Dynamic Requests in Pine Script v6 Libraries: Build Reusable Scanners Without Breaking the Design

Direct answer

Dynamic requests in Pine Script v6 matter because they let reusable code request market data with much less ceremony than older patterns. That becomes especially useful when you are building scanners, dashboards, or shared library helpers.

The catch is that flexibility is not the same thing as design discipline. A loose request design can make a scanner look powerful while quietly making it harder to trust.

Why this matters after v6

The v6 shift made dynamic requests the default, which changed how many builders think about request.*() inside local scopes and reusable structures. That is one reason this topic is still moving right now: traders are not just searching for the syntax. They are trying to figure out what a safe architecture looks like.

That is the interesting part. The trend is not the function call itself. The trend is that Pine Script now gives you more freedom, which means design mistakes also get easier to write.

The safe mental model

I would treat dynamic requests in a library like a thin market-data layer. The export should request something clearly and return it clearly. If the function starts doing ten jobs, the scanner usually gets harder to test.

//@version=6
library("CrossMarketData", dynamic_requests = true)

export requestedClose(simple string symbol, simple string timeframe) =>
    request.security(symbol, timeframe, close)

export previousClose(simple string symbol, simple string timeframe) =>
    request.security(symbol, timeframe, close[1])

//@version=6
indicator("Scanner summary", overlay = false)

import yourUserName/CrossMarketData/1 as cmd

string[] symbols = array.from("NASDAQ:AAPL", "NASDAQ:MSFT", "BINANCE:BTCUSDT")
float totalChange = 0.0

for i = 0 to array.size(symbols) - 1
    symbol = array.get(symbols, i)
    lastClose = cmd.requestedClose(symbol, "60")
    prevClose = cmd.previousClose(symbol, "60")
    totalChange += nz(lastClose - prevClose)

plot(totalChange, color = color.new(color.teal, 0), linewidth = 2)

The design rule most people miss

The useful rule from the library docs is that exported functions can use request.*(), but the request expression still cannot depend on exported parameters in the wrong way. That matters because it stops a library from becoming a shape-shifting black box.

In plain English: the request target can be dynamic, but the expression itself should stay structurally honest.

//@version=6
library("TooMuchMagic", dynamic_requests = true)

export scaledClose(simple string symbol, simple string timeframe, float scale) =>
    request.security(symbol, timeframe, close * scale)

Where traders and builders usually get this wrong

• requesting too many symbols and timeframes just because the language now allows it
• hiding alert logic, filtering logic, and data-request logic inside one export
• treating a scanner as good because it is compact, not because it is testable
• forgetting that clean naming and stable outputs matter more once the script becomes reusable

How I would build the first real version

I would start with one library whose only job is requesting a few predictable series cleanly. Then I would keep the ranking, filtering, and display logic in the consumer script where it stays easier to inspect.

That split matters. It lets the reusable part stay boring and dependable while the strategy-specific part remains easy to adjust.

What to read next

If dynamic requests are part of your next Pine Script project, these are the best follow-ups.

• How to Use Dynamic request.security in v6
• request.security_lower_tf on Daily Charts
• Pine Script Libraries in 2026

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