According to @santimentfeed, the top ecosystems by total development activity events over the past 30 days are Ethereum, BNB Chain, Polygon, Optimism, and Arbitrum (source: Santiment tweet on Sep 23, 2025; dev activity dashboard app.santiment.net/dev-activity). According to @santimentfeed, the free dashboard can be bookmarked and checked anytime, enabling traders to monitor 30-day development event counts for these ecosystems as part of their market tracking (source: Santiment tweet and dev activity dashboard).