HIP-4 on Hyperliquid: How Outcome Markets Work, Outcome.xyz, Multi-Outcome Trading and How It Compares to Polymarket and Kalshi (2026)

HIP-4 is the Hyperliquid standard for on-chain prediction markets: fully collateralized outcome contracts priced between 0 and 1 that trade on the same order book, in the same account and with the same USDC as Hyperliquid perps. It launched on May 2, 2026 when Outcome.xyz deployed a daily Bitcoin price market, and it has since expanded to multi-outcome markets on crypto, macro data and world events. This guide explains how HIP-4 works, how to trade a market step by step, and how it compares with Polymarket and Kalshi.

Key takeaways

• HIP-4 = outcome markets on HyperCore. Binary contracts pay 1 USDC if the event happens and 0 if not; price equals implied probability.
• Fully collateralized, no leverage, no liquidation. Your maximum loss is what you pay for the contract.
• CLOB, not AMM. Outcome markets use Hyperliquid's central limit order book, so you get limit orders, tight spreads and sub-second fills.
• Two market types: canonical markets that follow protocol-vetted resolution rules, and permissionless markets deployed by anyone who stakes HYPE.
• Outcome.xyz launched the first market (daily BTC) on May 2, 2026 and remains the largest deployer; multi-outcome markets arrived in mid-2026.
• Versus Polymarket (Polygon, UMA resolution, largest volume) and Kalshi (CFTC-regulated, KYC, US-legal), Hyperliquid wins on speed and integration with derivatives; it trails on event breadth and is geo-blocked in the US.

What is HIP-4 on Hyperliquid?

Hyperliquid's improvement proposals define how new kinds of markets get onto the chain. HIP-1 covers spot tokens, HIP-2 their liquidity, and HIP-3 permissionless perpetual futures, which we explain in HIP-3 builder markets. HIP-4 adds a fourth market type: outcome markets, the general term the protocol uses for what most people call prediction markets or event contracts.

The core object is an outcome contract. It represents a claim on one outcome of a defined event: "BTC closes above $100,000 on the daily close", "the Fed cuts at the September meeting", "Candidate A wins". Every contract pays out exactly 1 USDC if its outcome occurs and 0 USDC if it does not. Between deployment and resolution it trades at a price between 0 and 1, and that price is the market's implied probability. A YES contract at 0.62 means the order book thinks there is roughly a 62% chance.

What makes HIP-4 different from bolting a prediction market onto a general-purpose chain is where it lives. Outcome contracts are native HyperCore assets. They trade on the same matching engine, settle in the same USDC balance and appear in the same portfolio as your perp positions. If you already use the Hyperliquid app DEX, you already have everything you need to trade them.

HIP-4 mechanics: collateral, pricing, resolution, fees

Full collateralization

HIP-4 markets are fully collateralized. When a contract pair is created, 1 USDC of collateral backs each YES/NO pair. Buying YES at 0.40 costs 0.40 USDC per contract; the seller of that YES is effectively holding NO and has 0.60 USDC at stake. At resolution the 1 USDC goes to whichever side was right. There is no margin, no funding rate and no liquidation engine involved. This is why outcome markets are structurally simpler and lower-risk than the perps sitting next to them, and why our leverage and liquidation guide does not apply here.

Pricing 0–1 on a central limit order book

Polymarket popularised order-book prediction markets; many other venues use AMMs. HIP-4 uses Hyperliquid's CLOB, which means you can place limit orders at exactly the probability you want, see the full depth on both sides, and get filled in under a second by the same engine that clears billions of dollars of perps daily. Spreads on active markets are typically one or two cents. Prices are quoted in USDC with a minimum tick that the deployer sets (commonly 0.01 or 0.001).

Canonical vs permissionless outcome markets

HIP-4 defines two tiers.

Canonical outcome markets follow a protocol-vetted resolution framework: standardised event definitions (for example, "asset X above price Y at time Z using the Hyperliquid oracle") whose resolution is mechanical and verifiable on-chain. Daily and weekly crypto price markets fall into this bucket. Because the resolution source is the chain's own oracle, disputes are rare.

Permissionless outcome markets can be deployed by anyone who meets the stake requirement, on any question, with the deployer specifying the resolution source and acting as resolver. This tier covers macro data, sports, politics, corporate events and anything else a deployer thinks will attract trading. The deployer's staked HYPE is the bond; if validators determine a resolution was fraudulent or violated the published rules, the stake can be slashed and the market re-resolved.

Resolution and oracles

Every HIP-4 market carries on-chain metadata specifying the event, the resolution source, the resolution time and the resolver. When the event concludes, the resolver submits the outcome. After a short challenge window during which validators can flag an incorrect resolution, the market finalises and winning contracts redeem for 1 USDC. For canonical crypto-price markets, the resolver reads the Hyperliquid oracle directly; for permissionless markets, it might be a government statistics release, an official sports result or a news source named in advance. Read the resolution rules before you trade; ambiguity in the question is the most common way to lose money in any prediction market.

Fees

HIP-4 markets charge trading fees on the same maker/taker model as the rest of the exchange, scaled to the contract's notional (a contract at 0.50 has 0.50 USDC of notional). The deployer can take a share, mirroring HIP-3, and front-ends can attach builder codes. There is no fee for holding to resolution or for redeeming winning contracts. Compare with Polymarket (no trading fees on most markets, funded by other means) and Kalshi (fees on profitable trades). Full schedule in the Hyperliquid fees guide.

The launch: Outcome.xyz and the daily BTC market (May 2, 2026)

HIP-4 went live on mainnet on May 2, 2026, one day after Kraken closed its Bitnomial acquisition and in the same window as several other major 2026 milestones (see Hyperliquid news). The first deployer was Outcome.xyz, a team formed specifically to build on HIP-4, and its first market was deliberately simple: a daily BTC market asking whether Bitcoin's price at the daily close would be above a strike set that morning.

The choice was smart for three reasons. Crypto price markets resolve mechanically from the Hyperliquid oracle, so there was no resolution risk to debut with. Hyperliquid's user base already trades BTC all day, so demand was guaranteed. And a daily cadence meant hundreds of resolutions in the first months, stress-testing the redemption flow.

Outcome.xyz expanded quickly: weekly and monthly BTC and ETH strikes, HYPE price markets, then macro (CPI prints, Fed decisions), then event markets. By September 2026 it runs the majority of HIP-4 open interest. Other deployers have followed, some focusing on sports, others on crypto-native events such as token launches and protocol votes. "Outcome xyz" is now shorthand for the Hyperliquid prediction market the way "xyz" is shorthand for HIP-3 stocks.

Multi-outcome markets

The May launch supported binary markets only. In mid-2026 the protocol enabled multi-outcome markets, where a single event has several mutually exclusive outcomes, each with its own contract. Examples: "Which range will BTC close in this week?" with five price buckets, "Who wins the election?" with each candidate as an outcome, or "Fed decision" with hold / 25bp cut / 50bp cut.

Mechanically, each outcome is a separate order book whose contract pays 1 USDC if that outcome occurs. Because exactly one outcome must happen, the prices across all outcomes should sum to about 1.00; when they sum to more or less, arbitrageurs step in, which keeps multi-outcome pricing honest. For traders this means you can express a precise view (BTC ends between $105k and $110k) rather than a blunt one (BTC above $105k), and you can build spread positions across buckets. It also means thinner liquidity per outcome, since volume splits across the books.

How to trade a HIP-4 outcome market, step by step

Trading an outcome market takes about two minutes if you already have a funded account. If you do not, start with how to trade on Hyperliquid and the bridge and deposit guide.

1. Open the outcome markets tab in the app (alongside Perps and Spot). Markets are grouped by deployer and category; Outcome.xyz's daily BTC market is usually pinned at the top.
2. Read the market details. Click the market to see the exact question, the strike or condition, the resolution source, the resolution time and the deployer. For a daily BTC market, confirm which oracle price and which close time are used. This step matters more than anything else.
3. Check the order book. The YES side and NO side are displayed as a single book (buying YES at 0.40 is the same as selling NO at 0.60). Look at depth near the current price; on a fresh market it may be thin.
4. Choose your side and size. Enter the number of contracts. The app shows your cost (contracts × price) and your maximum payout (contracts × 1 USDC). The difference is your potential profit.
5. Place a limit or market order. Limit orders at your chosen probability pay the maker fee if they rest; market orders pay the taker fee and fill immediately. Because there is no leverage, the entire cost is deducted from your USDC balance up front.
6. Manage the position. You can sell contracts back into the book at any time before resolution to lock in a gain or cut a loss. You do not have to hold to expiry.
7. Resolution and redemption. After the resolver submits and the challenge window passes, winning contracts become redeemable for 1 USDC each; the app redeems automatically or with one click, and losing contracts expire worthless.

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Programmatic traders can reach outcome markets through the same REST and WebSocket endpoints as perps, with outcome assets exposed as their own asset class in the info API; see the Hyperliquid API guide and the HIP-4 section of the official docs.

Hyperliquid HIP-4 vs Polymarket vs Kalshi

The "hyperliquid vs polymarket" and "kalshi hyperliquid" comparisons come up constantly, so here is the structural picture as of September 2026.

Where Hyperliquid wins. Speed and integration. A trader who is long BTC perps can buy NO on "BTC above $X" in the same account as a partial hedge, something neither Polymarket nor Kalshi can offer. The CLOB is faster and the crypto-price markets resolve from the chain's own oracle with no dispute layer. Fees flow to HYPE buybacks and deployers rather than to a company.

Where Polymarket wins. Breadth and depth on event markets. Polymarket is the venue for politics and culture, with liquidity in the tens of millions on headline events. Its UMA resolution has had disputes, but it is battle-tested across thousands of markets. Most of its markets have no trading fee.

Where Kalshi wins. Legality for US residents. Kalshi is a CFTC-designated contract market with KYC and bank deposits, which is exactly what a US retail trader needs and exactly what Hyperliquid's app does not provide. Its resolution is backed by a regulated entity.

The honest summary: HIP-4 is the best venue for crypto-price outcome markets and for anyone who already trades on Hyperliquid; Polymarket is the best venue for world events; Kalshi is the best (and only compliant) venue for US residents. If the Kraken/Bitnomial arrangement reported by Bloomberg in August 2026 materialises, the US question may change.

Strategies for HIP-4 outcome trading

Outcome markets reward a different skill set from perps. Some approaches experienced traders use, none of which is advice:

• Probability disagreement. The simplest edge: you believe an outcome is more or less likely than the price implies. Buy when your estimate exceeds the price by a margin that covers fees and uncertainty.
• Hedging perp exposure. Long BTC perps plus NO on a "BTC above strike" daily market caps your downside for the day at a known cost. This is the use case that only Hyperliquid offers.
• Multi-outcome arbitrage. When the prices of all outcomes in a multi-outcome market sum to noticeably more or less than 1.00, a basket trade captures the difference. Competition for this is fast and automated.
• Market making. Quoting both sides of a daily BTC market collects the spread and maker rebates. It requires an accurate probability model and fast cancellation as spot moves.
• Event-driven timing. Macro markets reprice sharply at data releases; positioning before, or fading overreactions after, is a classic prediction-market strategy that now runs on a sub-second book.

HIP-4 risks

• Resolution risk. The market pays on the resolver's reading of the rules. Ambiguous questions, disputed sources or a delayed resolution can cost you even when your prediction was "right" in spirit. Read the criteria and prefer canonical markets when the question allows.
• Deployer risk. Permissionless deployers set the rules and resolve. The HYPE stake and validator challenge deter fraud but do not eliminate incompetence.
• Liquidity risk. Outside the flagship BTC markets, books can be thin; a market order can fill many cents away from the last price.
• Total loss. No leverage means no liquidation, but a contract that resolves against you goes to zero. Size accordingly.
• Regulatory risk. Prediction markets are a regulatory focus in many countries; the app already geo-blocks the US and access rules can change.

Risk note: prediction markets can lose 100% of the amount staked on a single resolution; never trade with funds you cannot afford to lose.

Deploying a HIP-4 market: requirements for builders

If you want to become the next Outcome.xyz rather than trade on it, the deployer path mirrors HIP-3 but with lighter requirements. As of September 2026:

• Stake HYPE. Permissionless outcome-market deployers post a HYPE bond that is slashable on fraudulent resolution. The amount is lower than HIP-3's 500,000 HYPE and scales with the deployer's number of live markets; check the current figure in the HIP-4 docs.
• Define the market on-chain. Question text, outcomes, resolution source, resolution time, resolver address, tick size and any fee share are committed at deployment and cannot be changed afterwards.
• Resolve promptly and transparently. Deployers commit to a resolution deadline and publish evidence. Validators can challenge within the window.
• Choose canonical templates where possible. For price-based markets, using the canonical framework removes resolution disputes and makes your market eligible for front-end promotion.
• Front-ends can use builder codes to earn on order flow, exactly as with perps; see trading bots and builder codes.

The "hip 4 hyperliquid docs" you want are the HIP-4 section of the official GitBook plus Outcome.xyz's own documentation on resolution standards, which has become a de facto reference for other deployers.

Bottom line

HIP-4 brings prediction markets onto Hyperliquid as first-class, fully collateralized outcome contracts that trade on the fastest order book in DeFi and share an account with your perps. Since Outcome.xyz's May 2, 2026 launch with a daily BTC market, the standard has grown to multi-outcome markets across crypto, macro and events, making Hyperliquid a credible third option next to Polymarket's breadth and Kalshi's US legality. Its unique edge is hedging and speed; its limits are event coverage, resolution reliance on deployers and the US geo-block. Read every market's resolution rules before you trade, and treat outcome contracts as what they are: bets that can go to zero.