SizeKeeper for Retailers
Your customers already know the right sizes. Connect to that data and eliminate the guesswork — fewer returns, more confident buyers, higher conversions.
Request Early AccessReduce Returns
Wrong size is the #1 reason clothing gifts get returned — averaging $15–25 per item in logistics costs. When the buyer has the correct size on file, returns drop dramatically.
Convert Gift Shoppers
Grandparents and gift buyers are high-intent shoppers who hesitate at the size selector. Removing that uncertainty turns browsers into buyers.
Global Size Support
SizeKeeper stores sizes in US, EU, UK, Japanese, and Australian formats across all 8 clothing categories — ready for international storefronts.
How It Works
Families track sizes
SizeKeeper users record clothing sizes for everyone they shop for — grandchildren, kids, spouses — across 8 categories and multiple international size systems.
Shopper shares access
The shopper grants your storefront read-only access to their size profiles. No passwords, no stored PII on your end — just a scoped access token.
Your app queries the API
Call GET /api/v1/sizes to retrieve the
shopper's saved profiles and sizes. Pre-fill the right size in your
checkout flow or product recommendation engine.
API Overview
- REST JSON API — standard HTTPS endpoints, easy to integrate with any platform
- 8 clothing categories — Shirt, Pants/Jeans, Shoes, Dress, Coat/Jacket, Hat, Gloves, Ring
- Size type aware — Adult, Youth, Child, Baby/Toddler, Petite, Tall, Plus, Dress Shirt sizes per profile
- Multiple profiles per shopper — a grandparent may shop for 6+ grandchildren; your app selects the right one
- Global size formats — US, EU, UK, JP, and AU sizing returned in the shopper's preferred system
{
"profiles": [
{
"name": "Emma Smith",
"relationship": "Granddaughter",
"age": 8,
"region": "United States",
"sizes": {
"Shirt": { "type": "Youth (6-16)", "value": "S (8-10)" },
"Pants/Jeans": { "type": "Youth (6-16)", "value": "8 Regular" },
"Shoes": { "type": "Youth (6-16)", "value": "3.5Y" }
}
}
]
}
Pricing
Simple subscription tiers with included API calls and per-call overage. No hidden fees. Early access partners receive preferred pricing locked in at launch.
- 500 API calls / month
- Sandbox / test data
- 1 API key
- Community support
- 5,000 calls / month included
- Live consumer data
- 1 domain / storefront
- Email support
- 25,000 calls / month included
- Live consumer data
- 3 domains / storefronts
- Priority email support
- 100k+ calls / month
- Unlimited domains
- SLA guarantee
- Dedicated support
Pricing is subject to change before the API reaches general availability. Early access partners will be notified before any pricing changes take effect.
A fit for retailers who sell to gift buyers
Join the Early Access Program
The SizeKeeper Retailer API is in final development and accepting early access partners now. Early partners receive preferred pricing locked in at launch, priority integration support, and direct input on the API roadmap. We work with each partner individually to ensure a smooth integration.
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