JOLYN

JOLYN is an athletic swimwear and apparel brand for competitive and team swimming, water polo, and aquatics, known for durable, functional practice and racing suits, team uniforms, and active lifestyle apparel. Surfaced as a portfolio company of Norwest Venture Partners and added to the API Evangelist network, JOLYN publishes no first-party developer API — its direct-to-consumer storefront at jolyn.com (jolynclothing.com redirects here) is Shopify-hosted. That platform exposes a genuine agent-native commerce surface: a published /llms.txt with agent instructions, OpenID Connect discovery for the Shopify Customer Account API, and a live Universal Commerce Protocol (UCP) MCP endpoint for buyer-approved, agent-driven shopping and checkout.

JOLYN is listed with 1 API on the APIs.io network. Tagged areas include Company, Retail, E-Commerce, Apparel, and Swimwear.

JOLYN’s developer surface includes engineering blog, authentication, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

16.7/100 emerging ▬ flat Agent 14/100 agent aware Front door AI 1/6 silent Heartbeat 20/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers

Company Retail E-Commerce Apparel Swimwear Direct to Consumer Shopify Agentic Commerce

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 16.7/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 6.4 / 9

Regulatory Posture 4.4 / 15

Agent readiness — 14/100 · 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 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 5 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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)

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Access Clarity scores 21.1 — up to +15.8 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/jolynclothing/apis.yml: open an issue on github.com/api-evangelist/jolynclothing 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Fashion & Apparel (apparel, footwear, textiles)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (platform)

Universal Commerce Protocol (UCP)

measured — observed by APIs.io (shopify)

APIs 1

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

JOLYN UCP Agent Commerce (Shopify)

Shopify-served Universal Commerce Protocol MCP endpoint for the JOLYN store, enabling buyer-approved agent-driven catalog search, cart, and checkout. Advertised in /.well-known/...

MCP Servers 1

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

JOLYN MCP Server

Remote MCP server at jolyn.com over HTTP; 5 tools listed.

MCP SERVER

Security Posture 2

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

Jolynclothing Authentication

openIdConnect/oauth2 · 1 scheme

SECURITY

Jolynclothing Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Jolynclothing Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

MCPServer

MCPServer

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: jolynclothing
name: JOLYN
description: 'JOLYN is an athletic swimwear and apparel brand for competitive and team swimming, water polo, and aquatics,
  known for durable, functional practice and racing suits, team uniforms, and active lifestyle apparel. Surfaced as a portfolio
  company of Norwest Venture Partners and added to the API Evangelist network, JOLYN publishes no first-party developer API
  — its direct-to-consumer storefront at jolyn.com (jolynclothing.com redirects here) is Shopify-hosted. That platform exposes
  a genuine agent-native commerce surface: a published /llms.txt with agent instructions, OpenID Connect discovery for the
  Shopify Customer Account API, and a live Universal Commerce Protocol (UCP) MCP endpoint for buyer-approved, agent-driven
  shopping and checkout.'
url: https://raw.githubusercontent.com/api-evangelist/jolynclothing/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- norwest-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
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: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Retail
- E-Commerce
- Apparel
- Swimwear
- Direct to Consumer
- Shopify
- Agentic Commerce
tags_raw:
- Company
- Retail
- E-Commerce
- Apparel
- Swimwear
- Direct-to-Consumer
- Shopify
- Agentic Commerce
image: https://cdn.shopify.com/s/files/1/0703/0099/files/JOLYN-LOGO-Black.png?height=628&pad_color=ffffff&v=1708450946&width=1200
apis:
- name: JOLYN UCP Agent Commerce (Shopify)
  description: Shopify-served Universal Commerce Protocol MCP endpoint for the JOLYN store, enabling buyer-approved agent-driven
    catalog search, cart, and checkout. Advertised in /.well-known/ucp and documented in /llms.txt.
  humanURL: https://jolyn.com/llms.txt
  baseURL: https://jolyn.com/api/ucp/mcp
  properties:
  - type: MCPServer
    url: mcp/jolynclothing-mcp.yml
  - type: LLMsTxt
    url: llms/jolynclothing-llms.txt
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: ucp
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://jolyn.com/blogs/jolyn-clothing
  type: Blog
- url: https://jolyn.com/blogs/jolyn-clothing.atom
  type: BlogRSS
- type: DomainSecurity
  url: security/jolynclothing-domain-security.yml
- type: Website
  url: https://jolyn.com
- type: LLMsTxt
  url: llms/jolynclothing-llms.txt
- type: WellKnown
  url: well-known/jolynclothing-well-known.yml
- type: MCPServer
  url: mcp/jolynclothing-mcp.yml
- type: Authentication
  url: authentication/jolynclothing-authentication.yml
- type: OAuthScopes
  url: scopes/jolynclothing-scopes.yml
- type: Conventions
  url: conventions/jolynclothing-conventions.yml
- type: TermsOfService
  url: https://jolyn.com/policies/terms-of-service
- type: PrivacyPolicy
  url: https://jolyn.com/policies/privacy-policy
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

JOLYN API — frequently asked questions

Does JOLYN have an API?

Yes. APIs.io lists 1 API from JOLYN, including JOLYN UCP Agent Commerce (Shopify).

How do I authenticate with the JOLYN API?

JOLYN documents its authentication (openIdConnect/oauth2 · 1 scheme). The details are profiled on APIs.io as Jolynclothing Authentication.

Does JOLYN have an MCP server?

Yes. APIs.io lists 1 MCP server for JOLYN: Remote MCP server at jolyn.com over HTTP; 5 tools listed.

Is the JOLYN API ready for AI agents?

JOLYN has a Kin Score of 16.7 out of 100 (emerging) and an Agent Readiness score of 13.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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