Paste Check (EMA Cross Starter) — Free Pine Script Indicator

Snapshots

The script on Bitcoin 1h: a teal fast EMA and an orange slow EMA, a green or red background that follows the last cross, and a triangle at every cross.

A red compilation error: curly quotes pasted from a word processor. The red box under line 4 says no viable alternative at character, followed by the curly quote.

A yellow warning: the crossover moved inside an if block. The script still compiles and runs, and F8 shows the advice.

The full clean script in the Pine Editor, 26 lines, Pine Script version 6.

How it works

Two EMAs (9 and 21 by default) are plotted, and ta.crossover / ta.crossunder mark where they cross.
A var trend variable remembers the direction of the last cross, and bgcolor shades the chart green or red from it.
It is deliberately small and uses an if block, strings and several function calls, so every common paste error shows up in it.

Settings

Setting	Default	What it does
Fast EMA	9	Fast EMA length
Slow EMA	21	Slow EMA length

Source code

In TradingView: open the Pine Editor, create a new indicator, paste the code, then click "Add to chart".

paste-check.pine.txtGitHub Download

//@version=6
indicator("Paste Check", overlay = true)

fastLen = input.int(9, "Fast EMA")
slowLen = input.int(21, "Slow EMA")

fast = ta.ema(close, fastLen)
slow = ta.ema(close, slowLen)

plot(fast, "Fast", color = color.teal, linewidth = 2)
plot(slow, "Slow", color = color.orange, linewidth = 2)

bullCross = ta.crossover(fast, slow)
bearCross = ta.crossunder(fast, slow)

var int trend = 0
if bullCross
    trend := 1
else if bearCross
    trend := -1

bullBg = color.new(color.green, 88)
bearBg = color.new(color.red, 88)
bgcolor(trend == 1 ? bullBg : trend == -1 ? bearBg : na)
plotshape(bullCross, "Buy", shape.triangleup, location.belowbar, color.green)
plotshape(bearCross, "Sell", shape.triangledown, location.abovebar, color.red)

Watch it built

This script is written and explained step by step in the video lesson.

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Non-repainting Pine Script v6, backtested with real costs, alert and webhook ready. Fixed quote within 24 hours.

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