The Scenario
You're building the monthly FX performance deck for an institutional client. Eight currency pairs, 30 days of daily OHLC bars, RSI, and EMA for each. The deck goes to the CIO on Friday. You've been doing this manually — pulling pair data from a charting platform, exporting one CSV at a time, importing into Excel, and then running indicator formulas yourself — and last month it took most of Wednesday.
The bad version:
- You open your charting platform, set it to C:EURUSD, export the last 30 days of daily bars to CSV, import into a new Excel worksheet, and repeat for the other seven pairs.
- Two pairs have different decimal precision in the OHLC values and paste as text rather than numbers. You spend 30 minutes converting them with Text to Columns.
- You write RSI and EMA formulas manually across each worksheet, realize you referenced the wrong close column in two of them, and regenerate those worksheets from scratch.
The deck template is waiting. The analysis is not done because the data isn't ready.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent that lives inside your Excel workbook. It reads the forex ticker list, calls the Polygon.io forex aggregates and technical indicator APIs, and writes OHLC bars and indicator values into structured worksheets — one per pair.
For each forex ticker in column A (e.g., C:EURUSD, C:GBPJPY), fetch the last 30 days of daily OHLC bars from Polygon.io and write them into a new tab named after each pair.
What You Get
- One worksheet per pair, labeled with the pair symbol (e.g., EURUSD, GBPJPY).
- Columns: Date, Open, High, Low, Close — all formatted as numbers with consistent decimal precision.
- Dates formatted as YYYY-MM-DD, one row per trading day, in chronological order.
- Weekends and bank holidays omitted rather than filled with blanks.
What If the Data Is Not Quite Ready
I also need RSI and EMA for each pair written into the worksheet alongside OHLC
Get the 14-day RSI and 20-day EMA for all forex pairs in column A from Polygon.io and write the values into columns B and C of my "FX Signals" worksheet.
The pair list uses slash notation (EUR/USD) instead of Polygon.io's C: format
The forex pairs in column A are formatted as EUR/USD, GBP/JPY, etc. Convert each to Polygon.io format (C:EURUSD, C:GBPJPY) before fetching. Write the last 30 days of daily OHLC into separate worksheets named after each pair in the original format.
I need 90 days instead of 30 and I also want to calculate 20-day high and low for each pair
For each forex pair in column A, fetch the last 90 days of daily OHLC bars from Polygon.io and write the data into a worksheet named after each pair. Then add columns for "20D High" and "20D Low" that show the rolling 20-day high and low for each row.
Pull the last 30 days, calculate daily return for each pair, and write a summary worksheet ranking pairs by total return
For each forex pair in column A, fetch the last 30 days of daily OHLC from Polygon.io. Write the data into per-pair worksheets. Then calculate the daily close-to-close return for each day and write the total 30-day return into a "FX Summary" worksheet with pairs ranked from highest to lowest return.
One prompt covers the data pull, the return calculation, and the ranked summary — across all eight pairs simultaneously.
Try It
Open an Excel workbook with your currency pairs in column A and Get the 7-day free trial of SheetXAI. Ask it to fetch 30 days of OHLC bars and RSI from Polygon.io for each pair and structure them into per-pair worksheets for your deck. For converting invoice amounts using live FX rates, see the spoke on converting foreign currency invoices. For the full partner overview, see the Polygon.io hub.