# Beygear 陀螺捕獲情報 — AI-readable summary (llms.txt)
# Official site: https://beygear.calc-mates.com

## About this site

Beygear tracks Beyblade X spinning-top availability, restocks, and pricing
across Taiwanese retail channels (momo, 誠品線上/eslite), scanning every 15
minutes. Popular models are commonly resold above list price after selling
out; this site exists to answer "where can I still buy at a normal price,
and for how much."

The site also hosts a client-side data-analysis tool for players using the
BeyGear companion app to log their launches.

## Pages

- Homepage: /
  Live listing of every tracked product across momo and eslite: current
  price, stock, whether it's at or below the shop's own list price, plus a
  recent-changes timeline (restocks, price drops, new listings).

- Model pages: /model/{code}
  One page per Beyblade X model with a confirmed model code (e.g. BX-19,
  UX-15). Price history, restock count, and per-listing current status.
  Bundles and unrelated matches picked up by fuzzy retailer search are
  filtered out — see /about for the relevance rule.

- Launch data analysis: /analyze
  Upload a BeyGear app backup JSON (processed entirely in the browser, never
  uploaded to any server) to compute metrics the app's own UI doesn't show:
  revolutions during spin-up, rise time, and acceleration (using the same
  formula the app displays, verified to match its on-screen values). Runs a
  Mann-Whitney U test to check whether a technique change actually moved the
  numbers, rather than comparing raw averages on small samples. Deliberately
  does not offer form/technique advice — see the page for why.

- Data provenance: /about
  How the price data is collected (momo and eslite's own public search
  responses), known limitations, and the distinction between a shop's own
  listed price and the manufacturer's suggested retail price.

## Data

- data/snapshot.json — current state of every tracked listing
- data/products.json — per-model history
- data/meta.json — generation timestamp and counts

Source and radar code: https://github.com/fish0707/beygear