post pub. Aug 21, 2026
Tracking Costco Gas Prices During a Global Fuel Crisis
https://www.jack.bio/blog/costco-gas-trackingJack LaFond reverse-engineers Costco's undocumented warehouse-lookup API to build a live tracker of gas prices across ~600 US Costco locations, then uses the resulting time-series data to show how a Strait of Hormuz supply scare rippled through Costco's famously loss-leader gas pricing.