Pricing

from $1.40 / 1,000 matched pairs

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Polymarket Kalshi Arbitrage Scanner | Matched Markets & Edge

Try for free

Match the same prediction market on Polymarket and Kalshi, compare YES/NO ask prices and get fee-adjusted, risk-free arbitrage edge for every pair. Entity-exact matching (names, strikes, dates) — no false-positive soup. $2/1,000 matched pairs.

Pricing

from $1.40 / 1,000 matched pairs

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0.0

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Developer

Mr Zack

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Monthly active users

11 days ago

Last modified

Polymarket × Kalshi Arbitrage Scanner — Matched Markets & Fee-Adjusted Edge

Find the same prediction market on Polymarket and Kalshi, compare live YES/NO ask prices, and get the fee-adjusted, risk-free arbitrage edge for every matched pair — in one run, from two public APIs, with no login and no API keys.

Built for prediction market traders, arbitrageurs and researchers who are tired of eyeballing two browser tabs: the scanner matches markets by entity (names, numeric strikes, dates), blocks false pairs (negation, above/below direction, mismatched strikes), and computes the exact cost of buying YES on one platform and NO on the other — including Kalshi's 7% trading fee.

Why this scanner instead of eyeballing?

Entity-exact matching, not keyword soup. "Fed rate be 1.75%" will never be paired with "Fed rate above 2.75%". Numeric strikes must agree, end dates must be close, negations and directions must match.
Fee-adjusted edge. A 1.5% gross gap that dies after Kalshi fees is not an arb. netEdgePct already subtracts the fee.
Verified arbs first. Rows are sorted with high-confidence, net-positive arbs on top (isArb: true). Edges above 15% are flagged suspiciousEdge — cross-platform gaps that big are almost always a market mismatch, so we never charge you optimism.
Whole-market coverage. Scans ~2,000 highest-volume Polymarket binary markets and every open Kalshi market (tens of thousands) per run.

Output fields

Field	Description
`matchScore` / `confidence`	Match similarity (0–1) and `high`/`medium` tier
`question`, `polyEventTitle`, `polyUrl`	Polymarket market
`polyYesAsk`, `polyNoAsk`, `polyVolumeUsd`, `polyEndDate`	Polymarket prices & volume
`kalshiTicker`, `kalshiQuestion`, `kalshiUrl`	Kalshi market
`kalshiYesAsk`, `kalshiNoAsk`, `kalshiCloseTime`	Kalshi prices
`direction`	Best arb legs, e.g. `YES@Polymarket + NO@Kalshi`
`totalCostUsd`, `kalshiFeeUsd`	Combined cost of both legs + fee
`grossEdgePct`, `netEdgePct`	Edge before / after Kalshi fees
`isArb`	`true` = verified net-positive arb (high confidence, sane edge)
`suspiciousEdge`	`true` = edge >15%, verify the pair manually
`scannedAt`	UTC timestamp of the scan

Pricing

$0.04 per run + $2.00 per 1,000 matched pairs. A full scan typically returns 300–600 pairs (≈ $0.6–1.2 per full price-gap table). Set minNetEdgePct: 0 to receive only net-positive arbs — then a run costs $0.04 plus a fraction of a cent per actionable opportunity.

Run it on a schedule (recommended)

Arbs live for minutes to hours. In Apify Console: Actors → this actor → Schedules → Create new, pick every 15–60 minutes, set input { "minNetEdgePct": 0 }, and add an email/Slack/webhook integration that fires when the dataset is non-empty. You'll only pay for rows that are actually actionable.

Use with AI agents & MCP

This actor works out of the box with the Apify MCP server — plug it into Claude, ChatGPT, LangGraph or any agent framework and ask things like "scan for prediction-market arbitrage above 1% and summarize the top 5". The output schema is stable and machine-readable, so agents can chain it into alerting, sizing or execution research workflows.

Kalshi Weather Markets Scraper — live Kalshi weather market odds by city.
Whop New Launches Monitor — catch every new Whop product the hour it launches.
Ad Budget Signals — which advertisers are scaling spend right now.

Legality & fair use

Both data sources are public, unauthenticated JSON APIs (Polymarket Gamma API, Kalshi trade API v2). The scanner uses polite pacing, no proxies and no credentials. This actor provides market data, not financial advice — always verify prices on-platform before trading.

Changelog

0.0.5 (10 Sep 2026) — Maintenance: billing safety (chargeSafely — a failed charge can no longer kill a run that already has data), test suite wiring, README.
0.0.1 (29 Aug 2026) — Launch.

Found this useful? A review helps more than you'd think

If this Actor saved you time, a short review on the Reviews tab of this Store page takes 30 seconds and is the only signal other buyers have before they spend anything. If something is broken instead, open a ticket on the Issues tab — parser bugs and field requests get fixed.

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