OddsFantasy vs PredictEngine

What OddsFantasy does

Trading terminal for Polymarket's sports markets that adds the orders Polymarket lacks — take-profit and stop-loss, closes scheduled for kickoff, two-sided quotes — and runs no-code entry and exit rules for you. It grew out of a +EV and arbitrage toolkit for bookmakers, and the paid plan is still built around that: a finder that strips the margin from Pinnacle's odds to get a fair price, flags bookmaker and Polymarket prices above it and can buy the Polymarket ones for you within your limits. You sign in by email and trade from a Magic wallet, with gas paid by Polymarket's relayer. The site calls the terminal free; fills from it pay OddsFantasy a builder fee of 1% as a taker and 0.5% as a maker, and the +EV and arbitrage finders take the Classic plan, $80 for 30 days.

• Every Polymarket sports event on one screen: a sports bar, pre-match and live lists, search, and sorting and filters by date, volume and depth
• Trade window with candlestick or line charts, the live order book and the spread, and four order types: market with take-profit and stop-loss, limit with an expiry, quote — both sides at once, sized from your capital and target profit — and split
• Exits by market, by limit at your odds or at a set time such as just before kickoff; scheduled closes can be moved or cancelled from the Orders page
• Positions marked by exposure — red uncovered, yellow covered once a resting order fills, green fully offset — with one-click merging of opposite shares and redemption of settled ones
• Entry presets without code: odds band, spread, traded volume, book depth, a one-day reading of whether the odds are drifting out or shortening, and a stake per match; preview what passes, then run it now or on a schedule set around kickoff, before or during the match

• Free to use, not free to trade. The terminal page says placing and closing orders costs nothing, and the Terms speak of a 0.5% trading fee. Polymarket's public builder-fee registry — the rate the exchange applies when an order fills — lists OddsFantasy's code at 1% of each taker fill and 0.5% of each maker fill, the highest rates Polymarket allows, on top of Polymarket's own sports taker fee of 2.5% of the price at 50¢. A market order at 50¢ therefore starts about 3.5% behind; a resting order, 0.5%. The vendor's own blog works out that a 3% edge at 50¢ is worth about 0.5% after Polymarket's fee; with the terminal's 1% on top, the same entry at market loses money. The +EV automation enters with a resting order by default, which keeps the cost at 0.5%; switching it to market entry raises the bar.
• The idea behind the +EV side is argued in the vendor's own research, which is more candid than most. An Oct 8, 2026 post rebuilds 262 cycles of a two-sided spread preset traded with real money from Sep 14 to 26: −$17.40 in all, because only 59% of first fills were followed by the second when about 95% were needed to break even, and sharp wallets were about nine times more common among the takers who filled its quotes than in the market at large. Its conclusion is the product's premise — quote or buy only against an outside fair price, such as Pinnacle's odds with the margin removed, and judge the result by closing-line value rather than profit. The post names no wallet, so we could not recheck its figures.
• Usage is small. Polymarket's builders Data API lists OddsFantasy as a verified builder from Jan 16, 2026, with $19,509 traded through it by Oct 10, 2026 — $5,818 of it in September, the last on Oct 5 — and never more than five active accounts in a day, one or two a day since mid-September. What the terminal shows is Polymarket's own market: 48 of 48 outcome prices across the 20 events on its home page matched the prices Polymarket's API gave for the same markets when we checked on Oct 10. That record limits what the marketing can mean. A blog post and video from Oct 3 present an Over 2.5 goals preset with a 90% win rate and “about $2,300 profit in two months” at about 20% a trade; everything traded through OddsFantasy in August and September came to $9,765, buys and sells together, across all users — less than that profit would need in stakes alone. No wallet is named. The vendor asked for no performance figure on this listing, and it shows none.