Petro argues HIP-4, activated by Hyperliquid on May 2, is not a Polymarket clone but a new outcome primitive that settles on-chain in $USDH with cross-margin integration across perps and spot markets. While Polymarket and Kalshi printed $22B volume in April with on-chain prediction markets two orders of magnitude smaller, HIP-4's permissionless deployment via 1M $HYPE staking, unified margin mechanics, and end-to-end on-chain settlement differ fundamentally—though unresolved questions around close-side fee schedules, portfolio margin rollout, and non-curated builder deployment in Phase 2 will determine whether the market actually wants it.