Polymarket US vs XO Market
Same lines, side by side: fee at 50¢, custody, KYC, excluded countries, resolution and volume, from official pages and DefiLlama.
See the 15 differences
| Line | Polymarket US | XO Market |
|---|---|---|
| Type | VenueLists, matches and settles its own markets | VenueLists, matches and settles its own markets |
| Taker fee | 3.48% at 50¢Since 19 October 2026, takers pay 0.0695 × contracts × p × (1 − p): 100 contracts at 50¢ cost $1.74. Table tennis uses 0.10. Makers pay nothing and earn a rebate from $10M of monthly maker volume; takers get 3% to 30% back from $250,000 of monthly volume. | Edge3% at 50¢Takers pay shares × base rate × p × (1 − p). The base rate is 6% on Pulse rounds, so 100 contracts at 50¢ cost $1.50; other markets set their own. Makers pay nothing and receive 35% of the taker fee on eligible markets. Creating a market costs $1 plus a seed order of at least $10. |
| 30-day volume | Edge$3.14B | $66M |
| New-user perk | Edge$25 trading credit after signing up with a referral code and depositing at least $10 | None documented |
| Custody | Custodial dollar account | EdgeSelf-custody smart wallet |
| Identity check (KYC) | KYC requiredEvery account is verified: name, address, Social Security number and a photo ID, with a selfie when needed. | No KYCNo identity check to open an account or trade; contest and referral payouts may require verification. |
| Excluded countries | Open only to residents of United StatesOpen to US residents only, and trading is not available in Nevada, although its App Store page claims all 50 states. | 8Its terms exclude the US, the UK, France, Singapore and Ontario, plus Cuba, Iran, North Korea and Syria. No date is shown on the page. |
| Resolution | Decided by the exchangeMarkets settle under the exchange's rulebook. Polymarket US publishes rule clarifications and can cancel resting orders when it clarifies a market. | AI panel, human appealMODRA, a panel of independent AI agents, drafts the rules and proposes outcomes; when agents disagree or a trader challenges, a court of staked human jurors decides. XO can also void a market. |
| Settles on | Polymarket Clearing | XO rollup (Celestia DA) |
| Collateral | USD | USDC |
| Operator | QCX LLC (Polymarket US)CFTC (DCM, DCO) | Not documented |
| Token | No token | No token |
| Where it runs | Web, iOS, Android | Web |
| Chains | — | — |
| Documented features | 5 of 10 | Edge6 of 10 |
| Order book | Yes | Yes |
| Anyone can create a market | No | Yes |
| Combos / parlays | Yes | Yes |
| Maker rebates | Yes | Yes |
| Yield on collateral | Not documented | Not documented |
| Trading API | Yes | Yes |
| Mobile app | Yes | Not documented |
| Telegram bot | Not documented | Not documented |
| Own token | Not documented | No |
| Points program | Not documented | Yes |
Which one should you pick?
Pick Polymarket US if
You live in the US outside Nevada and want Polymarket in a regulated app with dollar deposits.
Polymarket's regulated twin for Americans: same brand, but a separate CFTC-regulated exchange with dollar accounts, identity checks and its own fee formula. Since 19 October 2026 its taker fee is almost exactly Kalshi's, and it serves no one outside the US.
Read the Polymarket US reviewpolymarket.us
Pick XO Market if
You want to create your own markets and earn 20% of their lifetime trading fees.
The most open venue in the series: anyone can create a market for $1 plus a $10 seed, and a panel of AI agents resolves it, with staked human jurors on appeal. No company is named behind it, and its taker fee depends on the market: 3% at 50¢ on Pulse rounds.
Read the XO Market reviewxo.market
