UNTUCKit

UNTUCKit is a US apparel brand and omnichannel retailer best known for shirts designed to be worn untucked, selling menswear and womenswear through untuckit.com and its retail stores. Its Shopify-powered storefront is notably agent-ready: the store publishes agents.md and llms.txt operating instructions, a Universal Commerce Protocol (UCP) merchant profile at /.well-known/ucp, a live MCP endpoint at /api/ucp/mcp for catalog search, cart, and buyer-approved checkout, OIDC/OAuth discovery for the Shopify Customer Account API, and unauthenticated product and collection JSON.

UNTUCKit publishes 2 APIs on the APIs.io network. Tagged areas include Company, Apparel, Retail, E-Commerce, and Shopify.

UNTUCKit’s developer surface includes authentication, support, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.3/100 emerging ▬ flat Agent 17/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessSelf serve

2 APIs 1 MCP Servers

Company Apparel Retail E-Commerce Shopify Agentic Commerce MCP Universal Commerce Protocol

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 24.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 6.1 / 17

Access Clarity 4.7 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 5.7 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 17/100 · 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 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 0 / 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/untuckit: 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.

UNTUCKit Storefront Agent Commerce (UCP/MCP) API

Live MCP endpoint implementing the Universal Commerce Protocol shopping service for the UNTUCKit store: catalog search, cart, checkout, fulfillment, discounts, and orders, with ...

UNTUCKit Storefront Catalog JSON API

Unauthenticated read-only Shopify storefront JSON documented in the store's agents.md: product JSON at /products/{handle}.json, collection product listings at /collections/{hand...

MCP Servers 1

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

UNTUCKit MCP Server

UNTUCKit's Shopify storefront operates a live, first-party-hosted MCP endpoint as the transport for the Universal Commerce Protocol (UCP) shopping service. The endpoint, its Ope...

MCP SERVER

Security Posture 2

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

Untuckit Authentication

3 schemes

SECURITY

Untuckit Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Untuckit Scopes

4 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Conventions

Conventions

Lifecycle

Lifecycle

Access & Security 3

Authentication, authorization, and security posture

OAuthScopes

OAuthScopes

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: untuckit
name: UNTUCKit
description: 'UNTUCKit is a US apparel brand and omnichannel retailer best known for shirts designed to be worn untucked,
  selling menswear and womenswear through untuckit.com and its retail stores. Its Shopify-powered storefront is notably agent-ready:
  the store publishes agents.md and llms.txt operating instructions, a Universal Commerce Protocol (UCP) merchant profile
  at /.well-known/ucp, a live MCP endpoint at /api/ucp/mcp for catalog search, cart, and buyer-approved checkout, OIDC/OAuth
  discovery for the Shopify Customer Account API, and unauthenticated product and collection JSON.'
url: https://raw.githubusercontent.com/api-evangelist/untuckit/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
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/48734252?v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- bond-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Apparel
- Retail
- E-Commerce
- Shopify
- Agentic Commerce
- MCP
- Universal Commerce Protocol
tags_raw:
- Company
- Apparel
- Retail
- eCommerce
- Shopify
- Agentic Commerce
- MCP
- UCP
apis:
- name: UNTUCKit Storefront Agent Commerce (UCP/MCP) API
  description: 'Live MCP endpoint implementing the Universal Commerce Protocol shopping service for the UNTUCKit store: catalog
    search, cart, checkout, fulfillment, discounts, and orders, with Shop Pay / Google Pay / card payment handlers and a hard
    buyer-approval rule on payment. Discovered via /.well-known/ucp; schema published as OpenRPC at ucp.dev.'
  humanURL: https://www.untuckit.com/agents.md
  baseURL: https://www.untuckit.com/api/ucp/mcp
  tags:
  - Agentic Commerce
  - MCP
  - Universal Commerce Protocol
  - Checkout
  tags_raw:
  - Agentic Commerce
  - MCP
  - UCP
  - Checkout
  properties:
  - type: Documentation
    url: https://www.untuckit.com/agents.md
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: ucp
- name: UNTUCKit Storefront Catalog JSON API
  description: 'Unauthenticated read-only Shopify storefront JSON documented in the store''s agents.md: product JSON at /products/{handle}.json,
    collection product listings at /collections/{handle}/products.json, product search at /search?q={query}&type=product,
    and sitemap.xml for store metadata.'
  humanURL: https://www.untuckit.com/agents.md
  tags:
  - Product
  - Catalog
  - E-Commerce
  tags_raw:
  - Products
  - Catalog
  - eCommerce
  properties:
  - type: Documentation
    url: https://www.untuckit.com/agents.md
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: storefront-json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://untuckit.com
- type: MCPServer
  url: mcp/untuckit-mcp.yml
- type: LLMsTxt
  url: llms/untuckit-llms.txt
- type: WellKnown
  url: well-known/untuckit-well-known.yml
- type: AgentSkill
  url: skills/_index.yml
- type: OAuthScopes
  url: scopes/untuckit-scopes.yml
- type: Authentication
  url: authentication/untuckit-authentication.yml
- type: Conformance
  url: conformance/untuckit-conformance.yml
- type: Conventions
  url: conventions/untuckit-conventions.yml
- type: Lifecycle
  url: lifecycle/untuckit-lifecycle.yml
- type: DomainSecurity
  url: security/untuckit-domain-security.yml
- type: PrivacyPolicy
  url: https://www.untuckit.com/policies/privacy-policy
- type: TermsOfService
  url: https://www.untuckit.com/policies/terms-of-service
- type: Support
  url: https://www.untuckit.com/pages/contact-us
- type: Blog
  url: https://www.untuckit.com/blogs/news
- type: Login
  url: https://www.untuckit.com/account/login
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 14
  pass: local-v1

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