EasySize
EasySize is an AI-powered size-recommendation platform for fashion e-commerce, marketed as "Fit Quiz." It helps clothing, footwear, sportswear, and swimwear retailers reduce returns and increase conversion by giving shoppers a personalized size recommendation without asking them for body measurements. EasySize ships as a native Shopify app and as a JavaScript library ("web app") that merchants embed on non-Shopify storefronts; the library is configured with a merchant-specific shop_id and product context and renders an in-page Fit Quiz widget. Merchants wire order-tracking and return-tracking events back to EasySize so the recommendation algorithm can learn, and can capture emails and drive personalized flows through a Klaviyo integration. EasySize supports 11+ languages with auto-detection, multiple size formats (UK/EU/US/international/custom), unisex and gender-aware logic, and additional fit/width/length recommendations. The company was a portfolio company of 500 Global.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles EasySize the way a machine reads it — 2 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — EasySize scores 27.2/100 (emerging), with a separate agent-readiness read of 4/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile EasySize
Each block below is one kind of artifact we hold for EasySize. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 1
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
EasySize Fit Quiz JavaScript Library
Client-side JavaScript library that embeds the EasySize "Fit Quiz" size-recommendation widget on a merchant storefront. Loaded via a script tag from the EasySize web app CDN, it...
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for EasySize — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Access & Security 1
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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