About
SneakerPulse is a one-person data product by Alexander Isom.
I started it to answer a simple question with real numbers: what do sneakers actually sell for? It now tracks 24.7M+ completed resale sales on GOAT and StockX, updates itself every day, and turns that data into prices, tools and findings anyone can check.
Alexander Isom on LinkedIn Email me How it is built AI Lab: measured results
What I do
- Decide what to build and why. I read Search Console and GA4 to see what visitors are asking, then choose the pages, tools and analyses that answer it.
- Own the data. A daily pipeline loads marketplace sales into Postgres, checks that each feed actually delivered, and rebuilds every page from the result.
- Set the analytical bar. Trends compare each shoe with itself, so a change in product mix cannot fake one; time-series tests use effective sample sizes; findings that rest on many tests are corrected for false discoveries; every number states its window and sample size. Results that do not hold up are reported as null.
- Run it like a product. Design, copy, SEO, social posts and the weekly Call It game are one loop: ship, measure, keep what works.
How the work gets done
I build SneakerPulse with Claude Code, an AI coding agent that writes much of the code and runs scheduled checks on the data and the live site. I direct it: what to build, which questions to ask of the data, the standards results must meet, and what goes live. The how it is built page covers the architecture: Python on GitHub Actions, Neon Postgres, a Cloudflare Workers API and static pages on Cloudflare Pages.
Work worth a look
Best time to sell
How prices move in the 26 weeks after release, across 1,700+ releases, with each shoe compared with itself.
Holiday planning guide
How much the holiday season lifts sales and prices, measured on a fixed panel of 14,000+ shoes.
Size curve
Which sizes sell and which run short, from 550,000+ pairs, written for merchandise planning.
Fee-free days
What happens to sales and prices when a marketplace drops its seller fees.
Monthly Resale Index
One number for whether resale prices rose or fell, with a confidence interval.
Shoe Finder
A six-question recommender that matches a shopper to real shoes and real resale prices.
Earlier research
The first things I published were price forecasts for upcoming releases and backtests that checked them against what the shoes later sold for. They are kept as they were.
- Air Jordan 5 'Light Graphite' Resale Price Prediction 2026
- Air Jordan 5 Light Graphite Resale Market Analysis 2026 | Research Report
- Air Jordan 5 'Light Graphite' Resale Price Model (Feb 2026 Release)
- Air Jordan 5 'Light Graphite' Resale Model, Regime Method (Feb 2026)
- Levi's x Air Jordan 3 'Black Denim' Resale Price Prediction 2026
- 2026 Levi's x Air Jordan 3 Black Denim Resale Market Analysis Report
- Fragment x Union LA Jordan 1 'Varsity Red' Price Prediction 2026
- Fragment Design x Union LA x Air Jordan 1 'Varsity Red / Sport Royal' Resale Price Forecast
- Fragment x Union Air Jordan 1 'Varsity Red' Resale Price Model (Feb 2026)
- Levi's x Air Jordan 3 'Black Denim' Resale Price Model (Feb 2026 Release)
- Nike GT Future 'Copper Egg' Resale Price Model (Feb 2026 Release)
- Stranger Things x Nike Foamposite One Resale Price Model (Feb 2026)
- Compare Sneaker Resale Prices Side by Side: SKU Compare
Get in touch
The quickest way to reach me is LinkedIn, or email isometrixllc@gmail.com. If you want something like this built, see work with us.