The Scenario
Every morning before the open, you run through the same scan: 14-day RSI, 50-day SMA, MACD histogram for 20 names on your swing trading watchlist. You're looking for entry signals — oversold RSI below 30, MACD crossovers, price sitting above the 50-day. The problem is that pulling these indicators manually takes 25 minutes of Polygon API calls before you even get to the analysis.
The bad version:
- Open Polygon, pull RSI for the first ticker, copy the value, paste it into column B next to the ticker.
- Repeat for SMA, then MACD, then move to the next ticker.
- Hit row 14 and realize the RSI values are pulling from a different lookback window than yesterday because the date parameter defaulted differently.
By the time the scan is done, the market has been open for 20 minutes and three of your entry signals have already moved past your target entry price.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook and connects to Polygon directly. You ask for the indicators you need across your full watchlist in one prompt.
For each ticker in column A, fetch the current 14-day RSI, 50-day SMA, and 20-day EMA from Polygon and write the values into columns B, C, and D, highlighting RSI below 30 in green and above 70 in red.
What You Get
- Column B: current 14-day RSI for each ticker.
- Column C: current 50-day SMA.
- Column D: current 20-day EMA.
- Rows where RSI is below 30 highlighted green, above 70 highlighted red.
- Values pulled as of the most recent completed trading session.
What If the Data Is Not Quite Ready
I also need the MACD histogram, not just RSI and SMA
For each ticker in column A, pull the MACD (12,26,9) signal from Polygon for the last 60 trading days and write date, MACD value, signal line, and histogram into a sheet called MACD Data.
Some tickers are options symbols, not equities — filter them out first
For each ticker in column A that is a standard equity symbol (not an options or futures ticker), fetch the 14-day RSI and 50-day SMA from Polygon and write the values into columns B and C. Leave the others blank with a note in column D.
I need yesterday's RSI, not today's — the market is mid-session
For each ticker in column A, pull the 14-day RSI as of yesterday's close from Polygon and write the value into column B.
Flag overbought and oversold, clean any null values, then sort by RSI ascending
Fetch 14-day RSI from Polygon for every ticker in column A, replace any null values with a note saying "insufficient data" in column B, and sort the results by RSI ascending so oversold tickers appear at the top.
One prompt handles the data pull, the null handling, and the sort — no intermediate steps.
Try It
Get the 7-day free trial of SheetXAI and open any Excel workbook with an equity watchlist in column A, then ask it to pull RSI and SMA from Polygon for the full list. See also how to pull OHLCV history for backtesting or import an options chain for a specific ticker.