Raiku

Raiku is a coordination layer for Solana that replaces probabilistic mempool inclusion with deterministic blockspace reservations, enabling developers and institutions to schedule transactions with guaranteed execution outcomes rather than competing on priority fees alone.

The Problem Raiku Addresses

Solana's high throughput comes with a trade-off: during network congestion, even well-fee'd transactions can fail to land, arrive in the wrong order, or be dropped entirely. Protocol-level upgrades such as APE, MCL, and Alpenglow improve raw speed and throughput, but they do not give applications the execution-time certainty that regulated finance, high-frequency DeFi, and institutional settlement demand. Raiku's thesis is that blockspace should behave like a programmable, guaranteed resource rather than an unpredictable commodity.

Core Mechanism

Raiku runs as a lightweight sidecar alongside standard Solana validators rather than replacing the validator software or introducing a separate chain. Two reservation primitives form its execution model:

Ahead-of-Time (AOT) reservations. Developers or applications bid for upcoming block slots before those slots are produced. Upon winning a reservation, they receive an inclusion signal—a pre-confirmation guarantee that their transaction will land in a specific future block. This removes the retry loop that most applications currently require and brings execution latency down to 30–50 milliseconds.

Just-in-Time (JIT) MEV bundle processing. For workloads where timing cannot be committed in advance—reactive liquidations, arbitrage, real-time price updates—JIT execution lets applications bid for inclusion at the moment a slot opens. This handles demand that is reactive rather than scheduled.

Both mechanisms flow through an Ackermann-node, Raiku's programmable scheduler network. Ackermann nodes sit between applications and validators, coordinate reservations, manage burst demand, and enforce the terms of each commitment. Validators running the Raiku sidecar earn additional fee revenue for honouring these commitments without sacrificing their existing block rewards.

Key Features

• Deterministic transaction landing. AOT reservations replace probabilistic inclusion with a contractual guarantee. Applications can drop retry and re-submission logic entirely.
• Pre-confirmations. Users and applications receive binding confirmation signals before finality, enabling real-time UX without waiting for block confirmation.
• MEV-resistant ordering. The transparent auction model for blockspace means ordering is based on explicit bids rather than private searcher relationships, making MEV more auditable and less predatory.
• Application-specific filtering. Raiku's scheduler can apply compliance logic—KYC checks, jurisdiction filtering, counterparty rules—at the execution layer, which is required for regulated institutional participants.
• Proof streaming. Large transaction payloads can be split across sequentially reserved slots, bypassing per-block data limits without requiring a separate data availability layer.

rkuSOL Liquid Staking Token

Raiku has launched rkuSOL, a liquid staking token that stakers receive when they delegate SOL to Raiku validators. rkuSOL accrues standard Solana staking rewards and, additionally, a share of fees generated from AOT and JIT transaction processing on Raiku-participating validators. The token is non-custodial and has been audited by Sanctum.

Team and Funding

Raiku was founded in July 2024 by Robin Nordnes (CEO) and a team of approximately 20 people. The project launched on Solana Devnet in December 2024 and moved to testnet with validators including Kiln, Figment, Everstake, Chorus One, and Blockdaemon.

The project has raised $13.5 million in two rounds:

• Pre-seed ($2.25M, October 2024): Co-led by Figment Capital and Big Brain Holdings.
• Seed ($11.25M, August 2025): Led by Pantera Capital, with Jump Crypto, Lightspeed Faction, and HashKey Capital.

Notable angels include Solana co-founder Anatoly Yakovenko and Austin Federa (former Solana Foundation).

Solana Ecosystem Fit

Raiku does not fork Solana or introduce a competing consensus mechanism. Its validator sidecar model means security is inherited from Solana's existing validator set. The coordination layer addresses a gap that Solana's base protocol intentionally leaves open: applications that need execution-time guarantees can now access shared, validator-run coordination rather than building private sequencers.

Target use cases include institutional FX and stablecoin settlement, DeFi atomic multi-leg execution, on-chain liquidation bots, high-frequency market-making, and payment rails requiring pre-confirmation receipts. As of mid-2026, Raiku is in active testnet operation with mainnet launch planned pending SIMD formalization and a Solana governance vote.