Building a Real-Time Amazon Sales Tracker with Scraper API: Complete Python Guide

TL;DR Amazon doesn't expose sales data via any official API. Every "sales tracker tool" estimates from BSR (Best Seller Rank) signals. This tutorial shows you how to: Understand the BSR-to-sales estimation model Query real-time ASIN data via Pangolinfo Scrape API Build async batch queries for large ASIN sets Set up a daily monitoring pipeline with change alerts Why BSR-Based Estimation Works (And Where It Breaks) Amazon updates BSR frequently — hourly in hot categories, daily in slower ones. Sal