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Tools
Calculators for prediction-market traders: pick the question you have, and the tool that answers it. Every fee figure comes from the platform’s own schedule, with the source.
Probability and odds converter
Move the price — everything recalculates1¢50¢99¢
- Implied probability
- 68%
- Complement (not a quote)
- 32¢
- Decimal odds
- 1.47
- American odds
- −213
- Fractional
- 8/17
- Return per $1
- $1.47
A binary contract settles at $1 or $0, so its price in cents is the market’s probability in percent. Fractional odds are the exact reduced ratio, which is why 68¢ reads 8/17 rather than the rounder 1/2 — the two would not pay the same.
Profit calculator
- Contracts bought
- 147
- Payout if YES
- $147.00
- Profit before fees
- $47.04
This example uses whole contracts, so the position budget is floored to the nearest one — $0.04 of a $100.00 stake stays uninvested here. Fees are additional to this position budget. The example beside this estimates an entry fee; exits, funding costs and slippage are excluded.
Polymarket entry-fee example
One taker fill, whole shares, held to a winning $1 settlement. Market-specific parameters may differ. This is an example, not an executable quote.
The source check is due for renewal. Calculation is paused; consult the current schedule.
Official formula and category rates · Checked . Calculated in USDC; dollar values are illustrative.
Platform fee conditions
Recorded fee research from official sources. Variable charges need a specific product, order and payment method; they cannot be ranked using a single percentage. Sources may change after the stated check.
| Platform | Fee conditions | Source check |
|---|---|---|
| ADI PredictStreet | FAQ: a trading commission (a small percentage of each trade, rate shown on each market page before trading) plus gas fees on deposits/withdrawals charged in stablecoin/ADI (https://adipredictstreet.com/faq). | Official source |
| Alpha Arcade | Taker-only fee = 0.07 × quantity × price × (1 − price); makers pay nothing (e.g. one contract at $0.50 costs $0.0175). Fees collected on-chain (Terms of Use). | Official source |
| Augur | Augur runs no trading product today: its FAQ says an Augur-native market app “has not yet relaunched” and that “Augur.net is not a trading interface”. Under the v2 design on augur.net, “the only time Augur levies fees is when market participants are settling with the market contract”: a creator fee set by each market’s creator, and a reporting fee that starts at 1% and adjusts between 0.01% and 33.3%. Any new protocol’s fees are not yet set (augur.net, read 2 Oct 2026). | Official source |
| Azuro | No separate bet fee documented; odds carry a margin ("Spread is the vig (aka margin) for an individual bet") and pool profits are shared with LPs, Data Providers, apps and AzuroDAO (https://gem.azuro.org/knowledge-hub/how-azuro-works/reward-distribution). | Official source |
| Betr Predictions | Betr's help article says a taker fee applies "on select markets" and follows the formula "fee = C × feeRate × p × (1 - p)". It says "Only takers ever pay. Makers are exempt across the board." The article lists taker rates by category: Crypto 0.07, Sports 0.05, Economics/Culture/Weather/Other 0.05, Finance/Politics/Mentions/Tech 0.04 and Geopolitics 0. It adds that "Neither Betr nor Polymarket profits from these fees", and that depositing or withdrawing "never costs anything on Betr's end" (help.betr.app, read 1 Oct 2026). That article does not match the exchange Betr's own terms name. It quotes fees in USDC and uses the international Polymarket rate table, while Polymarket US trades in US dollars with a single taker coefficient of 0.0695. Polymarket US partner docs also let an ISV or IB declare its own per-order "vendor fee" (docs.polymarket.us/partners/funding/vendor-fees, read 1 Oct 2026). Betr does not disclose whether it charges one. We therefore treat the taker rate as unconfirmed. The maker fee of zero is stated by both Betr and Polymarket US. | Official source |
| Bodega Market | Bodega’s Terms say only: “A transaction fee may be applied to each bet placed. The fee structure will be transparent and visible before you place a bet.” No rate appears anywhere in its documentation. Its staking page says “typically, 50% of the collected fees are allocated for distribution to stakers”, the rest to the treasury. No creator, settlement, deposit or withdrawal fee is stated (docs.bodegacardano.org, read 2 Oct 2026). | Official source |
| CRSHMARKET | Terms §9.1: protocol fee of 5% of the total USDC position size at entry, non-refundable, plus Monad gas. | Official source |
| Crypto.com Prediction Markets | For the Prediction Trading feature covered by the linked help page, taker fees range from $0.01 to $0.0175 per contract; maker and settlement fees are zero. These are per-contract amounts, not percentages of the trade. | Official source |
| Delphi | Creator-set trading fee on every trade, default 2%, of which the creator receives 1.5% of volume; a market creation fee also applies (docs). | Official source |
| Dexsport | Dexsport publishes no trading, deposit or withdrawal fee. As a bookmaker it is paid through the margin built into its odds: on six football 1X2 markets on its homepage on 19 Oct 2026 the prices implied 105.6%–108.8%, an overround of about 7% on average. Network fees for moving crypto are paid separately. | Official source |
| DraftKings Predictions | DraftKings Predictions charges per contract, “per side (i.e., opening or closing a position)”, by contract price. On markets listed by Crypto.com Derivatives North America and DKeX (formerly Railbird) the fee runs from $0.0008 at 1¢ to $0.0200 between 30¢ and 94¢; on CME markets it is $0.01 from 1¢ to 19¢, $0.02 from 20¢ to 94¢ and $0.01 from 95¢. “Total Fees include all applicable FCM commissions and Exchange Fees”, rounded up to the cent; DKeX charges no settlement fee (DraftKings fee schedule, archived 25 Sep 2026; railbirdexchange.com, read 2 Oct 2026). | Official source |
| FanDuel Predicts | FanDuel Predicts charges one stated fee: “Two cents per dollar of your potential payout. That’s it.” Its example: “$100 potential payout = $2 fee at checkout. The same fee applies if you cash out early.” Its pricing guide puts it as “a 2 percent transaction fee … based on the potential payout”, so a contract paying $1 costs $0.02 to buy and $0.02 more to cash out before settlement. FanDuel states no separate exchange, settlement, deposit or withdrawal fee on these pages (fanduel.com, read 2 Oct 2026). | Official source |
| GameClub | Docs: most markets have no trading, deposit or withdrawal fees; crypto markets charge a taker fee peaking at 1.50% at 50% probability, funding maker rebates (https://guide.gameclub.com/trading/markdown). | Official source |
| Hermes Trade | Taker fee in basis points deducted at match; makers not charged at placement; current rate from GET /fee-rate (default not published) (https://docs.hermestrade.xyz/core-concepts/fees). | Official source |
| HypeMarket | ToS preview: 1% protocol fee per trade; creator-led markets may add a 0–2% creator fee disclosed before confirming (https://hypemarket-protocol.gitbook.io/hypemarket-protocol-docs/legal/terms-of-service). | Official source |
| Hyperliquid | The HIP-4 page still says “fees are currently zero for outcome markets for initial testing”, and builders earn builder fees on orders carrying their builder code. Hyperliquid’s Fees page adds that outcome trading “only charges fees when closing or settling, not when opening outcome positions” and pays no maker rebates; a market’s deployer can scale the fee from 0 to 10 times a base outcome rate that is not yet published. Perpetual-futures fees are a separate schedule (hyperliquid.gitbook.io, read 2 Oct 2026). | Official source |
| Kalshi | The general taker formula is 0.07 × multiplier × contracts × price × (1 − price), subject to schedule rounding. Maker fees use 0.0175 with a default multiplier of zero, but selected series charge maker fees. No settlement fee; funding charges depend on the payment method. | Official source |
| Levr Bet | Vault page shows a 0.00% vault deposit fee and protocol fee "WAIVED (0%)"; ToS says voided markets return collateral "less any fees already charged at position opening". Bettor fee rates not published. | Official source |
| Limitless Exchange | The published AMM rate is 0.40%, subject to market exceptions. Order-book taker rates vary with price and direction: buy fees are collected in outcome tokens and sell fees in USDC. A single maker/taker percentage cannot represent every market. | Official source |
| MagicMarkets | "Zero commission. No fees, no cuts"; nothing charged on deposits or withdrawals, though third-party onramp/network fees may apply (homepage FAQ). | Official source |
| Manifold Markets | Manifold trades in mana, its play-money currency, which “cannot be converted to cash”; every user starts with M1000 free and more mana can be bought (docs.manifold.markets/faq, read 2 Oct 2026). The FAQ mentions no per-trade fee. Creating a market costs mana, and “the entirety of the initial cost goes towards liquidity”; some market types cost more. Free daily loans are interest-free; margin loans for Plus, Pro and Premium members “accrue 0.03% interest per day”. | Official source |
| Meridian Predict | "Meridian Predict does not charge trading fees. You stake your collateral, the counterparty stakes theirs, and the winning side redeems the entire pool" (https://docs.meridian.xyz/trading/predictions/fees-and-collateral). | Official source |
| Myriad Markets | Order-book and AMM markets use different pricing. Order-book makers pay no trading fee; taker rates vary with price. AMM buy fees vary by market, and the application may add a gas charge. Read the market quote before comparing costs. | Official source |
| Novig | Novig's help centre says "only takers pay trading fees on Novig. The maker fee is $0" (support.novig.com/en/articles/16195057-fees-on-novig, read 28 Sep 2026). Pre-game straight trades carry no fee for maker or taker (app/web and API). Taker fees are 0.03 x P x (1-P) per contract on live straight trades, 0.06 x P x (1-P) on futures, and 0.10 x P x (1-P) on parlays (the parlay fee is built into the quoted price). At a 50c contract that works out to about 1.5%, 3% and 5% of the stake respectively. Our calculation: 0.03 x 0.25 = $0.0075 per 50c contract. The help centre's worked example is 100 live contracts at 50% = $0.75. Makers on live and futures markets can earn a rebate through the Maker Credit Program: "50% of the Live Taker Fee collected" and "70% of the Futures Taker Fee collected", starting 10 September 2026. Deposits by credit card, debit card or Apple Pay use 'standard pricing' with a 3% fee; bank transfers (Stripe, Aeropay) and stablecoins (Coinflow) use no-fee 'discount pricing' (support.novig.com/en/articles/15062817, read 28 Sep 2026). No withdrawal fee is stated anywhere we read. | Official source |
| OG | US (including New York), most markets including sports and politics: taker fee “0.07 × C × P × (1 − P)” and maker fee “0.0175 × C × P × (1 − P)”, where C is the number of contracts and P is the price. At 50¢ that is about 1.75¢ (taker) or 0.44¢ (maker) per contract. Crypto, FX, commodities and equity-index contracts cost a flat $0.02 per contract to open or close. Settlement fees are waived. Outside the US, all markets cost $0.02 per contract. OG charges nothing to deposit by ACH, wire, debit card, PayPal, linked bank account or Mesh crypto-to-cash. Your bank, card issuer or network may still charge. ACH and debit-card withdrawals are free. RTP instant withdrawals cost 1.5%. No single percentage is given for maker or taker fees because they vary with price. | Official source |
| Opinion | Opinion states that “fees apply to the taker only; makers are not charged”, and that “fees range from 0% to 1%”, highest near a 50% price: the rate is topic_rate × price × (1 − price), less any discounts, with a $0.25 minimum fee and a $5 minimum order. Makers receive 50% of the taker fee back as a rebate (“subject to change”). Opinion covers on-chain gas for trades, and withdrawals have a $5 minimum (docs.opinion.trade, read 2 Oct 2026). | Official source |
| Overtime | On top of oracle-fed odds "the AMM applies a protocol fee, currently set at 2%"; trading with $OVER as collateral gets a reduced margin (https://docs.overtime.io/learn-about-overtime/overtime-amm-and-liquidity-mechanics). | Official source |
| ParamX | "0.30% of a fill's value, paid only by the taker"; makers pay nothing; no ParamX deposit, withdrawal or gas fees (docs). | Official source |
| Pascal | Taker fee = size x price x (1 - price) x taker_fee_rate, default "taker_fee_rate": "0.020000" (2%); makers receive "maker_rebate_share": "0.250000" (25% of the taker fee). Configured per market (https://docs.pascal.trade). | Official source |
| Polymarket | Taker fee = shares × category rate × price × (1 − price). For 100 crypto shares at $0.50 with rate 0.07, the fee is $1.75 on a $50 purchase: 3.5% of purchase cost, not 1.75%. Rounding and any rebates must be considered separately. | Official source |
| Polymarket US | Taker fees follow a formula rather than a flat percentage: "Fee = Θ × C × p × (1 - p)", with a taker theta of 0.0695. The fee peaks at $1.74 per 100 contracts at a $0.50 price, which is about 3.5% of the $50 trade value, and falls toward zero near $0.01 or $0.99. Makers currently receive a rebate with a theta of -0.0125 (up to $0.31 per 100 contracts). Takers who traded $250k to $999,999 the previous month get 10% back, $1M to $9.99M gets 25%, and $10M+ gets 50%. Combos (parlays) carry a higher taker curve that adds a 0.06 × (1-p)^4 term. The schedule reads "Effective exchange-wide from 10 AM ET, Thursday October 1, 2026" (docs.polymarket.us/fees, read 5 Oct 2026). Changes are pending. From 7 Oct 2026 combo trades lose the maker rebate and the Table Tennis taker coefficient becomes 0.10, according to the same page. CFTC 40.6(a) filings dated 2 Oct 2026 attach a fee schedule marked "Effective October 19, 2026": the flat maker rebate becomes tiered, at Θ −0.0035, −0.0070 or −0.0104 for makers with at least $10M, $50M or $200M of prior-month maker volume and none below $10M, and the taker rebate becomes 3%, 5%, 10%, 15% or 30% of fees paid from $250k, $1M, $10M, $25M and $50M of prior-month taker volume. Withdrawals are described as free ("Withdraw your cash balance securely and for free"). No deposit fee is stated anywhere in the docs. | Official source |
| Precog Markets | "Buying outcome shares has no fee." Selling may incur a market-specific fee split between LPs, the market creator and the protocol; the amount is shown before confirming (https://learn.precog.markets/). | Official source |
| PRED | Docs page "Fees (Launching Soon)": taker-only fee, base rate 2.5% with Fee = 0.025 × shares × price × (1 − price); makers 0%, no fee on redemption (https://pred-1.gitbook.io/pred-docs/trading/fees-launching-soon). | Official source |
| PredictEX | Terms list notional trading fees, leverage activation fees, withdrawal and network fees etc. per a Fee Schedule; rates not published in the Terms. | Official source |
| Predict.fun | Makers pay no fee. The published taker formula uses the base rate × min(price, 1 − price) × shares, with an optional discount. The documented 1 USDT minimum is an order minimum, not a verified deposit minimum. | Official source |
| PredictIt | PredictIt charges 10% of profit on profitable share sales or settlement, using purchase order (FIFO) for partial sales. No profit fee applies to break-even or losing trades. Withdrawals cost 5%, with a 30-day hold after the initial deposit; the terms allow additional method-specific charges. These percentages use different bases and must not be added into a single 15% trading fee. | Official source |
| Probable | Probable states: “Only takers pay fees. Makers trade free.” Taker fees “range from 0.01% up to 1.75%, depending on market price”, highest at a 50% probability; the curve is published as a chart, not a formula. Probable covers gas for trade execution and settlement, splitting and merging carry no fee, and “there is no withdrawal fee charged by Probable” — network gas on deposits and withdrawals is the user’s (docs.probable.markets, read 2 Oct 2026). | Official source |
| Prophet Prediction Market | No separate commission; cost is the spread: "Prophet's spread is currently around twenty percent". Polygon gas is paid by Prophet; bridging fees apply to cross-chain deposits (https://docs.prophetmarket.ai/reference/fees-spread-and-gas). | Official source |
| ProphetX | Single-event (straight) trades: "All straight trades on site will be charged a 2% trading fee on net gains per market" (prophetx.co Trading Fees page, v1.2, updated 24 Sep 2026; also the help centre's Understanding Fees page). The CFTC self-certification words this as "2% of net proceeds ... calculated on a per-market basis upon settlement" (ProphetX LLC filing, 12 June 2026, extended 14 Aug 2026). The same filing sets a monthly make-volume rebate on fees paid: 0% up to $50k, then 20%, 40%, 60% and 80% marginal tiers above $7.5M. Parlay contracts: the fee is charged only to the taker, using F(p) = 0.014 x (1-p)/(0.19+p) + 0.004 per contract, with a $0.01 minimum. The help centre says "If your resting order is filled by an incoming order (a maker order), you are not charged a trade fee." The minimum deposit is $10 (help centre). Neither the operator's help centre nor its terms list a deposit or withdrawal fee, and the EdgeBoost deposit route is described as having "no fees". Terms 6.11: "Your access to Account funds will automatically expire in the event an Account becomes Dormant", where dormant means 60 days with no trading. | Official source |
| Rain | ToS fee structure on total market volume: 1.2% market creator, 1.2% liquidity providers, 0.1% resolver, 2.5% protocol (RAIN buyback and burn), "Total Standard Fees: 5.0% of Market volume", plus a $1 AI-oracle fee on public markets. Disputes require collateral of 0.1% of volume or $1,000, whichever is less. | Official source |
| Ratio | ToS: "We may charge fees ... including transaction fees on trades executed through the Services"; no rates published. | Official source |
| Seer | Seer’s documentation states no fee of its own for trading, creating, minting or redeeming. Outcome tokens “are traded on AMMs” — Swapr on Gnosis and Uniswap V3 on Ethereum, Base and Optimism — and each pool’s fee goes to its liquidity providers, at a tier set per pool; the confirmation screen shows the price and fee before a trade. An unstated Seer fee is not a verified zero (seer-3.gitbook.io, Seer’s docs, read 2 Oct 2026). | Official source |
| Space | Space runs an order book where “traders adding liquidity to the order book via limit orders (makers) pay 0 fees”; takers pay a fee set by the market’s probability. The buy fee falls from 2.00% at a 0% probability to 0.02% at 100%; the sell fee peaks at 1.00% at 50% and tapers to 0.02% at either end, and a position held to resolution pays no sell fee. Rates “may vary based on Market conditions”; fees are refunded if a market is voided. No deposit or withdrawal fee is stated (docs.into.space, read 2 Oct 2026). | Official source |
| STRATO Odds | "A flat 0.01 USDST network fee per transaction, and a 2% trading fee paid by whoever takes a resting order"; makers trade fee-free; no fee on payouts. | Official source |
| SX Bet | "SX Bet currently has no trading fees on single bets": taker 0%, maker 0%, parlays 5%, applied only to winning bets. Glide bridge withdrawals carry a 0.33% fee. | Official source |
| Trueo | Trueo trades YES/NO tokens in Uniswap pools and describes returns as “net of fees”, but publishes no trading-fee rate. The one published rate is for markets funded by proposal: “A 5% launch fee is charged only if the proposal successfully graduates.” Creators “earn creator fees”, at no stated rate; minting and redeeming (1 YES + 1 NO for 1 TYD) carry no stated fee (docs.trueo.com, read 2 Oct 2026). | Official source |
| TurboFlow | TurboFlow publishes no fee rate for its Prediction markets or Higher/Lower Event Contracts; Event Contracts pay a “Return Rate” that “is dynamically quoted based on real-time market conditions”, up to 200 USDT per duration. Its fee schedule covers perpetual futures only: Classic Perps charge 0.02%–0.08% per side by pair, and Turbo Perps charge no trading fee but take a profit share on winning trades (10% base on BTC). No deposit or withdrawal fee is stated (turboflow.gitbook.io, read 2 Oct 2026). | Official source |
| Underdog Predictions | Exchange fees on UDX follow a formula, not a flat percentage. The UDX Fee Schedule (Version 2.0, "Effective Friday, September 11, 2026") sets taker fees at "Fees = Round (0.07 x C x P x (1-P))" and maker fees at "Fees = Round (0.0175 x C x P x (1-P))", rounded to the nearest cent. At a 50-cent price that is $1.75 per 100 contracts for takers (3.5% of a $50 trade) and about $0.44 per 100 for makers, falling toward zero near 1 or 99 cents. Maker fees are charged only when a resting order executes, there are "no fees associated with canceling a resting order", and the ENTITYCOMBO combination product is excluded from maker fees. The FCM, UDM LLC d/b/a Underdog Predict, publishes its own fee schedule (effective February 12, 2026): "Commission: $0.01 per contract, per side", with exchange and regulatory fees passed through on top. UDM is a Kalshi Klear member, so this commission appears to apply to FCM-carried trades. The UDX rulebook says no FCM "may submit trades in Contracts for execution on behalf of its customers". Neither fee schedule lists a deposit or withdrawal fee. The UDX participant agreement mentions a possible "Inactive Account Fee" posted on the website, but the current fee schedule does not show one. | Official source |
| World | No protocol fee ("The Foundation does not currently charge fees"); users pay network fees on buys and sells, a refundable rent deposit on the first buy in a market, and a small deposit fee. Nothing is charged on payout (https://world.xyz/support/what-am-i-charged). | Official source |
| Worm | Worm’s documentation states no fee rates. Trading fees on user-created markets “are split equally between Worm and the market creator”, and creating a market has “no listing fee”. Leveraged positions pay a closing fee only if “you win” or “you are liquidated” — “there is no fee if you lose without being liquidated” (docs.worm.wtf, read 2 Oct 2026). Per-market rates appear in Worm’s API but not in its documentation, so they are not restated here. | Official source |
Only platforms with recorded fee evidence appear. Missing platforms are not assumed to be free. Browse all reviews.
These calculators are illustrative. Prices move, fee schedules change, and a filled order is not always the price you saw — check the platform before trading. Nothing here is financial advice.