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 is listed with 3 APIs on the APIs.io network. Tagged areas include Company, Consumer Health, Breast Pumps, Maternal Health, and Medical Devices.

Willow’s developer surface includes getting-started guide, documentation, authentication, support, engineering blog, signup flow, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.7/100 thin ▬ flat Agent 40/100 agent ready Front door AI 3/6 light Heartbeat 33/100 slowing Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

3 APIs 2 MCP Servers 2 Agent Skills

Company Consumer HealthBreast PumpsMaternal Health Medical Devices E-Commerce Agentic Commerce MCP Universal Commerce Protocol Agent-Native Shopify

Kin Score

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

Composite quality — 33.7/100 · thin

Contract Quality 2.2 / 21

Developer Ergonomics 6.2 / 17

Access Clarity 5.8 / 17

Operational Transparency 3.2 / 11

Contract Governance 1.9 / 10

Discoverability 6.8 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 40/100 · 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 5 / 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 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.

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/willow/"><img src="https://apis.io/badge/willow/card.svg" alt="Willow on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

3 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 10.4 — up to +22.4 composite points
Access Clarity scores 34.2 — up to +13.2 composite points
Developer Ergonomics scores 36.3 — up to +12.7 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/willow/apis.yml: open an issue on github.com/api-evangelist/willow 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
Canada Medical Device Licensing (Health Canada MDALL licence holders, incl. SaMD)	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 3

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)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

APIs 3

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...

Willow Storefront GraphQL

Shopify Storefront GraphQL API served on Willow's own domain at onewillow.com/api/graphql. Anonymous introspection answered on 2026-10-20 (QueryRoot with 34 query fields, 41 mut...

Willow Storefront MCP

Shopify storefront MCP endpoint on Willow's domain at onewillow.com/api/mcp. tools/list answered anonymously on 2026-10-20 with one tool, search_shop_policies_and_faqs, which an...

MCP Servers 2

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

Willow MCP Server

MCP SERVER

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

willow-agentic-checkout

AGENT SKILL

willow-catalog-discovery

AGENT SKILL

Willow API pricing

Rate limits

Agent endpoint 429 back-off: Back off on `429` responses and respect `Retry-After` when provided.

Rate-limit details →

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

1 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

4 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

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

MCPServer

AgentSkill

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Conformance

Lifecycle

DataModel

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 4

Status, limits, changes, and where to get help

Deprecation

RateLimits

Support

HelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

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.'
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
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: '2026-10-20'
tags:
- Company
- Consumer Health
- Breast Pumps
- Maternal Health
- Medical Devices
- E-Commerce
- Agentic Commerce
- MCP
- Universal Commerce Protocol
- Agent-Native
- Shopify
tags_raw:
- company
- consumer-health
- breast-pumps
- maternal-health
- medical-devices
- ecommerce
- agentic-commerce
- mcp
- ucp
- agent-native
- shopify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: GettingStarted
  url: https://shopify.dev/docs/agents/get-started/quickstart
- type: Deprecation
  url: lifecycle/willow-lifecycle.yml
- type: Hosts
  url: hosts/willow-hosts.yml
- type: Vendors
  url: vendors/willow-vendors.yml
- url: https://onewillow.com/blogs/all.atom
  type: BlogRSS
- 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
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
  - Universal Commerce Protocol
  - E-Commerce
  - Consumer Health
  - Agent-Native
  tags_raw:
  - agentic-commerce
  - mcp
  - ucp
  - ecommerce
  - consumer-health
  - agent-native
  properties:
  - type: Documentation
    url: https://onewillow.com/agents.md
  x-surface: platform-generated
  x-platform: shopify
  x-platform-surface: ucp
  aid: willow:willow-pump-ucp-commerce-mcp
- name: Willow Storefront GraphQL
  description: Shopify Storefront GraphQL API served on Willow's own domain at onewillow.com/api/graphql. Anonymous introspection
    answered on 2026-10-20 (QueryRoot with 34 query fields, 41 mutations covering products, collections, cart, customer and
    checkout). The schema is Shopify's platform Storefront API; the catalog and carts it serves are Willow's.
  humanURL: https://onewillow.com/
  baseURL: https://onewillow.com/api/graphql
  tags:
  - GraphQL
  - E-Commerce
  - Shopify
  - Storefront
  properties:
  - type: GraphQL
    url: graphql/willow-storefront.graphql
  x-surface: platform-generated
  x-platform: shopify
  aid: willow:willow-storefront-graphql
  image: https://onewillow.com/cdn/shop/files/OG-Image_db607121-7a26-49c9-b231-3a1e572a0fca_1200x630.jpg?v=1716782735
- name: Willow Storefront MCP
  description: Shopify storefront MCP endpoint on Willow's domain at onewillow.com/api/mcp. tools/list answered anonymously
    on 2026-10-20 with one tool, search_shop_policies_and_faqs, which answers questions about Willow's store policies, products
    and services. Platform runtime by Shopify, serving Willow's own store content.
  humanURL: https://onewillow.com/
  baseURL: https://onewillow.com/api/mcp
  tags:
  - MCP
  - E-Commerce
  - Shopify
  - Agentic Commerce
  properties:
  - type: MCPServer
    url: mcp/willow-storefront-mcp-tools-list.json
  x-surface: platform-generated
  x-platform: shopify
  aid: willow:willow-storefront-mcp
  image: https://onewillow.com/cdn/shop/files/OG-Image_db607121-7a26-49c9-b231-3a1e572a0fca_1200x630.jpg?v=1716782735
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 3
  pass: local-v5

Willow API — frequently asked questions

Does Willow have an API?

Yes. APIs.io lists 3 APIs from Willow, including Willow Pump UCP Commerce MCP, Willow Storefront GraphQL and Willow Storefront MCP.

How do I authenticate with the Willow API?

Willow documents its authentication (4 schemes). The details are profiled on APIs.io as Willow Authentication.

Does Willow have an MCP server?

Yes. APIs.io lists 2 MCP servers for Willow: 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 client POSTs JSON-RPC to ht

Is the Willow API ready for AI agents?

Willow has a Kin Score of 33.7 out of 100 (thin) and an Agent Readiness score of 39.9 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/willow"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/willow/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/willow/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.