LONDON - s4story -- Raiku, the reservation system for Solana blockspace, today launched rkuSOL, a liquid staking token whose validators earn additional revenue from selling blockspace through Raiku's auctions. Launch partners include Sanctum, Kamino, Loopscale and Exponent.

"For forty years, TradFi venues have earned from a stack of revenue lines," said Robin Nordnes, CEO and founder of Raiku. "Solana validators have only ever sold one, block production. With rkuSOL the validators behind it start selling a second: blockspace through Raiku's auctions, priced contractually before the trade happens. That revenue flows back to stakers. It's the first expansion of the Solana LST yield base since MEV arrived."

rkuSOL works like any Solana liquid staking token. Holders deposit SOL with Raiku-integrated validators and receive rkuSOL at the prevailing exchange rate. There's no supply cap, rkuSOL is minted as a receipt for deposited SOL, with the exchange rate adjusting over time as the underlying pool earns yield. Both the underlying stake pool and the Sanctum LST contracts are unmodified Solana primitives, multi-audited.

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The validators backing rkuSOL also sell compute capacity through Raiku's Ahead-of-Time (AOT) and Just-in-Time (JIT) auctions. Both run as first-price sealed-bid auctions; the difference is when they clear, AOT reserves slot inclusion up to 100 slots in advance, while JIT clears for same-slot inclusion. Revenue from these sales flows to stakers through the same proportional-stake distribution every other LST uses.

Sanctum provides the underlying LST infrastructure, routing rkuSOL through the Infinity liquidity pool from day one. Kamino has integrated rkuSOL as collateral on its lending markets, Loopscale supports it across its fixed-rate credit markets, and Exponent has listed it on its yield trading platform, with the RockawayX rkuSOL Yield Vault bringing everything together.

"We're very happy to partner with Raiku to launch rkuSOL. rkuSOL is a first-class citizen of Sanctum's unified infrastructure; holders automatically earn autocompounding yields and can access instant liquidity via Sanctum. The relationships we have forged with partners in the space also allows rkuSOL to be integrated and used throughout the Solana ecosystem from day one."

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Six external validator partners are committed for mainnet, with further validators joining the network progressively through Q3 2026. Additional DeFi integrations are also planned across the coming quarters.

Phantom and Jupiter both support rkuSOL from launch, giving users of Solana's two largest consumer-facing applications direct access to the token through their existing wallets.

rkuSOL is available from 3rd June 2026 at https://stake.raiku.com/.