Polymarket + Kalshi Arbitrage Finder
Pricing
from $0.05 / actor start
Polymarket + Kalshi Arbitrage Finder
Scans both Polymarket and Kalshi for matching binary prediction markets and identifies price discrepancies where buying YES on one platform and NO on the other guarantees a risk-free profit. Returns ranked arb opportunities with trade instructions, spread, and return %.
Pricing
from $0.05 / actor start
Rating
0.0
(0)
Developer
Max Galli
Actor stats
0
Bookmarked
41
Total users
5
Monthly active users
20 days ago
Last modified
Categories
Share
Scans both Polymarket and Kalshi simultaneously, matches binary prediction markets on the same topic, and surfaces price discrepancies where you can lock in a risk-free profit by buying YES on one platform and NO on the other.
How the arbitrage works
Both platforms resolve the same way: YES pays $1.00/share, NO pays $0.00/share (or vice versa). If Polymarket prices a market at YES = $0.55 and Kalshi prices the same market at YES = $0.68:
| Action | Cost | Payout if YES | Payout if NO |
|---|---|---|---|
| Buy YES on Polymarket | $0.55 | +$1.00 | $0.00 |
| Buy NO on Kalshi | $0.32 | $0.00 | +$1.00 |
| Total | $0.87 | $1.00 | $1.00 |
Guaranteed profit: $0.13 per share = 14.9% return regardless of outcome.
What you get per opportunity
| Field | Description |
|---|---|
spread | YES price difference between platforms (0–1 scale) |
return_pct | Estimated profit % per dollar risked |
direction | Which platform to buy YES on, which to buy NO on |
buy_yes_url | Direct link to the YES side market |
buy_no_url | Direct link to the NO side market |
poly_yes_price | Polymarket YES price |
kalshi_yes_price | Kalshi YES price |
cost_per_unit | Total cost to capture $1 payout |
profit_per_unit | Guaranteed profit per $1 payout captured |
similarity_score | How closely the market questions matched (0–1) |
poly_end_date | Polymarket market close date |
kalshi_end_date | Kalshi market close date |
Input options
| Parameter | Default | Description |
|---|---|---|
minSpread | 0.02 | Minimum price difference to flag (e.g. 0.05 = 5 cents) |
minReturnPct | 0.5 | Minimum profit % to include |
minSimilarity | 0.25 | Keyword match strictness (higher = fewer, more accurate matches) |
minLiquidity | 0 | Filter out illiquid markets |
minVolume24h | 0 | Filter by 24h trading volume |
maxResults | 500 | Cap on results, sorted by return % |
Important notes
- Not financial advice. Real arb requires both trades to fill simultaneously. Slippage, transaction fees, and timing can reduce or eliminate the profit.
- Markets are matched by keyword similarity — always verify the two markets resolve on the same underlying event before trading.
- Kalshi operates in the US and is CFTC-regulated. Polymarket is accessible to non-US users only.
- Results are sorted by
return_pctdescending — highest-return opportunities first. - A
similarity_scorebelow 0.4 means the match is looser — verify manually before trading.
Example output
