Willow

Willow Innovations, Inc. is a Mountain View, California consumer health-technology company founded in 2014 that makes wearable, in-bra breast pumps — the Willow 360, Willow Go and the Wave manual pump — sold direct to consumers at onewillow.com and paired with a mobile app that tracks output and controls suction. Willow publishes no developer programme, API keys or OpenAPI, but its storefront is an agent-callable surface: it serves a Universal Commerce Protocol merchant profile at /.well-known/ucp.json and a live, anonymous MCP endpoint at /api/ucp/mcp exposing 13 tools for catalog search, cart, checkout and order retrieval, alongside published agent instructions (agents.md, llms.txt) and OAuth 2.0/OIDC customer-account discovery documents.

Willow publishes 1 API on the APIs.io network. Tagged areas include Company, Consumer Health, Breast Pumps, Maternal Health, and Medical Devices.

Willow’s developer surface includes documentation, authentication, support, engineering blog, signup flow, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
27.0/100 thin Agent 28/100 agent aware Full breakdown ↓
scored 2026-09-04 · rubric v0.18.3
1 APIs 1 MCP Servers
CompanyConsumer HealthBreast PumpsMaternal HealthMedical DevicesEcommerceAgentic CommerceMCPUCPagent-nativeShopify

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-04 · rubric v0.18.3
Composite quality — 27.0/100 · thin
Contract Quality 0.0 / 21
Developer Ergonomics 5.2 / 17
Access Clarity 5.8 / 17
Operational Transparency 0.0 / 11
Contract Governance 1.9 / 10
Discoverability 5.8 / 9
Regulatory Posture 7.9 / 15
Agent readiness — 28/100 · 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 Health 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.
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/willow: 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 1

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

Willow Pump UCP Commerce MCP

Willow's storefront agent surface — a JSON-RPC 2.0 Model Context Protocol endpoint implementing the Universal Commerce Protocol 2026-08-25 shopping service. tools/list answers u...

MCP Servers 1

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

Willow Pump UCP Commerce MCP Server

Willow's online store at onewillow.com exposes a live, anonymous Model Context Protocol endpoint implementing the Universal Commerce Protocol (UCP) shopping service. An MCP clie...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Willow Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Willow Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Willow Authentication

4 schemes

SECURITY

Willow Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Willow Scopes

OAuth 2.0 · no documented scopes

0 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
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Lifecycle
Lifecycle
 DataModel
DataModel

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication
 OAuthScopes
OAuthScopes

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 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: willow
name: Willow
description: 'Willow Innovations, Inc. is a Mountain View, California consumer health-technology company founded in 2014 that
  makes wearable, in-bra breast pumps — the Willow 360, Willow Go and the Wave manual pump — sold direct to consumers at onewillow.com
  and paired with a mobile app that tracks output and controls suction. Willow publishes no developer programme, API keys
  or OpenAPI, but its storefront is an agent-callable surface: it serves a Universal Commerce Protocol merchant profile at
  /.well-known/ucp.json and a live, anonymous MCP endpoint at /api/ucp/mcp exposing 13 tools for catalog search, cart, checkout
  and order retrieval, alongside published agent instructions (agents.md, llms.txt) and OAuth 2.0/OIDC customer-account discovery
  documents.'
image: https://onewillow.com/cdn/shop/files/OG-Image_db607121-7a26-49c9-b231-3a1e572a0fca_1200x630.jpg?v=1716782735
url: https://raw.githubusercontent.com/api-evangelist/willow/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-04'
modified: '2026-09-04'
tags:
- Company
- Consumer Health
- Breast Pumps
- Maternal Health
- Medical Devices
- Ecommerce
- Agentic Commerce
- MCP
- UCP
- agent-native
- Shopify
tags_raw:
- company
- consumer-health
- breast-pumps
- maternal-health
- medical-devices
- ecommerce
- agentic-commerce
- mcp
- ucp
- agent-native
- shopify
apis:
- name: Willow Pump UCP Commerce MCP
  description: 'Willow''s storefront agent surface — a JSON-RPC 2.0 Model Context Protocol endpoint implementing the Universal
    Commerce Protocol 2026-08-25 shopping service. tools/list answers unauthenticated and returns 13 tools with full JSON
    Schema 2020-12 input schemas: search_catalog, lookup_catalog and get_product for the catalog; create/get/update/cancel_cart
    and create/get/update/complete/ cancel_checkout for the purchase flow; and get_order behind a signed agent JWT. Every
    tools/call requires a resolvable UCP agent profile URI, complete_checkout requires an idempotency key, and payment requires
    explicit buyer approval. The runtime is Shopify''s universal-commerce server running under Willow''s own domain and transacting
    Willow''s own catalog.'
  humanURL: https://onewillow.com/agents.md
  baseURL: https://onewillow.com/api/ucp/mcp
  image: https://onewillow.com/cdn/shop/files/OG-Image_db607121-7a26-49c9-b231-3a1e572a0fca_1200x630.jpg?v=1716782735
  tags:
  - Agentic Commerce
  - MCP
  - UCP
  - Ecommerce
  - Consumer Health
  - agent-native
  tags_raw:
  - agentic-commerce
  - mcp
  - ucp
  - ecommerce
  - consumer-health
  - agent-native
  properties:
  - type: Documentation
    url: https://onewillow.com/agents.md
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/willow-domain-security.yml
- type: Website
  url: https://onewillow.com/
- type: Documentation
  url: https://onewillow.com/agents.md
- type: LLMsTxt
  url: llms/willow-llms.txt
- type: MCPServer
  url: mcp/willow-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: WellKnown
  url: well-known/willow-well-known.yml
- type: Authentication
  url: authentication/willow-authentication.yml
- type: OAuthScopes
  url: scopes/willow-scopes.yml
- type: Conventions
  url: conventions/willow-conventions.yml
- type: Idempotency
  url: conventions/willow-conventions.yml
- type: ErrorCatalog
  url: errors/willow-problem-types.yml
- type: Conformance
  url: conformance/willow-conformance.yml
- type: Lifecycle
  url: lifecycle/willow-lifecycle.yml
- type: DataModel
  url: data-model/willow-data-model.yml
- type: RateLimits
  url: rate-limits/willow-rate-limits.yml
- type: Plans
  url: plans/willow-plans-pricing.yml
- type: Support
  url: https://help.onewillow.com/s
- type: HelpCenter
  url: https://onewillow.com/pages/willow-support
- type: Blog
  url: https://onewillow.com/blogs/all
- type: SignUp
  url: https://onewillow.com/account
- type: TermsOfService
  url: https://onewillow.com/policies/terms-of-service
- type: PrivacyPolicy
  url: https://onewillow.com/policies/privacy-policy
x-enrichment:
  date: '2026-09-04'
  status: enriched
  artifacts_added: 23
  pass: local-v3

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