Prediction Markets Scraper: Kalshi & Polymarket Odds
Pricing
from $0.70 / 1,000 markets
Prediction markets scraper and API for Kalshi and Polymarket: one normalized table of odds (Yes/No probability), bid/ask, 24h volume, liquidity, close time and rules. Filter by keyword or category, open or closed. $1 per 1,000 markets. Public data, no login or API key.
Keep markets whose event title, question or option contains every word, for example "bitcoin", "fed rate" or "world cup". Leave empty for all markets.
Keep markets in these categories, for example politics, sports, crypto, economics, weather, tech. Polymarket matches its tag slugs (any tag works, such as bitcoin or nba); Kalshi matches its category names. Leave empty for all.
open: tradable markets now (default). closed: ended or settled markets; Polymarket is sorted by total volume, Kalshi returns the most recent history the API lists first.
Drop markets traded less than this in the last 24 hours (Kalshi contracts, Polymarket USD). Leave empty or 0 for no minimum.
Order of the rows, best first. closeTime puts the soonest-ending markets first. Kalshi counts contracts and Polymarket counts USD, so mixed-venue volume rankings are approximate.
Maximum number of markets returned across all venues. Each returned market is billed, so this is also your cost cap.
Pause between API requests, randomised up to 1.5x, to stay well inside the venues' published rate limits.
