{ "name": "Fair Odds Calculator Operator Vig and Fee Index", "title": "Operator Vig and Fee Index", "url": "https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/", "csv": "https://fairoddscalculator.com/datasets/operator-vig-and-fee-index.csv", "markdown": "https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/index.md", "computed_at": "2026-10-21", "license": "https://fairoddscalculator.com/terms", "headline": "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.", "quotes": [ "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)." ], "citation": "\"Fair Odds Calculator Operator Vig and Fee Index\", updated 2026-10-21, https://fairoddscalculator.com/datasets/operator-vig-and-fee-index/.", "changed_since": { "since": "2026-09-26", "previous_median": 2, "delta": 4, "direction": "up", "sentence": "The median is up 4 percent since 26 September 2026 (was 2 percent across 1)." }, "national": { "unit": "%", "n": 2, "median": 6, "min": 2, "max": 10, "p25": null, "p75": null, "mean": 6, "units": { "%": 2 }, "published_sources": 2, "named_sources": 34, "read_sources": 25, "not_published": 23, "published_share": 0.08 }, "by_axis": {}, "rows": [ { "source": "Matchbook commission explained (independent)", "url": "https://matchbookbetting.co.uk/commission/", "figure": "2%", "value": 2, "unit": "%", "vat": null, "axis": {}, "retrieved_at": "2026-10-12", "quote": "UK, Republic of Ireland, Channel Islands, and Isle of Man: 2% from net winnings", "source_class": "secondary", "text_sha256": "f91f0c2d86ec7100ceab860d7f2e6a7e674ae416eabd19f94bd80a94fb83e726" }, { "source": "PredictIt", "url": "https://www.predictit.org/", "figure": "10%", "value": 10, "unit": "%", "vat": null, "axis": {}, "retrieved_at": "2026-10-12", "quote": "Fee on profits 10%, unchanged", "source_class": "primary-provider-own-site", "text_sha256": "b5eb1385742edb36b4bbb8182227d4ac92539101d87c13f62d6387f2066ecec5" } ], "not_published": [ { "source": "Polymarket fee schedule", "url": "https://docs.polymarket.com/polymarket-learn/trading/fees", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Polymarket", "url": "https://polymarket.com/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Polymarket documentation", "url": "https://docs.polymarket.com/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Kalshi: how prediction markets are regulated", "url": "https://kalshi.com/market-integrity/regulation", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Kalshi regulatory", "url": "https://kalshi.com/regulatory", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Kalshi help centre", "url": "https://help.kalshi.com/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Kalshi: CFTC approval for exchange to trade event contracts", "url": "https://news.kalshi.com/p/kalshi-designation", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Kalshi fee schedule page", "url": "https://kalshi.com/fee-schedule", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Novig", "url": "https://novig.us/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Novig about", "url": "https://novig.us/about", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Novig FAQ", "url": "https://novig.us/faq", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "ProphetX", "url": "https://prophetx.co/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "PredictIt support FAQs", "url": "https://www.predictit.org/support/faqs", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "PredictIt support FAQ", "url": "https://www.predictit.org/support/faq", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Betdaq", "url": "https://www.betdaq.com/", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Manifold Markets", "url": "https://manifold.markets/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Limitless Exchange", "url": "https://limitless.exchange/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Circa Sports house rules", "url": "https://www.circasports.com/house-rules", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Circa Sports", "url": "https://www.circasports.com/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "Hard Rock Bet", "url": "https://hardrock.bet/", "retrieved_at": "2026-10-12", "reason": "read in full and no accepted figure on the page" }, { "source": "FanDuel", "url": "https://www.fanduel.com/", "retrieved_at": "2026-10-12", "reason": "every candidate on the page was refused" }, { "source": "the operator universe", "url": "https://www.cftc.gov/IndustryOversight/TradingOrganizations/DCMs/index.htm", "retrieved_at": "2026-09-12", "reason": "read in full and no accepted figure on the page" }, { "source": "Pinnacle Odds Dropper: market limits and vigs", "url": "https://www.pinnacleoddsdropper.com/guides/market-limits-and-vigs-what-are-they-and-why-are-they-important", "retrieved_at": "2026-09-12", "reason": "every candidate on the page was refused" } ], "sources": [ { "url": "https://docs.polymarket.com/polymarket-learn/trading/fees", "label": "Polymarket fee schedule", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://polymarket.com/", "label": "Polymarket", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://docs.polymarket.com/", "label": "Polymarket documentation", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://kalshi.com/about", "label": "Kalshi: about", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://kalshi.com/market-integrity/regulation", "label": "Kalshi: how prediction markets are regulated", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://kalshi.com/regulatory", "label": "Kalshi regulatory", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://help.kalshi.com/", "label": "Kalshi help centre", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://news.kalshi.com/p/kalshi-designation", "label": "Kalshi: CFTC approval for exchange to trade event contracts", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://kalshi.com/docs/kalshi-fee-schedule.pdf", "label": "Kalshi fee schedule (PDF)", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://kalshi.com/fee-schedule", "label": "Kalshi fee schedule page", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://novig.us/", "label": "Novig", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://novig.us/about", "label": "Novig about", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://novig.us/faq", "label": "Novig FAQ", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://prophetx.co/", "label": "ProphetX", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.predictit.org/", "label": "PredictIt", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.predictit.org/support/faqs", "label": "PredictIt support FAQs", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.predictit.org/support/faq", "label": "PredictIt support FAQ", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.betdaq.com/", "label": "Betdaq", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://manifold.markets/", "label": "Manifold Markets", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://limitless.exchange/", "label": "Limitless Exchange", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.circasports.com/house-rules", "label": "Circa Sports house rules", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.circasports.com/", "label": "Circa Sports", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://hardrock.bet/", "label": "Hard Rock Bet", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.fanduel.com/", "label": "FanDuel", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.fanduel.com/rules", "label": "FanDuel rules", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://sportsbook.draftkings.com/help/house-rules", "label": "DraftKings house rules", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://help.bet365.com/en/rules", "label": "bet365 rules", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.pinnacle.com/betting-resources/en/betting-strategy/learn-more-about-pinnacles-margins/lah22jal3xrpkq42", "label": "Pinnacle: learn more about Pinnacle's margins", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.betfair.com/aboutUs/Betfair.Charges/", "label": "Betfair Exchange charges", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://smarkets.com/about/commission", "label": "Smarkets commission", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.matchbook.com/commission", "label": "Matchbook commission", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.cftc.gov/IndustryOversight/TradingOrganizations/DCMs/index.htm", "label": "the operator universe", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://matchbookbetting.co.uk/commission/", "label": "Matchbook commission explained (independent)", "license": "the publisher's own terms; quoted for reporting and comment" }, { "url": "https://www.pinnacleoddsdropper.com/guides/market-limits-and-vigs-what-are-they-and-why-are-they-important", "label": "Pinnacle Odds Dropper: market limits and vigs", "license": "the publisher's own terms; quoted for reporting and comment" } ], "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", "embed": "

6 percent

median published figure, Operator Vig and Fee Index, across 2 sources, read 12 October 2026

Source: Fair Odds Calculator Operator Vig and Fee Index
" }