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from $20.00 / 1,000 contract pair priced across venues

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Polymarket vs Kalshi Arbitrage — Same Question, Two Prices

Try for free

Compare the same question on Polymarket and Kalshi: bid/ask, gross gap and net gap after both venues' fees. Unknown Polymarket fees leave net null with a reason. $0.02 per gross-priced pair, suggestions included; refusals free. Unofficial.

Pricing

from $20.00 / 1,000 contract pair priced across venues

Rating

0.0

(0)

Developer

h ichi

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Monthly active users

5 days ago

Last modified

Polymarket vs Kalshi Arbitrage — Spread After Fees API through CLI

The Apify CLI is the official tool that allows you to use Polymarket vs Kalshi Arbitrage — Same Question, Two Prices locally, providing convenience functions and automatic retries on errors.

Install Apify CLI

Using installation script (macOS/Linux):

$curl -fsSL https://apify.com/install-cli.sh | bash

Using installation script (Windows):

$irm https://apify.com/install-cli.ps1 | iex

Using Homebrew:

$brew install apify-cli

Using npm:

$npm install -g apify-cli

Other API clients include:

Polymarket vs Kalshi Arbitrage — Same Question, Two Prices API in Python

Polymarket vs Kalshi Arbitrage — Same Question, Two Prices API in JavaScript

Polymarket vs Kalshi Arbitrage — Same Question, Two Prices OpenAPI definition

Polymarket vs Kalshi Arbitrage — Same Question, Two Prices API

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Kalshi Market Data Scraper — official public API, no login

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Live market data from Kalshi (CFTC-regulated prediction market exchange) via the official public REST API — no login, no API key. Query any series ticker and get every market: title, status, yes/no bid-ask, last price, volume, open interest, close time and result. No personal data.

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Kalshi + Polymarket markets in one table: odds, bid/ask, volume, result. Price history for both (Kalshi since 2021, Polymarket since 2024), candlesticks, order book depth, trades, Polymarket comments and top holders. Politics, sports, crypto, economics, weather. Public APIs. Pay per record.