The Scenario
You run a momentum strategy across a crypto portfolio. Every Sunday you refresh your signal sheet: six months of daily OHLCV bars for 15 coins, 14-day RSI, and 20-day EMA for each one. BTC, ETH, SOL, and 12 others. The strategy is not complicated. The data collection is.
The bad version:
- Call Polygon's crypto aggregates endpoint for BTC, specify the 180-day window, paste the response into a tab called BTC.
- Realize Polygon's crypto ticker format is "X:BTCUSD" — update all your subsequent calls.
- Pull RSI and EMA separately for each coin, paste into the Signals tab, label the rows.
- Hit coin number 9, misread the column header, paste EMA values into the RSI column, realize the error three coins later.
Sunday evening with 15 coins, two indicators each, two endpoints each, and a format gotcha in the ticker naming is four hours of work that should be 10 minutes.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Google Sheet that connects to Polygon's crypto endpoints and handles the ticker format, date range, and indicator parameters in one pass.
For each crypto ticker in column A, fetch 180 days of daily OHLCV bars from Polygon and write them into a separate sheet tab named after each coin.
What You Get
- A tab per coin with 180 rows of daily OHLCV data.
- Columns: Date, Open, High, Low, Close, Volume.
- Tab names matching the coin labels from column A (e.g., BTC, ETH, SOL).
- Dates formatted as YYYY-MM-DD, consistent across all tabs.
What If the Data Is Not Quite Ready
I also need RSI and EMA on the summary sheet
Pull the 14-day RSI and 20-day EMA for all crypto tickers in column A from Polygon and write the results into columns B and C of my Crypto Signals sheet.
Some tickers in column A use base-currency format (BTC) and some use pair format (BTCUSD)
For each crypto ticker in column A, detect whether it is in base-currency or pair format and resolve to the correct Polygon ticker before pulling 180 days of daily OHLCV — write the data into tabs named after the base currency.
I need hourly bars for the last 30 days instead of daily bars for 180 days
For each crypto ticker in column A, fetch hourly OHLCV bars from Polygon for the last 30 days and write them into a separate tab named after each coin.
Pull 180-day OHLCV, calculate momentum score (20-day return), flag any coin with negative 20-day momentum, sort summary by momentum descending
For each crypto ticker in column A, pull 180 days of daily closes from Polygon, calculate the 20-day price return as a percentage, flag any coin with a negative 20-day return in column D, and sort the Crypto Signals sheet by 20-day return descending.
One prompt builds the momentum ranking and quality flags without a separate post-processing step.
Try It
Get the 7-day free trial of SheetXAI and open any Google Sheet tracking your crypto watchlist, then ask it to pull OHLCV data and momentum indicators from Polygon for all your positions. You might also want to pull forex OHLC data if your strategy spans digital and traditional currency pairs.