Is there an arbitrage after fees?

Buy opposite sides on two venues. If both asks add to under 100¢ and the fees are smaller than the gap, the payout is the same either way.

Side A — buy on

Ask price (¢)

Opposite side B — buy on

Ask price (¢)

Total to spend

Polymarket category

Net profit

$13.30

1.33% of the total

Both asks add to

96.0¢

under 100¢ before fees

Fees, both legs

$28.37

A $17.97 · B $10.40

Put on side A

$458.33

Kalshi

Put on side B

$541.67

Polymarket

Payout either way

$1041.67

before fees

Informational only, not trading advice. Confirm rates against your own fills.

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The terminal finds these across every market and refuses the ones that are one venue lagging the other, not a real gap.