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Polymarket + Kalshi Arb Monitor (Fee-Aware)

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Scans Polymarket and Kalshi, matches the same games on both venues, and reports arbitrage edges net of Kalshi's official fee schedule. Deterministic matching, honest gross-vs-net math, MCP-friendly summary. For traders, quants and AI agents.

Pricing

from $1.00 / 1,000 results

Rating

0.0

(0)

Developer

Andrew Goodrich

Actor stats

Bookmarked

Total users

Monthly active users

16 days ago

Last modified

Why this one is different

Deterministic event matching. Joins venues on slug/ticker structure (sport + team codes + date), not fuzzy title soup — then verifies each team mapping by name. Ambiguous matches are skipped, never guessed.
Honest math. Gross edge is a lie. Every quote shows gross edge, Kalshi fees, and net edge side by side. Most "arbs" you see elsewhere die here.
Built for the Kalshi API migration. Kalshi's /markets endpoint now returns only parlay collections; this actor pulls standard game markets from the events API and handles the new dollar-denominated price fields.
Agent-ready. Machine-readable run summary in the key-value store (last-run-summary.json), clean dataset schema, no login required.

Input

Field	Default	Meaning
`minNetEdgeBps`	50	Report only edges above this, net of Kalshi fees (100 bps = 1%)
`minVolumeUsd`	1000	Liquidity floor on Polymarket side
`maxMarketsPerVenue`	2000	Scan cap per venue
`matchThreshold`	0.85	Reserved for fuzzy fallback (matching is structural)

Output

Dataset rows (one per qualifying opportunity):

polymarketTitle, kalshiEventTitle, kalshiEventTicker, kalshiTeamMarket,
direction, polymarketPrice, kalshiNoPrice,
grossEdgeBps, kalshiFeesBps, netEdgeBps, tieRisk,
polymarketUrl, kalshiUrl, scannedAt

Plus last-run-summary.json in the key-value store: venues scanned, matches, opportunities, best net edge.

Scope (v1)

Game moneylines: NFL, MLB, NHL, NBA (KX<LEAGUE>GAME ↔ Polymarket game slugs)
Spreads/totals/player props are roadmap v2 (line alignment required)
tieRisk: true flags sports where a draw kills both legs (NFL overtime rules, soccer draws) — price that risk or skip those rows

Pricing

Pay-per-event: small per-run charge + per matched pair delivered. Schedule it (e.g. hourly) to watch edges appear and vanish around team news.

Disclaimer

Data is provided as-is from public venue APIs. Prices move fast; verify on the venue before trading. Nothing here is financial advice. Bet responsibly.

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