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The how-to library

Every page on the site that answers one question in full: fees, withdrawals, offers and tax, venue by venue. Each states its verdict first, cites the venue’s own documents, and carries the date it was checked.

All 85

Kalshi

Polymarket

Novig

Robinhood

Zohran Mamdani markets on Polymarket: every open question

Every open Polymarket market about New York City Mayor Zohran Mamdani, with its price and closing date, read from Polymarket’s public API.

Read more →REFERENCE

Kalshi commercials: the AI ad, the celebrity spots and the pushback

The AI-made NBA Finals ad, the 2026 spots with Giannis, Chalamet, J Balvin and Marshawn Lynch, the NFL ad ban, and the regulators who objected, each sourced.

Read more →REFERENCE

Prediction market arbitrage: Kalshi vs Polymarket gaps after fees

The live price gaps between Kalshi and Polymarket on the same questions, what Kalshi’s fee takes from each, where the two venues’ rules differ, and the trading rules that apply.

Read more →REFERENCE

Polymarket invite codes and referrals

Polymarket has no invite codes. It has a referral programme with a $10,000 threshold, a 10% share of net fees, and two caps that end it early.

Read more →3 MIN

2026 midterm odds: House and Senate on Kalshi and Polymarket

Party control of the House and Senate after the 2026 midterms, priced on Kalshi and Polymarket side by side, with the rule each market settles on.

Read more →REFERENCE

How to invest in Polymarket: US app or international, step by step

Polymarket US or polymarket.com, how to fund each, the deposit limits and minimums, how an order and a payout work, and how markets resolve, each from Polymarket’s own pages.

Read more →REFERENCE

Kalshi careers: 46 open roles, where they are, how to apply

Kalshi's open roles by team and office, read from its own job board, with where to apply. 46 openings when we checked.

Read more →REFERENCE

Kalshi's taker and maker fees, taken from its published fee schedule and its own API rather than its help centre, including the series where makers do pay.

Read more →6 MIN

Novig promo codes and referral bonus

Novig's referral bonus gives your friend $50 and you five $10 credits, capped at five referrals. Your credits expire in 7 days and only work on trades priced from $0.01 to $0.60.

Read more →9 MIN

Super Bowl odds on Kalshi and Polymarket, team by team

The pro football championship priced on Kalshi and Polymarket for every team, side by side, with the rule each market settles on.

Read more →REFERENCE

Kalshi withdrawals

Kalshi withdrawal methods, timings and fees from its own documentation, plus what users actually report, including the compliance review that explains most failures.

Read more →4 MIN

Fed decision contracts: what they resolve on

Kalshi's Fed markets settle on the upper bound of the target range as the Federal Reserve publishes it, not on the dot plot. The exact rule, the clock, and how Polymarket's version differs.

Read more →REFERENCE

NFL prediction markets: Kalshi and Polymarket game odds

The favourite and its price on Kalshi and Polymarket for the next NFL games, read from both venues' public APIs at 11:38 UTC on 11 October 2026, with the rule each game market settles on.

Read more →REFERENCE

Kalshi sign-up bonus and referral codes

Kalshi runs a real referral code programme but publishes no bonus amount, no cap and no trading requirement, every site quoting a figure is guessing. Here is what the terms do say.

Read more →7 MIN

Prediction market stocks: the listed companies behind Kalshi and Polymarket

Kalshi and Polymarket are private. The listed companies that run, route to or own stakes in prediction markets: Robinhood, ICE, CME, Interactive Brokers, DraftKings, Flutter and Coinbase.

Read more →REFERENCE

Polymarket fees

Polymarket's taker fees by category, checked against its own published tables, including a live 0.03 tier that appears in no published table.

Read more →5 MIN

PredictIt markets: all 201 open markets and their favourites

All 201 markets open on PredictIt, each with its leading contract and last traded price, read from PredictIt’s own market data feed.

Read more →REFERENCE

DEMOCRATIC NOMINEE 2028

2028 Democratic nominee odds on Kalshi and Polymarket

The 2028 Democratic presidential nominee priced on Kalshi and Polymarket, candidate by candidate, with the rule each market settles on.

Read more →REFERENCE

Polymarket Discord, status pages and official channels

The official Polymarket Discord links for the international site and Polymarket US, the two status pages, the help centre and Polymarket’s social accounts, from its own pages.

Read more →REFERENCE

2026 Senate race odds: every state on Kalshi and Polymarket

The favourite in each 2026 Senate race and its price on Kalshi and Polymarket, read from both venues' APIs, with the rule each market settles on.

Read more →REFERENCE

What is Novig? The sports prediction market, its odds, states and funding

Novig is a CFTC-designated sports prediction market. How its odds and fees work, the three states it excludes, the 21+ rule, its funding, and Ohio’s October 2026 letter.

Read more →REFERENCE

Betfair referral codes, what exists and what doesn't

Betfair's help centre documents a promo code for bingo, bonuses on Exchange Games and a commercial affiliate scheme. What it does not appear to run is a refer-a-friend code for the Betfair Exchange itself.

Read more →4 MIN

Betfair login, password reset, verification and closing your account

How to log in to Betfair, reset a password or username, what identity documents it accepts and how long checks take, and how to close an account, from Betfair’s support pages.

Read more →REFERENCE

What tax forms prediction markets issue

Kalshi, Novig and PredictIt all issue a 1099, and all three report a different quantity. One reports net redemptions, one reports net profit, and Kalshi's four forms don't cover your trading gains at all.

Read more →6 MIN

US recession odds on Kalshi and Polymarket, and why they differ

Kalshi and Polymarket both price a US recession in 2026, on different rules. The prices side by side and each rule quoted.

Read more →REFERENCE

Betfair Exchange explained: back, lay, commission and US access

Betfair matches bettors against each other. Back and lay bets, how matching and commission work, who owns it, and why US residents cannot use it, from Betfair’s own pages.

Read more →REFERENCE

Election prediction markets: midterms, 2028 and the odds now

The election markets Kalshi and Polymarket list now, from the 2026 midterms to the 2028 nominations, each with prices read from the venue and the rule it settles on.

Read more →REFERENCE

Polymarket withdrawal time and fees

Polymarket's own bridge API quotes a checkout time and a full fee breakdown before you withdraw, and its docs name the exact liquidity problem behind most stuck withdrawals.

Read more →5 MIN

Prediction markets vs sports betting: regulator, pricing, age and tax

Who regulates each, who takes the other side of your trade, how each is priced, the 18 vs 21 age gap and the tax forms, from the CFTC, state regulators and the venues.

Read more →REFERENCE

Sporttrade promo codes, what happened to Sporttrade

Sporttrade closed its sportsbook in May 2026 and its homepage now says it is re-entering the market soon. It filed CFTC exchange applications on 27 January 2026, and both are still pending, checked against the CFTC's own register.

Read more →5 MIN

Betfair API and bots: keys, the GBP 499 fee, limits and rules

Betfair’s Exchange API: the free delayed key, the GBP 499 live key, the bot login, rate and data limits, and what the terms say about bots and commercial use.

Read more →REFERENCE

2026 Governor race odds: every state on Kalshi and Polymarket

The favourite in each 2026 governor race and its price on Kalshi and Polymarket, read from both venues' APIs, with the rule each market settles on.

Read more →REFERENCE

Bitcoin price contracts: which index, which second

Kalshi settles Bitcoin markets on a 60-second average of the CF Benchmarks BRTI; Polymarket uses a single Binance candle close. Why the same question can resolve differently, quoted from each venue's rules.

Read more →REFERENCE

What is ForecastEx? Interactive Brokers’ forecast contracts explained

ForecastEx is the CFTC-registered exchange behind Interactive Brokers’ forecast contracts: $1 payout, a $0.01 exchange fee, and an interest coupon. Each point quoted.

Read more →REFERENCE

Novig withdrawal time and cash out

Novig has no playthrough requirement and a $10 minimum, and delays come from two documented causes. Its Early Payout credits your guaranteed minimum instantly, which is not the same as locking in a profit.

Read more →4 MIN

Betfair Exchange commission

Betfair charges commission on net winnings, so a losing market costs nothing. Which rate applies turns on whether you are opted into My Betfair Rewards, and there are three further charges above the commission.

Read more →7 MIN

PredictIt fees, payouts and promo codes

PredictIt takes 10% of profit on winning sales and 3% on credit card deposits, with no fee on standard withdrawals. The cap is $3,500, not the $850 most guides quote. No promo codes.

Read more →8 MIN

How does PredictIt work? Shares, limits, fees and who runs it

PredictIt shares price from 1 to 99 cents and pay $1. The $3,500 limit, the 10% fee on profit, the 2026 fee changes and the no-action letter it runs under, each quoted.

Read more →REFERENCE

What is Sporttrade? The exchange, its closure and its CFTC bid

Sporttrade ran a sports betting exchange in five states, ceased wagering on 25 May 2026, and has CFTC exchange and clearing applications pending. Each point quoted.

Read more →REFERENCE

Robinhood event contract fees

Robinhood's commission is capped at a cent per contract, which flattens its probability-weighted curve across most of the price range, and Gold saves you nothing between 30¢ and 70¢.

Read more →7 MIN

Myriad prediction market: how it works, its crypto, and US access

Myriad is a crypto prediction market on BNB Smart Chain run from the Cayman Islands. How it works, what it charges, whether it has a token, and why US users are barred.

Read more →REFERENCE

NBA championship odds on Kalshi and Polymarket

The next NBA champion priced on Kalshi and Polymarket for every team, side by side, with the rule each market settles on.

Read more →REFERENCE

Smarkets commission, COMMFREE bonus and withdrawals

Smarkets charges 2% on net market winnings, so a losing market costs nothing. Its COMMFREE welcome code gives 60 days at 0%, measured from settlement, not from when you place the bet.

Read more →5 MIN

Betfair withdrawal times

Instant Bank Transfer lands immediately, eligible cards take 1 to 4 hours, everything else is 2 to 5 working days, and Betfair asks you to wait the full five before contacting it.

Read more →3 MIN

PredictIt login, verification, support and withdrawals

Where to log in to PredictIt, how to reset a password, how to reach support (no phone line), who verifies your identity, and the 30-day hold on withdrawals.

Read more →REFERENCE

PredictIt API: the free market data feed and its terms

PredictIt’s free market data feed: the two endpoints, the 60-second refresh, the XML it returns, and the non-commercial licence, quoted from PredictIt.

Read more →REFERENCE

Manifold Markets: play money, crypto, GitHub and API explained

Manifold is a play-money prediction market. Whether mana is crypto or cash, how sweepcash ended, the MIT-licensed GitHub repo and the API, from Manifold’s own pages.

Read more →REFERENCE

How does Smarkets work? Exchange, 2% commission, licences, US plans

Smarkets is a UK betting exchange with a 2% commission on net profit. How it works, its licences, who it bars, and the CFTC applications it filed in 2026 for the US.

Read more →REFERENCE

Smarkets login, password reset, support and verification

How to log in to Smarkets, reset a password, reach support, and how verification works, from Smarkets’ help pages. Where its own pages disagree, both are shown.

Read more →REFERENCE

Is Limitless legit? The Base prediction market, its terms and token

Limitless is a crypto prediction market on Base. Who operates it, why US users are barred, its pending CFTC application, the audit gap, and the LMTS token, from its own docs.

Read more →REFERENCE

What is Metaculus? Forecasting platform, not a prediction market

Metaculus aggregates probability forecasts rather than trading shares. How it works, its scale, and what its API gives an ordinary account, quoted from Metaculus.

Read more →REFERENCE

Railbird Exchange: what DraftKings paid, from its SEC filings

Railbird is the CFTC-designated exchange DraftKings bought in October 2025. The price from DraftKings’ 10-K and 10-Q, the $200 million performance cap, and what it is for.

Read more →REFERENCE

Augur in 2026: the wallet you need, REP after the fork, and its status

Augur is an Ethereum prediction market protocol with no live trading app. The current REP token and its contract, the 2026 fork, which wallet to use, and the scam warning.

Read more →REFERENCE

Is Kalshi legal in the US? State by state

Where Kalshi accepts residents, where it restricts sports contracts, and every state action against it, each from a quoted source. Checked 7 OCT 2026.

Read more →REFERENCE

Is Polymarket legal in the US? State by state

Where Polymarket accepts residents, where it restricts sports contracts, and every state action against it, each from a quoted source. Checked 7 OCT 2026.

Read more →REFERENCE

Is Novig legal in the US? State by state

Where Novig accepts residents, where it restricts sports contracts, and every state action against it, each from a quoted source. Checked 7 OCT 2026.

Read more →REFERENCE

Is Robinhood legal in the US? State by state

Where Robinhood accepts residents, where it restricts sports contracts, and every state action against it, each from a quoted source. Checked 7 OCT 2026.

Read more →REFERENCE

Kalshi review: fees, payouts and the offer, checked

Kalshi against Polymarket and Novig on the numbers that matter: the taker fee on a $50 position, withdrawal speed and fees, and a referral bonus Kalshi does not publish.

Read more →REFERENCE

Novig review: fees, payouts and the offer, checked

Novig against Kalshi and Polymarket: free pre-game trades, 0.03 live and 0.10 on parlays, a $10 minimum withdrawal, and the only referral offer published in numbers.

Read more →REFERENCE

PredictIt review: fees, limits and payouts, checked

PredictIt takes 10% of profit on a winning sale; standard withdrawals are now free and card deposits cost 3%. How that compares with the fee at 50 cents on Kalshi and Polymarket, from each venue’s own documents.

Read more →REFERENCE

Smarkets review: commission, COMMFREE and withdrawals

Smarkets charges 2% of net winnings and its COMMFREE code runs 60 days from settlement. Compared with Betfair and Polymarket on fees, payouts and offers.

Read more →REFERENCE

Betfair Exchange alternatives: Smarkets, Polymarket and Kalshi

The exchanges a Betfair user can compare it with, on commission, payout speed and offers, each from the venue’s own documents. Check which serve your country.

Read more →REFERENCE

Polymarket alternatives: Kalshi, Novig and Robinhood

The regulated alternatives to Polymarket in the US, compared on fees at 50¢, withdrawal speed and sign-up terms, each from the venue’s own documents.

Read more →REFERENCE

Kalshi API: hosts, auth, rate limits

The Kalshi Trade API: the production host, Ed25519 request signing, token-bucket rate limits from 200 reads a second, and the public endpoints that need no key.

Read more →REFERENCE

Polymarket API: Gamma, CLOB and auth

Polymarket's APIs: the public Gamma market API, the CLOB with EIP-712 and HMAC signing, rate limits per IP, and the separate Polymarket US API.

Read more →REFERENCE

Can you parlay on Kalshi? Combos, fees and the maths

Kalshi combos are their own markets, priced by request for quote, with a maker fee at half the taker rate. What a three-leg combo costs at 62 cents a leg, worked through.

Read more →REFERENCE

Can you do parlays on Polymarket? Combos, fees and limits

Polymarket combos: sports only on the international site, 2 to 10 legs on Polymarket US, and a combo fee formula of its own. The cost of a three-leg combo, worked through.

Read more →REFERENCE

Novig parlays: how they are priced and what they cost

Novig parlays carry a 0.10 coefficient against 0.03 on a live single, built into the quoted price. The cost of a three-leg parlay at 62 cents a leg, worked through.

Read more →REFERENCE

Prediction market parlays: Kalshi, Polymarket, Novig and Robinhood

How each regulated venue sells parlays and combos, what each charges on the combined price, and why a combo always pays less than multiplying the legs.

Read more →REFERENCE

Kalshi stock: is Kalshi publicly traded?

Kalshi is privately held and has no ticker. Its last announced round, who owns it, and the only indirect route retail investors have.

Read more →REFERENCE

Polymarket stock: can you buy shares?

Polymarket is private and has no ticker. Its last confirmed valuation, the ICE investment, and the funds that hold it indirectly.

Read more →REFERENCE

Kalshi account help: verification and support

How Kalshi verifies you, the minimum age, and how to reach its support team, from Kalshi's own help centre.

Read more →REFERENCE

Polymarket account help: verification and support

How Polymarket verifies you, the minimum age, and how to reach its support team, from Polymarket's own help centre.

Read more →REFERENCE

Novig account help: verification and support

How Novig verifies you, the minimum age, and how to reach its support team, from Novig's own help centre.

Read more →REFERENCE

Robinhood account help: verification and support

How Robinhood verifies you, the minimum age, and how to reach its support team, from Robinhood's own help centre.

Read more →REFERENCE

PredictIt login, verification, support and withdrawals

Where to log in to PredictIt, how to reset a password, how to reach support (no phone line), who verifies your identity, and the 30-day hold on withdrawals.

Read more →REFERENCE

PredictIt API: the free market data feed and its terms

PredictIt’s free market data feed: the two endpoints, the 60-second refresh, the XML it returns, and the non-commercial licence, quoted from PredictIt.

Read more →REFERENCE

Betfair login, password reset, verification and closing your account

How to log in to Betfair, reset a password or username, what identity documents it accepts and how long checks take, and how to close an account, from Betfair’s support pages.

Read more →REFERENCE

Betfair API and bots: keys, the GBP 499 fee, limits and rules

Betfair’s Exchange API: the free delayed key, the GBP 499 live key, the bot login, rate and data limits, and what the terms say about bots and commercial use.

Read more →REFERENCE

Smarkets login, password reset, support and verification

How to log in to Smarkets, reset a password, reach support, and how verification works, from Smarkets’ help pages. Where its own pages disagree, both are shown.

Read more →REFERENCE

Smarkets API: access, the GBP 150 fee, limits and rules

Smarkets’ HTTP trading API: how to apply, the GBP 150 setup fee, the rate limit, authentication, and the rules on data use, from Smarkets’ docs and help pages.

Read more →REFERENCE

CPI contracts: headline, core and revisions

Kalshi's CPI markets settle on the seasonally adjusted one-month change in headline CPI-U, to one decimal, as first published. Core is a separate series, and later BLS revisions are ignored.

Read more →REFERENCE

PRESIDENTIAL ELECTION 2028

2028 presidential election odds on Polymarket

The 2028 US presidential election winner priced on Polymarket, candidate by candidate, with the rule the market settles on.

Read more →REFERENCE

Kalshi leaderboard: what it ranks and who appears on it

Kalshi’s leaderboard ranks verified traders by profit, volume and predictions. Who can see it, and why you are not on it unless you opt in.

Read more →REFERENCE

Smarkets API: access, the GBP 150 fee, limits and rules

Smarkets’ HTTP trading API: how to apply, the GBP 150 setup fee, the rate limit, authentication, and the rules on data use, from Smarkets’ docs and help pages.

Read more →REFERENCE

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How we write these. The verdict comes first, every figure cites the venue’s own document, and a figure we cannot currently prove is withheld rather than shown stale.

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How every guide is laid out

The same shape on every page, so you always know where the answer is.

1

The answer, first

The opening paragraph carries the verdict before any detail.

The top of our Kalshi fees guide: the answer in the opening paragraph, captured 8 OCT 2026 — Our guide: Kalshi fees · 8 OCT 2026

2

Then: what usually goes wrong

From the venue’s own help pages and from dated user reports, each labelled as such.

Screenshot of Kalshi's Bank Withdrawals help page, the kind of source each guide quotes, captured 8 OCT 2026 — help.kalshi.com · 8 OCT 2026

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