Raiku

Raiku is a Solana blockspace coordination layer that transforms unpredictable transaction landing into a guaranteed, schedulable resource through sealed-bid slot auctions run alongside the validator network.

The Problem: Solana's Execution Reliability Gap

Solana processes hundreds of thousands of transactions per second and offers sub-second finality, but the network's first-come-first-served approach to block inclusion creates a fundamental reliability problem for high-stakes applications. During periods of congestion, transaction failure rates have historically reached 75% or higher. For DeFi protocols executing liquidations, oracle operators pushing price updates, institutions settling tokenized assets, and trading desks running arbitrage strategies, "fast but unreliable" is not an acceptable infrastructure guarantee. The cost is not just a failed trade — it is a loan that goes unliquidated, a price feed that goes stale, a settlement that fails to land.

Raiku describes this as the infrastructure gap between a fast blockchain and what it calls the "Certainty Economy": a financial system where participants know, before submission, exactly when and where their transaction will execute.

Core Mechanism: AOT and JIT Slot Auctions

Raiku introduces two complementary transaction types, each designed for a different urgency profile:

Ahead-of-Time (AOT) lets users pre-purchase a guaranteed inclusion slot at least 35 slots — roughly 15 seconds — in advance. The reservation is made through a first-price sealed-bid auction. AOT is designed for predictable, scheduled operations: oracle price updates, institutional debt repayments, vault rebalancing, recurring DeFi actions. The key value is certainty hours or minutes before a transaction needs to land, not just milliseconds.

Just-in-Time (JIT) guarantees top-of-block inclusion in the very next slot. Minimum bids are set at the current Solana priority fee plus a 5% premium, again via sealed-bid auction. JIT targets time-critical operations where the window to act is measured in milliseconds: liquidations, arbitrage capture, emergency vault rescues, NFT mints during high demand.

Both auction types are coordinated off-chain and enforced on-chain through two infrastructure components:

The Ackermann Node (Planner) receives transaction intents from integrators via the Raiku SDK, runs AOT and JIT auctions in real time, allocates slots to winning bids, issues pre-confirmations to users, and monitors the health of participating validators.

The Ackermann Sidecar (Enforcer) runs alongside the validator client — compatible with both Firedancer and Agave, Solana's two main client implementations. The sidecar bypasses Solana's QUIC transport layer to prevent network-level drops, enforces slot-inclusion QoS (siQoS) and stake-weighted QoS (swQoS), and can reroute transactions to healthy sidecars without breaking inclusion guarantees. Confirmation speeds cited by the team are 30–50 milliseconds.

A secondary blockspace market handles unused reserved slots in real time, dynamically rebalancing supply between AOT and JIT demand so allocated blockspace does not go to waste.

rkuSOL: Liquid Staking with Blockspace Revenue

Raiku launched rkuSOL, a liquid staking token that introduces a new yield source to Solana's staking economy. Unlike standard LSTs that pass on only base staking rewards, rkuSOL holders earn both traditional staking yields and a share of revenue generated by validators participating in Raiku's AOT and JIT blockspace auctions.

rkuSOL has no supply cap. Its exchange rate accrues as yield builds from both sources. The token launched with integrations across several prominent Solana DeFi protocols: Sanctum provides autocompounding and instant liquidity, while Kamino, Loopscale, and Exponent offer additional DeFi composability. Sanctum's CEO described rkuSOL holders as automatically earning autocompounding yields with access to instant liquidity through the Sanctum integration.

Six external validators committed to the launch, providing the initial blockspace supply that feeds auction revenue back to rkuSOL holders.

Additional Features

Proof Streaming breaks large payloads — ZK proofs, batch trade settlements — into verifiable chunks spread across sequential slots, enabling complex computations that would otherwise exceed single-block limits.

The roadmap includes a Global Account Model in V2, which would provide unified user identity across Raiku extensions and Solana L1, along with multi-VM support and EVM compatibility.

Funding and Backing

Raiku raised $13.5 million across two rounds. A $2.25 million pre-seed was co-led by Figment Capital and Big Brain Holdings, with participation from Reciprocal Ventures and Anagram. An $11.25 million seed round followed, led by Pantera Capital, with Jump Crypto, Lightspeed Faction, and HashKey Capital also participating. Both rounds were structured as SAFEs with token warrants.

Angel investors include Solana co-founder Anatoly Yakovenko and former Solana Foundation head of strategy Austin Federa. The project has also received support from the Solana Foundation and Superteam.

Pantera partner Nihal Maunder noted that Raiku's architecture "offers real-world reliability and opens the door to the next generation of onchain financial systems."

Team

Raiku was founded by Robin Nordnes and has grown to approximately 20 employees with operations across Europe and Asia. The project began development in July 2024, reached devnet in December 2024, and moved to testnet with validator partners through 2025. Engineering team lead Jason Davis has been publicly visible in the project's technical communications.

Solana Ecosystem Fit

Raiku sits at the intersection of two of Solana's most active development vectors: validator economics and institutional infrastructure. The network's speed has attracted institutional capital — tokenized equities, stablecoins, real-world assets — but the absence of guaranteed execution has remained a friction point for financial applications that cannot tolerate uncertainty at settlement. Raiku addresses this without introducing a new chain, new token standard, or sequencer trust assumption. It operates as a sidecar to existing validator infrastructure, meaning the reliability guarantee is enforced at the validator layer, not through an off-chain promise.

By routing new revenue streams to validators through blockspace auctions, Raiku also addresses validator economics — creating a demand-driven supplement to issuance-based staking rewards. For users and protocols, the choice between AOT and JIT maps cleanly onto existing operational patterns: scheduled treasury management and oracle operations on one side, latency-sensitive DeFi execution on the other.

The project's framing — "What You Send Is What You Get" — reflects a thesis that the next phase of Solana adoption, particularly for regulated financial institutions and high-frequency applications, requires infrastructure that treats execution certainty as a baseline rather than a best-effort.