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Prediction Market Promo Codes & Offers

A few platforms now attach bonus credit to a first trade, but the biggest exchanges compete on something more durable: what your money earns while it sits there, what a trade costs, and what a referral is worth. Every platform below is compared on exactly that.

Polymarket
4.5

The world's largest prediction market, with free limit orders

RecommendedVerified
  • Deepest liquidity anywhere: about $7B traded every month
  • Our highest-rated platform: 4.5 out of 5
  • Free limit orders, plus 20-50% maker rebates on some markets
  • Thousands of markets: politics, sports, crypto, economy, culture
  • Industry-leading accuracy: a Brier score around 0.09
  • Settles in USDC, so every trade is verifiable on-chain

Polymarket is where the biggest questions get priced first. If you open one prediction market account, make it this one: the deepest order books, the widest catalogue, and the prices the rest of the industry benchmarks against. Signing up through our link supports PredictReport at no cost to you.

No code neededSign up
Kalshi
4.3

Earn around 4% APY on idle cash while you trade

Recommended
  • About 4% APY paid on uninvested cash
  • CFTC-regulated designated contract market
  • Deposit and settle in US dollars, no crypto wallet needed
  • Available in 40+ US states
No code neededSign up
Our top pick · rated 4.5 / 5

Why Polymarket is the first account to open

Polymarket is the largest prediction market in the world, and together with Kalshi it handles about 97.5% of everything the category trades. If you open one prediction market account, this is the one we would open first.

01

The deepest markets anywhere

Around $7 billion traded every month. Its 2028 Democratic nomination market alone has traded more than $1.2 billion — more than most platforms handle in total. Deep books mean you get the price you see.

02

Prices the whole industry benchmarks

Polymarket's markets have posted a Brier score around 0.09, roughly 94% accuracy. When newsrooms quote prediction market odds, these are usually the odds they quote. Our guide to prediction market accuracy explains the number.

03

Free to post, cheap to take

Limit orders that rest on the book pay no fee, and some markets pay makers a 20–50% rebate on top. Taker fees run 0.75–1.80% depending on the category — see our Polymarket fees breakdown.

04

A market on everything

Thousands of live markets across elections, sports, crypto, the economy and culture, with new ones listed as news breaks. If a question is being argued about, there is usually a Polymarket price on it.

05

Transparent by design

Every trade settles in USDC on Polygon, so positions, volume and payouts can be verified on-chain rather than taken on trust — which is how tools like Dune Analytics track it.

06

Serious backing

ICE, the owner of the New York Stock Exchange, has committed up to $2 billion, and Polymarket bought QCEX, a CFTC-licensed exchange, to serve US traders. Our safety assessment covers what that means for you.

Open a Polymarket accountRead the full review →
#ad · Affiliate link · 18+ · Availability varies by location

What a prediction market offer actually is

Sportsbooks and casinos buy sign-ups with free money — a matched deposit, a no-deposit bonus, a free bet. The largest prediction markets mostly do not, because they are exchanges rather than a house taking the other side of your bet. That is changing at the edges: the sportsbook operators that launched prediction products brought their promotional playbook with them, and now credit a first trade. Treat that credit like a sportsbook bonus — usually non-withdrawable, and worth something only once it is traded.

What you get instead is structural. Kalshi pays around 4% APY on cash sitting in your account, which over a year of holding positions is worth far more than any one-off credit. Polymarket rebates 20% to 50% to makers on some markets, so posting liquidity costs less than taking it. Newer venues subsidise trading outright with zero fees while they build volume. Referral codes exist on most platforms and usually credit both sides after your first trades.

How to choose between them

Work out which of the three costs actually applies to you. If you hold positions for weeks, interest on idle cash dominates everything. If you trade often, the fee schedule matters more than any bonus. If you are opening one account to try the thing, pick on deposit friction — dollars and a bank link, or USDC and a wallet.

Our Polymarket vs Kalshi comparison works through those three costs with numbers, and the best prediction market apps ranking covers the wider field. Once you have an account, our live odds comparison shows which venue is currently cheaper on each market.

Frequently asked questions

Do prediction markets have sign-up bonuses?

Some do. Sportsbook-run platforms such as DraftKings Predictions, FanDuel Predicts and Fanatics Markets attach promotional credit to a first trade, and ProphetX and Novig run deposit-and-trade offers. The largest venues compete differently — Kalshi pays interest on idle cash, Polymarket makes limit orders free and pays maker rebates. Bonus credit is usually non-withdrawable and has to be traded first.

Which prediction market pays interest on your balance?

Kalshi pays roughly 4% APY on idle cash. Polymarket pays nothing on USDC balances but runs maker rebates of 20–50% on some markets, and Predict.fun pays yield on posted collateral. Details in our Kalshi review.

Are prediction market promo codes worth using?

A referral code usually credits both sides a small amount after your first trades, so there is no reason not to use one. It will not decide which platform suits you — fees, depth and settlement currency matter far more, which is what our platform rankings weigh.

Do I need to deposit to open an account?

No. All of these let you open an account and browse before funding it. Regulated venues require identity verification before trading; the crypto-settled ones need a funded wallet — see how to deposit on Polymarket.

Is signing up to a prediction market legal in the US?

Kalshi is a CFTC-regulated designated contract market; Polymarket acquired a CFTC-licensed exchange to serve US traders. Several states have challenged event contracts, so availability varies — the current position is in our legal guide.

PredictReport earns a commission when you open an account through links on this page. It does not change what you pay, and it does not decide the order — that is set editorially and every platform here is reviewed in full under Ecosystem. Trading involves risk of loss. 18+.