I Scanned RSI Across 300 Altcoins Last Night. The Market Is Screaming and Nobody's Listening.

Fear & Greed is at 11. BTC is sitting at $70,428 after a 3.82% bounce. And if you're only watching Bitcoin right now, you're missing the real story happening underneath. I pulled RSI data on 300 altcoins last night. Not 10, not 50 -- three hundred. The results were so lopsided I thought my script was broken. It wasn't. The Setup I've been running a nightly cron job that hits the CoinGecko API, grabs OHLCV data for every coin with at least $500K in 24h volume, and computes 14-period RSI. Nothing fancy. Standard Wilder's smoothing. The output is a heatmap I render with D3 and dump into a dashboard I check with coffee every morning. Here's the core of the RSI calculation if you want to build your own: function calculateRSI ( closes , period = 14 ) { const changes = closes . slice ( 1 ). map (( c , i ) => c - closes [ i ]); let avgGain = 0 ; let avgLoss = 0 ; for ( let i = 0 ; i < period ; i ++ ) { if ( changes [ i ] > 0 ) avgGain += changes [ i ]; else avgLoss += Math . abs ( changes [ i