zec-btc.pine

//@version=6
indicator("BTC-ZEC RSI Div", overlay=true)

// === Inputs ===
symA      = input.symbol("BITSTAMP:BTCUSD", "Symbol A")
symB      = input.symbol("BITFINEX:ZECUSD", "Symbol B")
res       = input.timeframe("", "Resolution (empty = chart)")
rsiLen    = input.int(14, "RSI Length", minval=2)
len       = input.int(20, "Z-Score Length", minval=10)
smooth    = input.int(5, "EMA Smoothing", minval=1)
capZ      = input.float(3.0, "Max Color Z", minval=0.5, step=0.5)
threshold = input.float(1.5, "Threshold |z|", minval=0.1, step=0.1)

// === Data (fill gaps to extend back in history) ===
useRes = (res == "") ? timeframe.period : res
cA = request.security(symA, useRes, close, gaps=barmerge.gaps_off)
cB = request.security(symB, useRes, close, gaps=barmerge.gaps_off)

// Validity guard
valid = not na(cA) and not na(cB)

// === RSI for both symbols ===
rsiA = valid ? ta.rsi(cA, rsiLen) : na
rsiB = valid ? ta.rsi(cB, rsiLen) : na

// === Divergence on RSI (z-score of RSI spread) ===
spread    = rsiA - rsiB
spreadSm  = ta.ema(spread, smooth)
sprStdev  = ta.stdev(spreadSm, len)
zDiff     = sprStdev != 0 ? (spreadSm - ta.sma(spreadSm, len)) / sprStdev : na
mag       = math.abs(zDiff)

// === Thresholding & color depth mapping ===
overThreshold = mag > threshold
den    = math.max(capZ - threshold, 0.000001)
norm   = math.min((mag - threshold) / den, 1.0)
transp = 100 - math.round(norm * 100.0)

// Color: positive=lime, negative=red
col = zDiff >= 0 ? color.new(color.lime, transp) : color.new(color.red, transp)

showCondition = overThreshold and zDiff < 0

// === Background mark only when exceeding threshold ===
bgcolor(showCondition ? col : na, title="RSI Divergence Heat")

// === Optional alert (kept minimal) ===
alertcondition(overThreshold, title="RSI Divergence Exceeds Threshold",
     message="BTC-ZEC RSI divergence exceeds threshold on {{ticker}} @ {{interval}}")