A prediction market parlay is one position built from multiple outcome contracts. Every selected leg must win for the taker to receive the payout. “Prediction market combo,” “parlay,” “accumulator,” and “multi” describe the same broad idea, although each venue can use different pricing, cancellation, and settlement rules.
Parlays, combos and multi-leg prediction markets
Buying Yes on three separate prediction markets creates three independent positions. One can lose while the other two still pay. A parlay links the legs into a single condition: this outcome and this outcome and this outcome. One losing leg normally makes the full parlay lose.
The joint probability falls quickly as legs are added. If three independent legs each have a 60% chance, their combined probability is 0.60 × 0.60 × 0.60 = 0.216, or 21.6%. Fair decimal payout before fees would be roughly 4.63×. That larger payout is the reward for accepting a lower hit rate.
Why multiplying the legs is only a starting point
The simple multiplication above assumes independence. Real markets are often correlated. “BTC finishes higher” and “ETH finishes higher” share crypto-market risk. “The Fed cuts rates” and “Treasury yields fall” may react to the same macro information. Multiplying displayed probabilities without modelling that relationship can produce a badly mispriced combo.
A market maker estimates the joint distribution, then adds compensation for inventory risk, hedging cost, stale prices, liquidity, and adverse selection. Sharp takers do the opposite: they look for combinations where the quoted joint probability differs from their model.
Prediction-market prices are useful reference inputs, but they are not guaranteed probabilities. A leg trading at 0.60 in a thin order book may not deserve the same weight as a deep, tight 0.60 market.
Why Purrdict uses a request for quote
A separate order book for every possible combination does not scale. With 100 eligible markets there are 4,950 distinct two-leg combinations before choosing sides, and the number explodes for three or more legs. Most books would be empty.
Purrdict creates the instrument just in time. The taker selects the legs and size. The relay broadcasts that request to registered market makers. Each maker can return a cryptographically signed quote based on its own correlation and risk model. The taker selects a price and countersigns the exact terms.
- Build. Select non-contradictory HIP-4 outcome legs.
- Request. Send the canonical combination and desired stake to the relay.
- Compete. Independent makers price the same risk and return signed quotes.
- Accept. The taker countersigns one quote; neither party can change its fields afterward.
- Fill. Both sides' collateral moves directly into the on-chain escrow.
The relay brokers messages; it does not set the price or take custody of the trade collateral.
Collateral and parlay settlement
Parlays reference HIP-4 outcomes, but the combination is a separate synthetic contract on HyperEVM. It does not create a new native HIP-4 order book. At fill, the taker and maker collateral is locked in the Parlay escrow according to the signed quote.
If any required leg loses, the maker side collects the escrowed pot. If every leg wins, the taker collects it. A voided leg can be removed or refunded according to the contract rules, and an unresolved combination has a timeout path so collateral cannot remain locked forever.
Filling and settling are separate events. A quote can fill immediately, while the payout waits for every required leg to resolve and for the resolution/dispute rules to complete.
Cash out before every leg resolves
A sportsbook often turns a parlay into a locked ticket. Purrdict's v2 design supports a buyout: the current owner can receive a signed cash-out offer based on resolved legs, live market prices, remaining time, and correlation. Accepting it transfers the position through on-chain novation rather than asking the original contract to pretend it settled early.
Cash-out value can move sharply. When one leg wins, fewer conditions remain and the position may become more valuable. When a live leg moves against the taker, a maker may quote a steep discount or decline to quote at all. A cash-out offer is a price, not a guaranteed right.
What is live today?
The status language matters because search results often blur a working interface, a testnet protocol, and a mainnet financial product. Purrdict will update this page when the executable deployment changes networks.
Research and methodology
The Purrdict-specific execution, escrow, and status descriptions come from the system's implemented contracts, relay, and testnet flows. The combinatorial-pricing discussion is cross-checked against current prediction-market research rather than treating multiplied leg prices as a complete model.
- ParlayMarket: Automated Market Making for Parlay-style Joint Contracts — coherent pricing across base markets and their combinations.
- APMM: Automated Parlay Market Maker — liquidity fragmentation and shared information across combinatorial markets.
- Prices, Probabilities, and Parlays — empirical evidence that leg prices and parlay prices require product-specific calibration.
Prediction market parlay FAQ
What is a prediction market parlay?
A prediction market parlay combines two or more outcome legs into one all-or-nothing position. Every selected leg must resolve in the taker's favor for the parlay to pay.
Are prediction market combos the same as parlays?
The terms describe the same multi-leg idea in common usage. Some regulated platforms use “combo,” while betting products often use “parlay” or “accumulator.” Contract, pricing, and settlement details still vary by venue.
How does Purrdict price a parlay?
Purrdict sends the requested legs and size to competing market makers through a request-for-quote auction. Makers price the joint probability and correlation, sign quotes, and the taker chooses a quote before countersigning.
Are Purrdict parlays native HIP-4 markets?
No. The legs reference HIP-4 outcomes, but the multi-leg position is a separate synthetic instrument created on demand and collateralized in a HyperEVM escrow.
Are Purrdict parlays on mainnet?
The executable Parlay v2 contracts, relay, cash-out flow, and pooled vault are currently on HyperEVM Testnet. The Purrdict app can build HIP-4 combinations and show indicative pricing, but mainnet parlay settlement is not live yet.