Polymarket explained: sign-up, trading and how prediction markets work

Polymarket is the world's biggest prediction market, and it is not a casino. You trade shares in the outcome of real events against other users, prices track what the crowd believes, and there is no house edge in the casino sense. This guide covers who it suits, how to open and fund an account from Nigeria, how markets resolve, the regulatory history and where the real risks sit.

By CasinoTrust Editorial TeamUpdated 31 August 202611 min readFact-checked against the Ranking Protocol

Polymarket sits at the top of our prediction market ranking. It belongs on a gambling review site because people put money on uncertain outcomes there, but the machinery works far more like an exchange than a betting shop, and the risks are a different shape entirely. Grasping that difference is the most useful thing this page can hand you.

Polymarket is a prediction market, not a casino

In a casino or with a bookmaker you play against the house, and the house sets prices with its margin baked in. On Polymarket you trade with other users. Every market poses a yes/no question — 'Will X win the election?', 'Will the Fed cut rates in September?' — and issues Yes and No shares that pay $1 if correct and $0 if not. A Yes share changing hands at 64¢ means the market puts the chance at 64%. Buy at 64¢ and you collect $1 if it happens; if it does not, the share expires worthless. You can sell at any point before resolution at whatever the price is then.

For sport, that means the price on a liquid fixture is often better than what a bookmaker will give you, and worse on anything obscure — a Champions League final is deeply traded, a lower-division fixture may have no book at all. Set the two against each other in our sports betting reviews and the prediction market comparison.

Who Polymarket suits

• Traders and punters who want a price with no bookmaker margin on it, plus the option to get out early
• People with a genuine information or analytical edge on politics, macro, crypto or sport
• Crypto users comfortable holding USDC on Polygon and running their own wallet
• Not for: anyone after casino games, bonuses, a naira balance, or a regulator standing behind the global platform

How to open a Polymarket account step by step

1. 1

   Create the account

   Sign up with an email — a wallet is generated for you — or connect an existing one such as MetaMask, Coinbase Wallet or WalletConnect. There is no promo code, so nothing to miss at this stage. Pick a username carefully: your trading activity is public on-chain and shows up on leaderboards.

2. 2

   Understand the KYC policy

   The global Polymarket platform asks for no identity documents to trade; access is gated by geography rather than paperwork, so check availability from Nigeria before you commit funds. Polymarket US, the CFTC-regulated venue launched after the 2025 QCEX acquisition, requires full KYC like any US derivatives exchange. Residents of restricted countries (historically the US for the global site, France and others) are blocked, and using a VPN breaches the terms.

3. 3

   Fund with USDC

   Load your wallet with USDC on Polygon. You can send USDC from an exchange directly on Polygon, bridge in from Ethereum or another chain through the built-in deposit flow, or buy with a card through a third-party on-ramp, which charges a fee. From Nigeria the usual route is buying USDT or USDC through a P2P exchange with a naira bank transfer, then withdrawing on the Polygon network — always check the network before you press send. Roughly $1 is enough for a first trade, and there is no fiat balance of any kind.

4. 4

   Place your first trade

   Open a market, choose Yes or No, then either take the market price or set a limit order where you want it. Your worst case is losing what you spent; your best case is the number of shares times $1, minus what they cost you. Begin in a liquid market where the spread is a cent or two rather than a novelty market with nobody on the other side.

5. 5

   Withdraw

   Winning positions settle to USDC automatically once the market resolves, and open positions can be sold whenever you like. Withdraw USDC to any Polygon address or bridge it out — settlement is on-chain and normally takes minutes. Polygon network fees are trivial. To get back to naira, most traders sell the stablecoin P2P and receive a bank transfer.

Markets on Polymarket

Read the full resolution criteria every single time before you trade. The title of a market is only a summary; the description states exactly which source and which date settle it. Most of the expensive mistakes on prediction markets come from trading the headline instead of the rules.

Bonuses and promotions

Polymarket runs no casino-style bonuses at all. There is no deposit match, no free bets and no wagering to clear, which is why its bonus score is the lowest on this site. What exists instead is structural: liquidity rewards for leaving resting limit orders near the mid-price on designated markets, plus the occasional referral or community programme. If something advertises a 'Polymarket bonus code' — and they circulate on social media here — treat it as an affiliate scheme or an outright scam, not an official promotion.

Payments, fees and settlement

Trading has historically carried no platform fee on most markets, with your real cost showing up as the bid-ask spread and slippage; check the current fee schedule on the site, because fees have since been introduced on some market types. Because settlement happens on-chain there is no withdrawal queue, no review period and no maximum — a real advantage over casinos, and one we quantify in the prediction market comparison. Your genuine cost from Nigeria is the P2P spread on the way in and out.

Safety and regulation: the honest position

Polymarket's regulatory story is the single most important thing to understand before you use it. Note first that it is not licensed by the National Lottery Regulatory Commission or any state lotteries board — no Nigerian authority stands behind it.

• 2022 CFTC settlement: in January 2022 the US Commodity Futures Trading Commission found that Polymarket had offered off-exchange event-based binary options without registration. Polymarket paid a $1.4 million civil penalty, wound down the non-compliant markets and agreed to block US users from the global platform.
• 2024–2025 investigations: after the 2024 US election, federal authorities looked into whether US residents were still trading on the platform, and the founder's residence was searched in November 2024. The Department of Justice and CFTC closed their inquiries in July 2025 without bringing charges.
• 2025 US return: Polymarket bought QCEX, a CFTC-licensed designated contract market and clearing house, in mid-2025 and re-entered the US through a regulated entity, Polymarket US, later that year. Trading there sits under CFTC oversight with full KYC.
• Institutional backing: in late 2025 Intercontinental Exchange, parent of the New York Stock Exchange, announced a major investment in Polymarket — a strong signal about staying power, and no guarantee whatsoever about any individual trade.
• Global platform status: outside Polymarket US, the venue is an unregulated on-chain marketplace. No regulator guarantees your funds; your protection is the smart-contract code and the resolution process.
• Resolution risk: markets settle through published rules and the UMA optimistic oracle, where token holders vote on disputed outcomes. Several high-profile disputes have shown that a market can resolve in a way that shocks traders who read the title but skipped the rules, and that large oracle voters carry weight. That is what counterparty risk looks like here.

Our trust score of 8.2 weighs genuine transparency — every trade and every resolution is on-chain and auditable — against the absence of regulatory protection on the global platform and a non-trivial oracle risk. Our scoring approach is in the Ranking Protocol, and how we handle non-casino platforms is set out in the Editorial Policy.

Mobile and apps

Polymarket ships native iOS and Android apps alongside a responsive web app. The apps carry the full product: market discovery, order placement, portfolio and deposits. Wallet-connect flows behave better in the browser, while email-based accounts are smoother in the apps. Price alerts and push notifications on resolution earn their keep if you hold positions across many markets — and they save you refreshing the portfolio on data all day.

Customer support

There is no live chat and no phone line. Support runs on an email ticket system, a help centre and a large Discord community where staff and moderators answer questions. For a deposit or withdrawal problem, supply the transaction hash; for a resolution question, read the market rules and the oracle dispute thread before you write, because support cannot overturn a settled outcome. Our support score of 7.0 reflects service that is competent but strictly asynchronous.

Polymarket vs bet365 vs Stake

Take bet365 if the strongest regulatory protection and ordinary banking matter most, or Stake if you want a crypto sportsbook with casino games alongside — access from Nigeria varies for both, so check first. Use Polymarket when you would rather trade the probability than accept a bookmaker's price, and when being able to exit a position early is worth something to you. Full comparisons: sports betting comparison and prediction markets.