Pricing

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

Actor stats

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Monthly active users

4 days ago

Last modified

categories

Optional

Kalshi categories to scan when suggesting pairs, e.g. "Politics", "Economics". Ignored when suggestions are off.

Type:array

Max events per venue

maxEventsPerVenue

Optional

How many open events to pull from each venue before matching. 300 is the most that fits in the 256MB this Actor runs under, so higher values are clamped to it.

Type:integer

Minimum:20

Maximum:300

Default:200

Max close-date gap (days)

maxCloseGapDays

Optional

Two contracts that settle weeks apart are not the same contract. A candidate pair whose close times differ by more than this is not suggested at all.

Type:integer

Minimum:0

Maximum:60

Default:3

Min match score

minMatchScore

Optional

Similarity floor for suggesting a pair, between 0 and 1. Raising it yields fewer, safer suggestions.

Type:string

Default:0.6

Min depth at the touch (USD)

minLiquidityUsd

Optional

A quote with nothing behind it is not a price. Legs with less than this resting at the best price are reported as unpriceable rather than used.

Type:string

Default:0

Kalshi fee coefficient

kalshiFeeCoefficient

Optional

Kalshi charges coefficient x price x (1 - price) dollars per contract, rounded up to the next cent; the published coefficient is 0.07. Exposed as an input because a stale fee constant would quietly overstate every edge. Polymarket fees are read separately from each market's source settings.

Type:string

Default:0.07

Include individual legs

includeIndividualLegs

Optional

Also return each venue's side of every reported pair (charged per leg).

Type:boolean

Default:true

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115

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(1)

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