POST
Docs ->outcomeMeta
Returns currently active outcomes with their descriptions and side specifications.
outcomes[]questions[]sideSpecsnamedOutcomesfallbackOutcome
HIP-4 API for Hyperliquid Prediction Markets
The most complete HIP-4 API stack
Integrate Hyperliquid prediction markets using the leading tech stack, trusted by 80+ teams.
Infrastructure by an active-set Hyperliquid validator
TL;DR
We provide the best dev experience for teams integrating HIP-4. Convenient API schema, direct connection to founders, and quick implementation of feature requests. Hydromancer is built for ambitious teams.
Trusted by teams building on HIP-4
Outcome MarketsPrediction app teamsOracle builders
§ What is HIP-4
Prediction markets, native to Hyperliquid
HIP-4 lets teams deploy outcome markets, contracts in the style of prediction markets and binary options. Price discovery happens through CLOB, akin to spot markets on Hyperliquid.
The core difference between Polymarket, Kalshi, and Hyperliquid is that outcome markets are builder-deployed. Any team staking enough HYPE can deploy outcome markets, similar to perp markets deployed using HIP-3.
An outcome is a single market with one or more sides, typically Yes / No. A question groups outcomes together with a fallbackOutcome. At expiry, each outcome resolves to a settleFraction between 0 and 1.
Hydromancer is the data layer: we index every registered outcome, surface settlement the moment it lands, provide analytics, and expose all of it through the full HIP-4 endpoint surface.
Also trusted by leading HIP-3 and Hyperliquid builders
BasedKinetiqMasstread.fiVentualsLiquidBullpenSEDADexariSenpiGlobal ComputeAura+25 others
§ Endpoints
All HIP-4 API endpoints in one stack
Query active outcomes, registered markets, enriched stats, settlement data, and resolution history through one production API.
POST
Docs ->registeredOutcomes
Recently registered, unsettled outcomes, newest first. Filter by class, underlying, or period. Perfect for new market feeds.
outcomeIdclassunderlyingexpiryyesStatsnoStats
POST
Docs ->registeredOutcomesById
Returns metadata and stats for one or more registered prediction market outcomes that have not yet been settled.
outcomeIdnamedescriptionclassunderlyingyesStatsnoStats
POST
Docs ->settledOutcomes
Recently settled outcomes, newest first. Filter by class, underlying, period, or name. Powers history feeds and resolution timelines.
outcomeIdnameclassunderlyingsettleFractionsettlePrice
POST
Docs ->settledOutcomesById
Returns metadata and enriched stats for one or more settled prediction market outcomes, including first trade, largest trade, vWAP, unique traders, and more.
outcomeIdsideSpecsyesAssetIdnoAssetIdsettleFractionsettlePriceyesStatsnoStatsexpirytargetPriceperiodquoteToken
§ One stack
Fully composable with the rest of Hyperliquid
Our HIP-4 endpoints share auth, shape, and infrastructure with our core Hyperliquid DEX and HIP-3 stack. Integrate once and get the whole Hyperliquid data surface with it.
Core DEX+
Hyperliquid main
Perps, spot, L2/L4 orderbook, fills, liquidations, and user state.
Builder perps+
HIP-3 stack
Every deployer's custom perpetual, with stats, liquidity, maker activity, and risk dashboards.
This page=
HIP-4 endpoints
Prediction-market outcomes, questions, and resolutions across the full HIP-4 surface.
Integrating HIP-4 does not add another vendor. It unlocks complete Hyperliquid data access, from perp orderbooks to builder-deployed markets to prediction-market settlements, through one consistent surface.
§ Pricing
Transparent pricing for every stage
Three standard tiers plus bespoke pricing for partners who need unlimited calls or custom Hyperliquid data. All tiers include full HIP-4 and Hyperliquid endpoint access and testnet APIs.
Starter
$300/mo
For recently launched apps
✓500k tokens / month
✓$60 per 100k tokens overage
✓Full HIP-4 endpoints
✓Testnet APIs included
Growth
$1,200/mo
Best plan for scaling teams
✓3M tokens / month
✓$25 per 100k tokens overage
✓Full HIP-4 endpoints
✓Testnet APIs included
Scale
$2,500/mo
For data-rich, large apps
✓15M tokens / month
✓$10 per 100k tokens overage
✓Full HIP-4 endpoints
✓Testnet APIs included
Enterprise
Custom
Bespoke pricing for partners
✓Unlimited API calls
✓Unlimited address monitoring
✓Dedicated support channel
✓SLA and private infrastructure
Add-on features like extra market-data endpoints and allfills are available as separate purchases. See the full pricing page for details.
Ship HIP-4 on Hyperliquid's most complete infrastructure stack.
80+ teams on Hyperliquid already run on Hydromancer. Get an API key in minutes and start integrating Hyperliquid the same day.
§ FAQ
Frequently asked questions
What is HIP-4 on Hyperliquid?
HIP-4 is the Hyperliquid standard for registering prediction-market outcomes and questions natively on the L1. Outcomes are discrete yes/no or multi-sided markets; questions group outcomes with a fallback resolution path.
Which HIP-4 endpoints does Hydromancer support?
All five: outcomeMeta, registeredOutcomes, registeredOutcomesById, settledOutcomes, and settledOutcomesById, covering the full HIP-4 surface area.
What's the difference between HIP-3 and HIP-4?
HIP-3 lets builders deploy custom perpetual contracts on Hyperliquid. HIP-4 extends that to prediction-market outcomes and questions with discrete event contracts, on-chain settlement, and programmable oracles.
Can I build a Polymarket-style app on HIP-4?
Yes. HIP-4 exposes binary outcomes, multi-outcome questions, and oracle-driven resolution on Hyperliquid's L1 with shared orderbook liquidity.
Does the HIP-4 API work alongside Hyperliquid's main DEX and HIP-3 data?
Yes. Hydromancer's HIP-4 endpoints share auth, request shape, and infrastructure with the core Hyperliquid DEX and HIP-3 stack.