About
SPI Markets
Formerly SneakerPulse
Independent markets terminal for sneaker and streetwear asks — plus the SPI premium-vs-retail index. Built to grow beyond sneakers into apparel. Starting with StockX sneakers — watchlists, size ladders, and a premium-vs-retail index — with room to grow into streetwear and apparel. Same project as before; we renamed to avoid confusion with other “SneakerPulse” products and to keep the focus on the SPI index.
What this is
- Top-seller watchlist with asks, volume, and rank
- Per-pair market pages with charts and size asks
- Compare, browser alerts, and installable PWA
- SPI — SPI Index, volume-weighted ask ÷ retail × 100 (100 = at retail). Same math can extend to streetwear items later.
How SPI is calculated
We take a ChronoPulse-style basket (up to 14 brands × 10 models from the top-seller pool), weight each model by weekly order flow, and measure ask ÷ retail × 100. Above 100 means the basket asks above retail; below 100 means sitting under retail. Historical boom-era tape (2020–2021) comes from public Flurin17 research data; 2022–mid-2025 has no free daily public tape, so that gap stays empty on purpose.
Data sources & modes
When upstream access is available, asks refresh from StockX market data providers. When it isn’t, SPI Markets serves a cached free-mode catalog (last snapshot 2026-07-22) so the site stays usable. Page views are designed not to burn third-party API quotas; bulk refresh is meant for a daily job.
Official StockX Developer API access is pending. Until then, listings may show a Cached badge instead of Live. SPI Markets is an independent fan project — not affiliated with StockX.
Quick look signals
Best investment screens for under-retail asks with healthy weekly flow. Bullish / bearish / mixed tiles use a rules engine on price direction and inventory proxies when trusted history exists, with transparent value-screen fallbacks otherwise. These are illustrative — not financial advice.
Disclaimer
SPI Markets (formerly SneakerPulse) is an independent fan project. It is not affiliated with, endorsed by, or partnered with StockX. Market data can be delayed, incomplete, or cached. Do your own research before buying or selling sneakers or streetwear.