Relay Protocol

Relay Protocol is cross-chain payments infrastructure that lets users move assets across more than 85 blockchains in seconds, without wrapped tokens, pooled liquidity, or manual bridge steps. Built by the team behind Reservoir — an NFT and token trading protocol that raised a $14 million Series A — Relay launched in 2024 as the evolution of that infrastructure into a general cross-chain execution layer. In February 2026, Relay raised a $17 million Series B led by Archetype and Union Square Ventures to fund the launch of the Relay Chain, a dedicated settlement layer that anchors the protocol's long-term scalability.

Intent-Based Architecture

At the core of Relay is an intent model. Rather than managing individual bridge transactions across chains, users specify what they want to end up with: a particular token, on a particular chain, in a particular amount. Solvers — entities that already hold balances on destination chains — read these intents and front the funds to the user almost immediately. The user's assets on the origin chain are locked in a non-custodial Depository contract, and the solver is later reimbursed when settlement is proven.

This architecture bypasses the multi-minute confirmation delays that characterize traditional lock-and-mint bridges. Because a solver is transferring from their existing balance rather than waiting for cross-chain messages to propagate, the user receives funds on the destination chain within seconds — typically under three seconds. The solver assumes the confirmation risk briefly, but the Depository contract ensures they are made whole once the origin-chain lock is verified.

Relay Chain: Purpose-Built Settlement

The Relay Chain is a bespoke blockchain launched in early 2026 as Relay's dedicated settlement infrastructure. Rather than settling every cross-chain order individually on the origin chain, solvers accumulate a running balance on the Relay Chain. They fill orders continuously, see their hub balance updated in near-real-time via oracle attestation, and only submit a batch claim when they choose to withdraw their earnings. This batch approach means one efficient proof covers thousands of individually filled orders, dramatically reducing the per-order cost of capital recovery.

The chain pairs a high-performance sequencer capable of approximately one-millisecond soft confirmations with Celestia's data availability layer for high-throughput, low-cost blockspace. The result is settlement infrastructure that can scale with the volume of intents flowing through the protocol without becoming a bottleneck. From the solver's perspective, running on Relay Chain transforms a fragmented multi-chain balancing act into a single venue where liquidity can be concentrated and efficiently recycled.

Solana as a First-Class Chain

Most cross-chain infrastructure treats Solana as an afterthought or excludes it entirely because its account model differs structurally from EVM chains. Relay treats Solana as a first-class supported network. Users can bridge ETH directly to SOL on Solana, move stablecoins between Solana and Base, or use Relay's quote-execute API to route any supported asset from any supported EVM or non-EVM chain into a Solana wallet in a single signed transaction.

This matters practically: the December 2025 launch of the Base-Solana bridge — backed by Coinbase and Chainlink — named Relay as an early integration partner alongside Zora, Aerodrome, Virtuals, Flaunch, and others. Relay's API handles the cross-chain routing layer that makes those user-facing integrations possible.

Scale and Integrations

Since its 2024 launch Relay has processed over five million user wallets, more than 50 million transactions, and over five billion dollars in cumulative volume. The protocol claims 99.9% uptime across its 85-plus supported networks. These figures are self-reported; independent on-chain verification is not straightforward given the distributed nature of solver settlement.

The integrations tell a more verifiable story. Phantom, MetaMask, OpenSea, and Coinbase Wallet all rely on Relay's cross-chain infrastructure to power bridging and swapping features inside their products. These are among the highest-volume user interfaces in crypto. That distribution reach means Relay's intent infrastructure is already running beneath millions of user interactions that carry no Relay branding at all — it operates as white-label plumbing.

Security Model

Relay deliberately avoids the architecture that led to roughly two billion dollars in bridge hacks during 2022. Traditional bridges pool user funds into a single smart contract and mint wrapped representations on destination chains, creating large concentrated targets. Relay has no pooled treasury and no wrapped tokens. Each order is settled individually through the Depository, which limits any single point of failure to the value of one user's order rather than the total locked value in a pool.

The current version of the protocol runs a single primary relayer handling execution, which is an acknowledged centralization point. Relay has stated plans to expand to a bonded relayer network — permissioned solvers who post collateral — but this transition had not been completed as of the $17M Series B announcement. Until a permissionless or bonded solver set is live, the protocol's liveness depends on that primary relayer remaining operational and honest.

Fees and Speed

Relay's self-reported fee structure places its costs at 80% or more below traditional bridge protocols for transfers under one thousand dollars, with execution completing in seconds rather than minutes. The mechanism explains the cost advantage: traditional bridges spend gas on message-passing contracts, oracle updates, and token minting at both ends of a transfer. Relay's intent model reduces origin-chain interaction to locking funds in the Depository (approximately 21,000 gas for a native token deposit) and destination-chain interaction to a simple transfer from the solver's existing balance.

The predictable fee and guaranteed rate model — where the user sees exactly what they will receive before signing — is a meaningful UX improvement over bridges that quote an estimated output and then deliver something different after slippage and dynamic fees.

Developer API

Relay exposes a three-endpoint API — Quote, Execute, and Status — that developers integrate to add cross-chain functionality to their applications. The quote endpoint returns a price and route; the execute endpoint signs and submits the intent; the status endpoint tracks fulfillment. This simplicity is how Relay powers complex multi-chain applications like Phantom's swap interface without requiring those applications to implement their own cross-chain logic. The documentation advertises a functional first integration in under five minutes.