> ## Documentation Index
> Fetch the complete documentation index at: https://docs.predictiondata.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Datasets

Data is provided as flat files — **CSV** (gzip-compressed) for all exchanges, plus **Parquet** (zstd-compressed) for Kalshi. **New here?** Start with the [Quickstart](/quickstart) to list and download.

## Polymarket

List exports by event slug, market slug, or asset ID (no API key needed to list). Download with `apikey` in the query. See [Finding Available Files](/datasets/polymarket/available-files).

| Name                                                | Description                            | History    |
| --------------------------------------------------- | -------------------------------------- | ---------- |
| [Onchain Fills](/datasets/polymarket/onchain-fills) | Fill data from the Polymarket contract | 2022-11-21 |
| [Order Books](/datasets/polymarket/order-books)     | Tick-level order book reconstructions  | 2025-11-14 |
| [Trades](/datasets/polymarket/trades)               | Trade messages from websockets         | 2025-11-14 |

## Kalshi

List exports by ticker; download using the `path` from the response. Auth is the `x-auth-token` header. See [Finding Available Files](/datasets/kalshi/available-files).

| Name                                        | Description                  | History    |
| ------------------------------------------- | ---------------------------- | ---------- |
| [Top of Book](/datasets/kalshi/top-of-book) | Best bid/ask                 | 2026-02-03 |
| [Top 5](/datasets/kalshi/top-5)             | Top 5 price levels           | 2026-02-03 |
| [Top 25](/datasets/kalshi/top-25)           | Top 25 price levels          | 2026-02-03 |
| [Full Orderbook](/datasets/kalshi/complete) | Full order book event stream | 2026-02-03 |
| [Trades](/datasets/kalshi/trades)           | Trade executions             | 2026-02-03 |