Zulily

Zulily is an online retailer of daily deals on apparel, home, toys, and lifestyle goods. After its 2023 shutdown the brand was acquired and relaunched as a Shopify-hosted store. The relaunched storefront is agent-native: it implements the Universal Commerce Protocol (UCP) with a JSON-RPC MCP shopping endpoint, exposes OpenID Connect / OAuth 2.0 authentication via the Shopify Customer Account API (including a customer-account-mcp-api scope), and publishes an llms.txt / agents.md describing how AI shopping agents can discover products and run buyer-approved checkouts. This profile was surfaced as an a16z / Trinity Ventures portfolio company and enriched from Zulily's real public agent-commerce surface.

Zulily publishes 2 APIs on the APIs.io network. Tagged areas include Company, E-Commerce, Retail, Shopping, and Commerce.

Zulily’s developer surface includes authentication and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

17.8/100 emerging ▬ flat Agent 24/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessSelf serve

2 APIs 1 MCP Servers

Company E-Commerce Retail Shopping Commerce Agent Commerce Universal Commerce Protocol MCP Shopify

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 17.8/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.8 / 20

Access Clarity 4.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.2 / 12

Discoverability 7.6 / 10

Agent readiness — 24/100 · 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

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.

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/zulily: 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.

Zulily UCP Shopping (MCP)

Zulily's agent-facing commerce API implementing the Universal Commerce Protocol (UCP) over a JSON-RPC MCP endpoint — search the catalog, build a cart, and run a buyer-approved c...

Zulily Customer Account API (Shopify)

OpenID Connect / OAuth 2.0 authentication and customer-account access for Zulily shoppers, provided by the Shopify Customer Account API, including an MCP-scoped agent surface.

MCP Servers 1

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

Zulily MCP Server

MCP SERVER

Security Posture 1

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

Zulily Authentication

oauth2/openIdConnect · 1 scheme

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Zulily Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Resources

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

WellKnown

MCPServer

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Conventions

Conventions

Access & Security 3

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

Authentication

Authentication

OAuthScopes

OAuthScopes

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: zulily
name: Zulily
description: 'Zulily is an online retailer of daily deals on apparel, home, toys, and lifestyle goods. After its 2023 shutdown
  the brand was acquired and relaunched as a Shopify-hosted store. The relaunched storefront is agent-native: it implements
  the Universal Commerce Protocol (UCP) with a JSON-RPC MCP shopping endpoint, exposes OpenID Connect / OAuth 2.0 authentication
  via the Shopify Customer Account API (including a customer-account-mcp-api scope), and publishes an llms.txt / agents.md
  describing how AI shopping agents can discover products and run buyer-approved checkouts. This profile was surfaced as an
  a16z / Trinity Ventures portfolio company and enriched from Zulily''s real public agent-commerce surface.'
url: https://raw.githubusercontent.com/api-evangelist/zulily/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- trinity-ventures
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: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://www.zulily.com/favicon.ico
tags:
- Company
- E-Commerce
- Retail
- Shopping
- Commerce
- Agent Commerce
- Universal Commerce Protocol
- MCP
- Shopify
tags_raw:
- Company
- Ecommerce
- Retail
- Shopping
- Commerce
- Agent Commerce
- Universal Commerce Protocol
- MCP
- Shopify
apis:
- name: Zulily UCP Shopping (MCP)
  description: Zulily's agent-facing commerce API implementing the Universal Commerce Protocol (UCP) over a JSON-RPC MCP endpoint
    — search the catalog, build a cart, and run a buyer-approved checkout.
  humanURL: https://www.zulily.com/llms.txt
  baseURL: https://www.zulily.com/api/ucp/mcp
  tags:
  - Commerce
  - MCP
  - UCP
  - Agent Commerce
  properties:
  - type: MCPServer
    url: mcp/zulily-mcp.yml
  - type: WellKnown
    url: well-known/zulily-well-known.yml
  - type: AgentSkill
    url: skills/_index.yml
- name: Zulily Customer Account API (Shopify)
  description: OpenID Connect / OAuth 2.0 authentication and customer-account access for Zulily shoppers, provided by the
    Shopify Customer Account API, including an MCP-scoped agent surface.
  humanURL: https://shopify.dev/docs/api/customer
  baseURL: https://account.zulily.com/authentication
  tags:
  - Authentication
  - OpenID Connect
  tags_raw:
  - Authentication
  - OAuth
  - OpenID Connect
  properties:
  - type: Authentication
    url: authentication/zulily-authentication.yml
  - type: OAuthScopes
    url: scopes/zulily-scopes.yml
common:
- type: Website
  url: https://www.zulily.com
- type: LLMsTxt
  url: llms/zulily-llms.txt
- type: WellKnown
  url: well-known/zulily-well-known.yml
- type: SecurityTxt
  url: llms/zulily-agents.md
- type: MCPServer
  url: mcp/zulily-mcp.yml
- type: Authentication
  url: authentication/zulily-authentication.yml
- type: OAuthScopes
  url: scopes/zulily-scopes.yml
- type: Conformance
  url: conformance/zulily-conformance.yml
- type: Conventions
  url: conventions/zulily-conventions.yml
- type: AgentSkill
  url: skills/_index.yml
- type: PrivacyPolicy
  url: https://www.zulily.com/policies/privacy-policy
- type: TermsOfService
  url: https://www.zulily.com/policies/terms-of-service
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io

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