# Operator Vig and Fee Index

> The median published figure in the Operator Vig and Fee Index is 6 percent across 2 sources' own pages (range 2 to 10 percent), read 12 October 2026.

Fair Odds Calculator · https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/ · computed 2026-10-21

**Median published figure:** 6 % (range 2 to 10 %; 2 published figures; 2 of 25 sources read publish one).

2 of the 25 named sources read in full publish a figure; 23 publish none, read 12 October 2026.

The median is up 4 percent since 26 September 2026 (was 2 percent across 1).

## Every figure, with its source

One row per source: the figure the source's own page publishes, the page, and the day it was read.

| Source | Figure | Read |
|---|---|---|
| [PredictIt](https://www.predictit.org/) | 10 % | 2026-10-12 |
| [Matchbook commission explained (independent)](https://matchbookbetting.co.uk/commission/) | 2 % | 2026-10-12 |

## The sentence each figure was read from (2)

- [PredictIt](https://www.predictit.org/), read 2026-10-12: "Fee on profits 10%, unchanged"
- [Matchbook commission explained (independent)](https://matchbookbetting.co.uk/commission/), read 2026-10-12: "UK, Republic of Ireland, Channel Islands, and Isle of Man: 2% from net winnings"

## Read in full, publishes no figure

- [Polymarket fee schedule](https://docs.polymarket.com/polymarket-learn/trading/fees), read 2026-10-12: every candidate on the page was refused
- [Polymarket](https://polymarket.com/), read 2026-10-12: every candidate on the page was refused
- [Polymarket documentation](https://docs.polymarket.com/), read 2026-10-12: read in full and no accepted figure on the page
- [Kalshi: how prediction markets are regulated](https://kalshi.com/market-integrity/regulation), read 2026-10-12: read in full and no accepted figure on the page
- [Kalshi regulatory](https://kalshi.com/regulatory), read 2026-10-12: read in full and no accepted figure on the page
- [Kalshi help centre](https://help.kalshi.com/), read 2026-10-12: read in full and no accepted figure on the page
- [Kalshi: CFTC approval for exchange to trade event contracts](https://news.kalshi.com/p/kalshi-designation), read 2026-10-12: every candidate on the page was refused
- [Kalshi fee schedule page](https://kalshi.com/fee-schedule), read 2026-10-12: every candidate on the page was refused
- [Novig](https://novig.us/), read 2026-10-12: every candidate on the page was refused
- [Novig about](https://novig.us/about), read 2026-10-12: every candidate on the page was refused
- [Novig FAQ](https://novig.us/faq), read 2026-10-12: every candidate on the page was refused
- [ProphetX](https://prophetx.co/), read 2026-10-12: every candidate on the page was refused
- [PredictIt support FAQs](https://www.predictit.org/support/faqs), read 2026-10-12: read in full and no accepted figure on the page
- [PredictIt support FAQ](https://www.predictit.org/support/faq), read 2026-10-12: read in full and no accepted figure on the page
- [Betdaq](https://www.betdaq.com/), read 2026-09-12: read in full and no accepted figure on the page
- [Manifold Markets](https://manifold.markets/), read 2026-10-12: every candidate on the page was refused
- [Limitless Exchange](https://limitless.exchange/), read 2026-10-12: every candidate on the page was refused
- [Circa Sports house rules](https://www.circasports.com/house-rules), read 2026-10-12: read in full and no accepted figure on the page
- [Circa Sports](https://www.circasports.com/), read 2026-10-12: every candidate on the page was refused
- [Hard Rock Bet](https://hardrock.bet/), read 2026-10-12: read in full and no accepted figure on the page
- [FanDuel](https://www.fanduel.com/), read 2026-10-12: every candidate on the page was refused
- [the operator universe](https://www.cftc.gov/IndustryOversight/TradingOrganizations/DCMs/index.htm), read 2026-09-12: read in full and no accepted figure on the page
- [Pinnacle Odds Dropper: market limits and vigs](https://www.pinnacleoddsdropper.com/guides/market-limits-and-vigs-what-are-they-and-why-are-they-important), read 2026-09-12: every candidate on the page was refused

## Methodology

Every row is a verbatim sentence read from the named source's own page through our fetch service on the date shown, hash-pinned to the stored read (the sha of the page's visible text; the raw page is mirrored to R2). 2 of the 25 named sources that could be read published a usable figure; 23 published none and are recorded as not published, never filled in; 9 could not be read (blocked, dead or unreachable) and count nowhere. The headline figures (median, minimum, maximum, quartiles) are over ONE figure per source in % (a source's median where its page yielded several accepted sentences), so N counts sources, never sentences; 99 candidate sentence(s) were refused by a reviewer with the reason recorded. The fuller derivation this dataset is chartered to grow into (not yet what the figures above are; they are each source's own published figure as read): one row per operator per market type: the explicit fee where the operator publishes one (Polymarket's taker and maker table, Kalshi's fee formula, an exchange's commission percentage, PredictIt's profit and withdrawal fees) and - for every sportsbook, none of which publishes a margin - the OVERROUND computed from that operator's own posted prices on identical markets, which is the only way the number exists at all. The derivation nobody publishes: the vig by operator, sport and market type side by side with the fee, restated as one comparable cost of taking a position, and the fair no-vig probability our calculator returns beside the operator's implied one; plus the measured share of operators that publish any cost figure at all, which this harvest already answers - of the operators read, the CFTC-regulated venues and the exchanges publish a fee schedule and not one traditional sportsbook publishes a margin

## Sources

- [Polymarket fee schedule](https://docs.polymarket.com/polymarket-learn/trading/fees) (the publisher's own terms; quoted for reporting and comment)
- [Polymarket](https://polymarket.com/) (the publisher's own terms; quoted for reporting and comment)
- [Polymarket documentation](https://docs.polymarket.com/) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi: about](https://kalshi.com/about) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi: how prediction markets are regulated](https://kalshi.com/market-integrity/regulation) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi regulatory](https://kalshi.com/regulatory) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi help centre](https://help.kalshi.com/) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi: CFTC approval for exchange to trade event contracts](https://news.kalshi.com/p/kalshi-designation) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi fee schedule (PDF)](https://kalshi.com/docs/kalshi-fee-schedule.pdf) (the publisher's own terms; quoted for reporting and comment)
- [Kalshi fee schedule page](https://kalshi.com/fee-schedule) (the publisher's own terms; quoted for reporting and comment)
- [Novig](https://novig.us/) (the publisher's own terms; quoted for reporting and comment)
- [Novig about](https://novig.us/about) (the publisher's own terms; quoted for reporting and comment)
- [Novig FAQ](https://novig.us/faq) (the publisher's own terms; quoted for reporting and comment)
- [ProphetX](https://prophetx.co/) (the publisher's own terms; quoted for reporting and comment)
- [PredictIt](https://www.predictit.org/) (the publisher's own terms; quoted for reporting and comment)
- [PredictIt support FAQs](https://www.predictit.org/support/faqs) (the publisher's own terms; quoted for reporting and comment)
- [PredictIt support FAQ](https://www.predictit.org/support/faq) (the publisher's own terms; quoted for reporting and comment)
- [Betdaq](https://www.betdaq.com/) (the publisher's own terms; quoted for reporting and comment)
- [Manifold Markets](https://manifold.markets/) (the publisher's own terms; quoted for reporting and comment)
- [Limitless Exchange](https://limitless.exchange/) (the publisher's own terms; quoted for reporting and comment)
- [Circa Sports house rules](https://www.circasports.com/house-rules) (the publisher's own terms; quoted for reporting and comment)
- [Circa Sports](https://www.circasports.com/) (the publisher's own terms; quoted for reporting and comment)
- [Hard Rock Bet](https://hardrock.bet/) (the publisher's own terms; quoted for reporting and comment)
- [FanDuel](https://www.fanduel.com/) (the publisher's own terms; quoted for reporting and comment)
- [FanDuel rules](https://www.fanduel.com/rules) (the publisher's own terms; quoted for reporting and comment)
- [DraftKings house rules](https://sportsbook.draftkings.com/help/house-rules) (the publisher's own terms; quoted for reporting and comment)
- [bet365 rules](https://help.bet365.com/en/rules) (the publisher's own terms; quoted for reporting and comment)
- [Pinnacle: learn more about Pinnacle's margins](https://www.pinnacle.com/betting-resources/en/betting-strategy/learn-more-about-pinnacles-margins/lah22jal3xrpkq42) (the publisher's own terms; quoted for reporting and comment)
- [Betfair Exchange charges](https://www.betfair.com/aboutUs/Betfair.Charges/) (the publisher's own terms; quoted for reporting and comment)
- [Smarkets commission](https://smarkets.com/about/commission) (the publisher's own terms; quoted for reporting and comment)
- [Matchbook commission](https://www.matchbook.com/commission) (the publisher's own terms; quoted for reporting and comment)
- [the operator universe](https://www.cftc.gov/IndustryOversight/TradingOrganizations/DCMs/index.htm) (the publisher's own terms; quoted for reporting and comment)
- [Matchbook commission explained (independent)](https://matchbookbetting.co.uk/commission/) (the publisher's own terms; quoted for reporting and comment)
- [Pinnacle Odds Dropper: market limits and vigs](https://www.pinnacleoddsdropper.com/guides/market-limits-and-vigs-what-are-they-and-why-are-they-important) (the publisher's own terms; quoted for reporting and comment)

## Cite or embed

- The median published figure in the Operator Vig and Fee Index is 6 percent across 2 sources' own pages (range 2 to 10 percent), read 12 October 2026.
- 2 of the 25 named sources read in full publish a figure; 23 publish none, read 12 October 2026.
- The median is up 4 percent since 26 September 2026 (was 2 percent across 1).

Cite as: "Fair Odds Calculator Operator Vig and Fee Index", updated 2026-10-21, https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/.

CSV: https://fairoddscalculator.com/datasets/operator-vig-and-fee-index.csv
JSON: https://fairoddscalculator.com/datasets/operator-vig-and-fee-index.json
Embed (plain HTML, static link back): see https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/#median