Get Kalshi and Polymarket historical data — your trades and the market's price path.

Four datasets cover nearly every "prediction market historical data" question. Two are about you, two are about the market:

Your trades: log in at kalshi.com in a desktop browser (the mobile app does not expose exports), open the account menu, and go to Documents. Trading-history CSVs are provided per calendar year, so a multi-year account means multiple files; monthly-updated P&L statements (computed FIFO) live under Account > Tax Info. One conversion rule dominates everything downstream: Kalshi records prices and fees in whole cents — a 63-cent contract is stored as 63. Divide every price and fee column by 100 so contracts plot on the 0–1 dollar scale they settle on.

The market's history: Kalshi's public API documents a candlesticks endpoint that requires no authentication —

GET https://api.elections.kalshi.com/trade-api/v2/series/{series_ticker}/markets/{ticker}/candlesticks?period_interval=1440

Each candlestick carries trade-price open/high/low/close in dollars, volume, and open interest, at 1-minute (1), 1-hour (60), or 1-day (1440) periods. That response is already candle-shaped — for many markets it is the easiest historical dataset in this whole guide. Developers who want fills programmatically can use the authenticated GET /portfolio/fills instead of the Documents CSV.

Your trades: as of mid-2026 the main Polymarket site has no one-click CSV button, but your fills are public on-chain data, and the official data API serves them without authentication:

GET https://data-api.polymarket.com/trades?user={your wallet address}

The response lists every fill with side, outcome, price (0–1 dollars), size, timestamp, and the Polygon transaction hash, filterable by market and time, up to 10,000 rows per page. Third-party exporters wrap the same data as ready-made CSVs; the API is the primary source they all read.

The market's history comes from the public prices-history endpoint, queried by the market's token id (not its URL slug):

GET https://clob.polymarket.com/prices-history?market={token_id}&interval=1w&fidelity=60

Unlike Kalshi's endpoint this returns timestamp-and-price samples, not candles — you bucket them yourself (first sample per bucket as open, last as close, max/min as high/low). Two caveats: resolved markets may only return coarse granularity, and a market has separate tokens for its outcomes, so make sure the token id matches the side you actually traded.

Prediction-market tickers are not in KLinePic's built-in market data, so the chart is built from two files you control — which is also what makes it exactly reproducible. First the trades, in the schema from the data protocol (start from the prediction market template):

trade_id,symbol,event_type,position_side,time,price,quantity,fee,note
KX-FED-001,FED-25DEC-YES,buy,long,2026-06-03T14:20:00+00:00,0.42,200,0.14,entry on CPI print
KX-FED-001,FED-25DEC-YES,sell,long,2026-06-24T18:05:00+00:00,0.71,200,0.21,exit before meeting

Then the candles, converted from the venue's price history into the candle CSV:

symbol,time,open,high,low,close,volume
FED-25DEC-YES,2026-06-03T00:00:00+00:00,0.40,0.45,0.38,0.44,15200
FED-25DEC-YES,2026-06-04T00:00:00+00:00,0.44,0.47,0.41,0.46,9800

Three rules make the join work: prices in both files on the same 0–1 dollar scale, timestamps in both files with explicit UTC offsets, and the symbol spelled identically in both — it is the join key, and any ticker string works as long as it matches. Upload both files at /upload and the chart renders with B/S markers on the contract's price path, holding window, return, and drawdown; no account is required. The per-venue guides go deeper on export quirks: Kalshi trade history chart and Polymarket trade history chart.

• Kalshi provides trading-history CSVs per calendar year from the desktop site's Documents area, and monthly-updated P&L statements (computed FIFO) under Account > Tax Info; the export is not in the mobile app. Prices and fees are recorded in whole cents.
• Kalshi's public API documents a no-auth candlesticks endpoint (GET /trade-api/v2/series/{series_ticker}/markets/{ticker}/candlesticks) with dollar OHLC, volume, and open interest at 1m/1h/1d periods; fills are available via the authenticated GET /portfolio/fills.
• Polymarket has no one-click CSV on the main site; the public data API (GET https://data-api.polymarket.com/trades?user=<wallet>, no auth, up to 10,000 rows per page) returns per-fill side, outcome, 0–1 dollar price, size, timestamp, and Polygon transaction hash.
• Polymarket price history comes from the public prices-history endpoint on clob.polymarket.com, queried by token id; it returns timestamp-price samples that you aggregate into candles, and resolved markets may only return coarse granularity.
• KLinePic (klinepic.com) charts prediction-market positions from two uploaded files — the trade CSV and a custom K-line CSV (symbol,time,open,high,low,close,volume) — since prediction tickers are not in built-in market data.
• Free to start, no account required to render; batch rendering and a documented Agent API are available, with the CSV/JSON contracts at /docs.

• Kalshi trade history chart — the full Kalshi export walkthrough, column mapping, and tax-record basics.
• Polymarket trade history chart — the full Polymarket walkthrough, including on-chain verification.
• Market data and K-line coverage — how the custom K-line CSV path works in general.
• Binance historical data download — the crypto equivalent: free bulk klines from data.binance.vision.
• All guides — the full guide index.