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The Kalshi API uses cursor-based pagination to help you efficiently navigate through large datasets. This guide explains how pagination works and provides examples for handling paginated responses.

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How Pagination Works

When making requests to list endpoints (like /markets, /events, or /series), the API returns results in pages to keep response sizes manageable. Each page contains:
  • Data array: The actual items for the current page (markets, events, etc.)
  • Cursor field: A token that points to the next page of results
  • Limit: The maximum number of items per page (default: 100)

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Using Cursors

To paginate through results:
  1. Make your initial request without a cursor
  2. Check if the response includes a cursor field
  3. If a cursor exists, make another request with ?cursor={cursor_value}
  4. Continue until the cursor is null (no more pages)

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Example: Paginating Through Markets

import requests

def get_all_markets(series_ticker):
    """Fetch all markets for a series, handling pagination"""
    all_markets = []
    cursor = None
    base_url = "https://api.elections.kalshi.com/trade-api/v2/markets"

    while True:
        # Build URL with cursor if we have one
        url = f"{base_url}?series_ticker={series_ticker}&limit=100"
        if cursor:
            url += f"&cursor={cursor}"

        response = requests.get(url)
        data = response.json()

        # Add markets from this page
        all_markets.extend(data['markets'])

        # Check if there are more pages
        cursor = data.get('cursor')
        if not cursor:
            break

        print(f"Fetched {len(data['markets'])} markets, total: {len(all_markets)}")

    return all_markets

# Example usage
markets = get_all_markets("KXHIGHNY")
print(f"Total markets found: {len(markets)}")

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Pagination Parameters

Most list endpoints support these pagination parameters:
  • cursor: Token from previous response to get the next page
  • limit: Number of items per page (typically 1-100, default: 100)

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Best Practices

  1. Handle rate limits: When paginating through large datasets, be mindful of rate limits
  2. Set appropriate limits: Use smaller page sizes if you only need a few items
  3. Cache results: Store paginated data locally to avoid repeated API calls
  4. Check for changes: Data can change between requests, so consider implementing refresh logic

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Endpoints Supporting Pagination

The following endpoints support cursor-based pagination:

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Common Patterns

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Fetching Recent Items

If you only need recent items, you can limit results without pagination: 
# Get just the 10 most recent markets
url = "https://api.elections.kalshi.com/trade-api/v2/markets?limit=10&status=open"

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Filtering While Paginating

You can combine filters with pagination: 
# Get all open markets for a series
url = f"{base_url}?series_ticker={ticker}&status=open&limit=100&cursor={cursor}"

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Detecting New Items

To check for new items since your last fetch:
  1. Store the first item’s ID or timestamp from your previous fetch
  2. Paginate through results until you find that item
  3. Everything before it is new

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Next Steps

Now that you understand pagination, you can efficiently work with large datasets in the Kalshi API. For more details on specific endpoints, check the API Reference.
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