Learn to trade prediction markets
Guides, stats, and reality checks on copying whales across Polymarket and Kalshi. Every data point on these pages comes from our own resolved-trade tape, no fabricated case studies.
Build a bot from market activity.
Start with Sports Whales to focus on sports activity. Choose Longshot Hunters to explore lower entry prices. Adjust the signal to your idea and test it at your own size. Rivo keeps the research and the running bot together.
Ask Claude or ChatGPT to find you a strategy.
Plug Rivo in and ask in plain English. Your AI tests hundreds of rules against trades that already settled, checks which held up on data they were never tuned on, and tells you in a sentence. No code, nothing to install.
The signal is about the game, not the venue.
When serious money takes a side on Polymarket or Kalshi, that is a read on the event itself, and the same game is priced at every sportsbook. Compare the whale's entry to your book's line and act wherever the price is best. Rivo shows you what smart money did and at what price. Where you place it is your call.
Kalshi and Polymarket
- 11 min read
Is Polymarket legit? How it works, who regulates it and where your money sits
Yes. Polymarket is a real prediction market with two separate products: a CFTC-regulated US exchange and an international crypto exchange. Here is how each one holds your money, settles your bets and handles disputes, with the full regulatory history.
- 11 min read
How does Polymarket work? Shares, prices and payouts explained
Polymarket sells shares in the outcome of real events. A share costs between 1 and 99 cents, the price is the market's odds, and a correct share pays $1. Worked trades, the order book, fees, resolution and the difference between Polymarket US and polymarket.com.
- 10 min read
How to withdraw from Polymarket: steps, fees and how long it takes
On polymarket.com you withdraw crypto to any wallet, free and near instant. On Polymarket US you withdraw dollars to your debit card, bank account or by wire in one to four business days. Step by step for both, the rules behind held withdrawals and the cheapest route to your bank.
- 11 min read
Polymarket fees explained: the formula, worked examples and rebates
Polymarket charges takers rate x shares x price x (1 - price) and pays makers a rebate. The rate runs from 0 to 0.07 by category on polymarket.com and sits at 0.0695 on Polymarket US. Full fee tables, rebates, builder fees, combo fees and how to pay less.
- 10 min read
Can you parlay on Polymarket? How combos work and how to build one
Yes. Polymarket calls parlays combos: several outcomes joined into one position paying $1 only if every leg wins. polymarket.com offers sports combos. Polymarket US offers 2 to 10 legs. Pricing math, the combo fee, void rules and a step-by-step build.
- 10 min read
Is Kalshi legit? Regulation, where your money is held and the real complaints
Yes. Kalshi is a CFTC-regulated exchange licensed since 2020, with its own regulated clearinghouse since 2024. Here is where your money sits, why Kalshi asks for your SSN, which complaints hold up and where Rivo fits.
- 10 min read
How does Kalshi work? Contracts, prices and payouts explained
Kalshi sells Yes and No contracts on real events. A contract usually costs 1 to 99 cents, the price reads as the odds, and a correct contract pays $1. Worked examples, the order book, fees, settlement and how the winners trade.
- 10 min read
How to withdraw from Kalshi: every method, fees and how long it takes
Kalshi charges no withdrawal fee. Debit card withdrawals land within hours, crypto within about 30 minutes and bank transfers in a few business days. Every method step by step, the security hold rules and why a withdrawal gets stuck.
- 11 min read
Kalshi fees explained: the formula, worked examples and maker fees
Kalshi charges takers 0.07 x contracts x price x (1 - price), rounded up to the cent. The most you pay is 1.75 cents a contract at 50 cents. Full fee tables from 1 to 99 cents, maker fees, rounding, deposit costs and how to pay less.
- 10 min read
Can you parlay on Kalshi? How combos work and how to make one
Yes. Kalshi calls parlays combos: two or more outcomes in one contract paying $1 only if every leg wins. Combos cover the NFL, college football, MLB, NHL, soccer, tennis, UFC, esports, stock indexes and crypto. Pricing math, fees, rules and a step-by-step build.
Bots
- 9 min read
How to build a Polymarket trading bot without code
A step-by-step walkthrough of building a Polymarket trading bot in Rivo: choosing a wallet or a signal as the trigger, reading the backtest, running it on paper, and what live means on Polymarket US versus Polymarket Global.
- 9 min read
How to build a Kalshi trading bot without code
A step-by-step walkthrough of building a Kalshi trading bot in Rivo: copying a named Kalshi trader or matching large trades by signal, reading the backtest, running it on paper, and going live through your own API key.
- 7 min read
Paper trading a prediction market bot before going live
Why every bot should earn a paper record first, how long to leave it there, what to read in the record before promoting it, and why paper results still do not promise live ones.
- 8 min read
The best prediction market bots in 2026 by what you want them to do
A roundup of prediction market bots for Kalshi and Polymarket, sorted by the job: copying a trader, running a signal, sniping a price, or trading by hand faster. What each does, what it costs, and where Rivo fits.
Copy trading
- 11 min read
Five mistakes that destroy copy-trading returns on Polymarket and Kalshi
The five most damaging failure modes in prediction-market copy-trading, why each one looks reasonable in the moment, and the specific corrective behaviors that protect returns.
- 10 min read
When to copy a whale and when to fade them: a decision framework
A structured decision framework for evaluating whether a given whale entry should be copied, deferred, or faded, with criteria for each path and the specific signals that justify the more counterintuitive responses.
- 10 min read
The best Polymarket traders to follow in 2026: a data-driven methodology
How to identify the best Polymarket and Kalshi traders to copy. A complete methodology for ranking wallets by resolved PnL, category specialization, and entry-price discipline.
- 11 min read
Polymarket copy-trading bots in 2026: how they work, what to use, what to avoid
A complete guide to Polymarket copy-trading bots. Compare signal bots, automated execution bots, and Telegram alert services. Understand the tradeoffs and pick the right tool for your strategy.
- 10 min read
Copy-trading vs fading: two strategies for trading whale activity on Polymarket and Kalshi
A detailed comparison of copy-trading and fading strategies on prediction markets. When to follow the whales, when to take the opposite side, and how to know which approach fits which trade.
Whale stats
- 10 min read
Are Polymarket whales profitable? An evidence-based analysis
A data-driven look at whether large bettors on Polymarket and Kalshi actually produce positive returns, what the structural features of the markets imply about whale edge, and how to weight wallets correctly for copy-trading.
- 10 min read
Whale win rates by category: politics, sports, crypto, macro, and culture
A category-level breakdown of where whale bettors produce the best resolved outcomes on Polymarket and Kalshi, why each category rewards a different kind of trader, and what the data implies for copy-trading strategy.
- 10 min read
Polymarket vs Kalshi whales
How the regulatory rails, trader composition, category mix, and trade-size distributions on Polymarket and Kalshi produce two different whale ecosystems, with data from resolved trades.
- 9 min read
Does bet size predict trading success on prediction markets?
An evidence-based examination of whether larger bets on Polymarket and Kalshi reliably correspond to better resolved outcomes, with the data on what size actually filters and what it does not.
- 8 min read
The biggest prediction-market wins of all time on Polymarket and Kalshi
A ranked list of the largest paper-PnL wins recorded across Polymarket and Kalshi, with analysis of the trade structures that produce leaderboard-scale outcomes and the methodology used to score the rankings.
- 9 min read
The biggest prediction-market losses of all time on Polymarket and Kalshi
A ranked list of the largest paper-PnL losses recorded across Polymarket and Kalshi, with analysis of the trade structures that produce the worst outcomes and the lessons available to copy-traders willing to study them.
- 9 min read
Where whales win the most: the structure of the biggest paying trades
An analysis of the largest paying whale trades across Polymarket and Kalshi, the categorical concentration of outsized payouts, and the structural reasons certain markets produce leaderboard entries while others do not.
- 9 min read
The markets where whales actually make money
An analysis of the categories and price ranges in which whale capital on Polymarket produces positive aggregate returns, with the structural reasons each pocket is profitable.
Fundamentals
- 9 min read
What is a whale on Polymarket and Kalshi?
A precise definition of the term whale in the prediction-market context, the size thresholds that separate whales from other participants, and how to evaluate the directional signal in a whale-sized trade.
- 10 min read
How prediction-market resolution works on Polymarket and Kalshi
A detailed explanation of how contracts are resolved on Polymarket and Kalshi, including the UMA oracle, dispute mechanics, invalid resolutions, and what resolution timing means for copy-traders.
- 9 min read
Reading prediction-market odds: prices, probabilities, payouts, and spreads
A complete reference for interpreting prediction-market prices on Polymarket and Kalshi, including the relationship between price and probability, payout math, fee structures, and how spread impacts copy-trading returns.
- 8 min read
Is Polymarket legal in the United States? A 2026 regulatory primer
A current explanation of Polymarket's and Kalshi's U.S. regulatory structures, the CFTC's role in event contracts, and why venue eligibility must be checked market by market. Not legal advice.
The guides are free. The signals aren't.
Reading the playbook is step one. Step two is having the alerts hit your phone the moment a real whale moves, before the line shifts.
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