Name: MKTGAP: editorial review
Rating: 4
Author: Polytoolhub

What is MKTGAP?

MKTGAP’s available calculator compares two user-entered prices after applying published venue fee formulas. It shows gross and net gaps, an all-in pair cost and a PnL illustration, with links to the formula sources.

The calculator shows how fees change the headline price difference. It does not fetch live prices, execute orders or establish that the two contracts settle identically. Live gap feeds, Pro alerts and API access were still planned.

Who it is for

Researchers comparing fees across venues
Users learning why a gross gap can disappear after costs

Features and coverage

Available on: Web
Markets & venues: Polymarket, Kalshi, PredictIt

Two-leg calculator
Enter platforms, sides, contract count and ask prices.
Fee breakdown
Inspect per-leg fees and net-gap calculations with source references.
Methodology guides
Read the assumptions and exclusions behind the comparison.

Workflows with MKTGAP

Compare a candidate pair

Enter the actual ask prices and relevant category, then inspect the fee-adjusted pair cost.

Stress the result

Account separately for slippage, deposits, withdrawals, settlement timing and contract differences.

Pricing and total cost

The public calculator is accessible without payment. Pro and Data Client prices were not announced; those services were marked as forthcoming.

Access: No account or wallet was needed for the reviewed calculator.

Getting started

Open the fee calculator.
Enter the contract count, venues, sides and current ask prices.
Read the fee assumptions and check costs excluded from the result.

Useful links

View pricing

What to check

Prices are manually supplied. Slippage, funding costs, rebates and time to settlement are not fully included. The calculator currently covers Kalshi, Polymarket and PredictIt, not every venue discussed on the site.

A closer look

Ratings & reviews

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Editorial rating

4.0/ 5

0 user reviews

Polytoolhub editorial

Our take on MKTGAP

A transparent and useful manual fee-comparison tool with stated exclusions and formula sources. Its value is strongest as a calculator, not as the future live-feed product.

Based on documented features, setup and access terms. How we rate

User reviews 0

The main score switches to user ratings after 5 published reviews.

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Frequently asked questions about MKTGAP

Does MKTGAP use live market prices?

The calculator explicitly says prices are entered by the user.

Can I use its API today?

The pricing page presented Data Client access and real-time Pro services as planned, without a launch price.

What does MKTGAP cost?