pages/faq
- type: TermsOfService
  url: https://www.maisonette.com/policies/terms-of-service
- type: PrivacyPolicy
  url: https://www.maisonette.com/policies/privacy-policy
- type: SignUp
  url: https://www.maisonette.com/account/register
x-enrichment:
  date: '2026-08-25'
  status: enriched
  artifacts_added: 24
  pass: local-v1

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