Lemon Perfect

Lemon Perfect is an Atlanta-based beverage company founded in 2017 by Yanni Hufnagel, making organic, zero-sugar flavored lemon water powered by half a squeezed organic lemon per bottle and 100% daily value vitamin C. It sells direct-to-consumer at lemonperfect.com alongside national retail distribution. It is not a software vendor and publishes no developer program, yet its storefront exposes a substantial machine-readable surface on its own apex domain: a Storefront GraphQL API with open introspection, a hosted Model Context Protocol endpoint implementing the Universal Commerce Protocol for agent-driven search, cart and checkout, OpenID Connect and RFC 8414 discovery for customer accounts, and first-party agent instructions at /agents.md and /llms.txt that set an explicit human-approval-before-payment policy.

Lemon Perfect is listed with 2 APIs on the APIs.io network. Tagged areas include Company, Beverages, Consumer Packaged Goods, E-Commerce, and Retail.

Lemon Perfect’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, authentication, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.0/100 thin ▬ flat Agent 34/100 agent ready Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

AccessSelf serve

2 APIs 1 MCP Servers

Company Beverages Consumer Packaged Goods E-Commerce Retail Direct to Consumer Agentic Commerce MCP GraphQL Universal Commerce Protocol Shopify

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 36.0/100 · thin

Contract Quality 2.2 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 5.8 / 17

Operational Transparency 3.5 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 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 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/lemon-perfect: 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 →

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
Consumer Goods (product data and retail supply chain)	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 1

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.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 2

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

Lemon Perfect Storefront GraphQL API

The Shopify Storefront GraphQL API served on lemonperfect.com. Introspection is open anonymously: 428 types, 35 query fields and 41 mutations covering products, collections, sea...

Lemon Perfect UCP Agentic Commerce (MCP)

A hosted Model Context Protocol endpoint implementing the Universal Commerce Protocol dev.ucp.shopping service (version 2026-04-08) for agent-driven catalog search, cart, checko...

MCP Servers 1

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

Lemon Perfect MCP Server

Lemon Perfect publishes a live, hosted MCP endpoint on its own apex domain as the transport for the Universal Commerce Protocol (UCP) shopping service. The endpoint is advertise...

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Lemon Perfect Rate Limits

3 limits

RATE LIMITS

Security Posture 2

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

Lemon Perfect Authentication

oauth2/openIdConnect/apiKey/agentIdentity · 4 schemes

SECURITY

Lemon Perfect Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Lemon Perfect Scopes

4 scopes · authorizationCode/refreshToken/jwtBearer

4 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

AgentSkill

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Conformance

Lifecycle

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 4

Properties that don't map to a standard resource type

RefundPolicy

ShippingPolicy

AgentsMd

OpenIDConnect

Source (apis.yml)

aid: lemon-perfect
name: Lemon Perfect
description: 'Lemon Perfect is an Atlanta-based beverage company founded in 2017 by Yanni Hufnagel, making organic, zero-sugar
  flavored lemon water powered by half a squeezed organic lemon per bottle and 100% daily value vitamin C. It sells direct-to-consumer
  at lemonperfect.com alongside national retail distribution. It is not a software vendor and publishes no developer program,
  yet its storefront exposes a substantial machine-readable surface on its own apex domain: a Storefront GraphQL API with
  open introspection, a hosted Model Context Protocol endpoint implementing the Universal Commerce Protocol for agent-driven
  search, cart and checkout, OpenID Connect and RFC 8414 discovery for customer accounts, and first-party agent instructions
  at /agents.md and /llms.txt that set an explicit human-approval-before-payment policy.'
url: https://raw.githubusercontent.com/api-evangelist/lemon-perfect/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://cdn.shopify.com/s/files/1/0032/0520/2020/files/Product_Lineup_52.jpg
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.23'
created: '2026-08-04'
modified: '2026-08-04'
tags:
- Company
- Beverages
- Consumer Packaged Goods
- E-Commerce
- Retail
- Direct to Consumer
- Agentic Commerce
- MCP
- GraphQL
- Universal Commerce Protocol
- Shopify
tags_raw:
- Company
- Beverages
- Consumer Packaged Goods
- Ecommerce
- Retail
- Direct to Consumer
- Agentic Commerce
- Model Context Protocol
- GraphQL
- Universal Commerce Protocol
- Shopify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Lemon Perfect Storefront GraphQL API
  description: 'The Shopify Storefront GraphQL API served on lemonperfect.com. Introspection is open anonymously: 428 types,
    35 query fields and 41 mutations covering products, collections, search, carts, customer accounts and Shop Pay payment-request
    sessions. Calendar-versioned in the path; 2026-07 current.'
  humanURL: https://lemonperfect.com/agents.md
  baseURL: https://lemonperfect.com/api/2026-07/graphql.json
  tags:
  - GraphQL
  - E-Commerce
  - Product
  - Cart
  tags_raw:
  - GraphQL
  - Ecommerce
  - Products
  - Cart
  properties:
  - type: GraphQL
    url: graphql/lemon-perfect-storefront-2026-07.graphql
  - type: DataModel
    url: data-model/lemon-perfect-data-model.yml
  - type: ErrorCatalog
    url: errors/lemon-perfect-error-codes.yml
  - type: DeclineCodes
    url: errors/lemon-perfect-decline-codes.yml
  - type: AgentSkill
    url: skills/lemon-perfect-browse-catalog.md
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: storefront-graphql
- name: Lemon Perfect UCP Agentic Commerce (MCP)
  description: A hosted Model Context Protocol endpoint implementing the Universal Commerce Protocol dev.ucp.shopping service
    (version 2026-04-08) for agent-driven catalog search, cart, checkout, fulfillment and order lookup. Advertised in robots.txt,
    /agents.md, /llms.txt and /.well-known/ucp. tools/list is gated on a resolvable UCP-Agent profile; payment requires explicit
    human approval.
  humanURL: https://lemonperfect.com/agents.md
  baseURL: https://lemonperfect.com/api/ucp/mcp
  tags:
  - MCP
  - Agentic Commerce
  - Checkout
  properties:
  - type: MCPServer
    url: mcp/lemon-perfect-mcp.yml
  - type: ToolCrosswalk
    url: mcp/lemon-perfect-tool-crosswalk.yml
  - type: AgentSkill
    url: skills/lemon-perfect-agentic-purchase.md
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: ucp
common:
- type: Website
  url: https://lemonperfect.com/
- type: Documentation
  url: https://lemonperfect.com/agents.md
- type: APIReference
  url: https://lemonperfect.com/.well-known/ucp
- type: GettingStarted
  url: https://lemonperfect.com/llms.txt
- type: Blog
  url: https://lemonperfect.com/blogs/news
- type: BlogRSS
  url: https://lemonperfect.com/blogs/news.atom
- type: Support
  url: https://lemonperfect.com/pages/contact-us
- type: SignUp
  url: https://lemonperfect.com/account/login
- type: TermsOfService
  url: https://lemonperfect.com/policies/terms-of-service
- type: PrivacyPolicy
  url: https://lemonperfect.com/policies/privacy-policy
- type: RefundPolicy
  url: https://lemonperfect.com/policies/refund-policy
- type: ShippingPolicy
  url: https://lemonperfect.com/policies/shipping-policy
- type: LLMsTxt
  url: llms/lemon-perfect-llms.txt
- type: AgentsMd
  url: llms/lemon-perfect-agents.md
- type: WellKnown
  url: well-known/lemon-perfect-well-known.yml
- type: Authentication
  url: authentication/lemon-perfect-authentication.yml
- type: OAuthScopes
  url: scopes/lemon-perfect-scopes.yml
- type: OpenIDConnect
  url: well-known/lemon-perfect-openid-configuration.json
- type: Conventions
  url: conventions/lemon-perfect-conventions.yml
- type: Idempotency
  url: conventions/lemon-perfect-conventions.yml
- type: RateLimits
  url: rate-limits/lemon-perfect-rate-limits.yml
- type: Conformance
  url: conformance/lemon-perfect-conformance.yml
- type: Lifecycle
  url: lifecycle/lemon-perfect-lifecycle.yml
- type: DomainSecurity
  url: security/lemon-perfect-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment-notes:
  no_status_page: Lemon Perfect operates no status page for its API surface (status.lemonperfect.com does not resolve; /status
    is 404). No StatusPage pointer is emitted.
  no_deprecation_policy: Deprecation is signalled inside the GraphQL schema via @deprecated (54 fields) but no deprecation
    policy document is published. No Deprecation pointer.
  no_security_disclosure: /.well-known/security.txt returns 404 and no responsible-disclosure or bug bounty page was found.
    No Security/VulnerabilityDisclosure pointer.
  no_compliance_program: No trust center and no named certifications published. No Compliance or TrustCenter pointer.
  no_openapi: No OpenAPI/Swagger document exists on lemonperfect.com or the canonical the-lemon-perfect-company.myshopify.com
    host. The machine-readable contracts are GraphQL (introspected verbatim) and the UCP/MCP OpenRPC schema.
  no_sdks: No first-party Lemon Perfect client library exists in any public registry. No Packages/SDKs pointer.
  no_a2a: Both /.well-known/agent-card.json and /.well-known/agent.json returned 404. Nothing was written to a2a/ — agent
    cards are never authored on a provider's behalf.
  platform_note: The API surface is Shopify-provided but served from, and configured for, the company's own apex domain. Platform-level
    facts are attributed as such inside each artifact rather than claimed as first-party commitments.
x-enrichment:
  date: '2026-08-04'
  status: enriched
  artifacts_added: 24
  pass: local-v1

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