Relay, also known as Relay Protocol, is a multichain payments network launched in 2024. It is designed to facilitate asset bridging and transactions across numerous blockchain networks for both end-users and developers. ^[1]

Overview

Relay was developed to address the complexities and inefficiencies associated with traditional cross-chain bridges, such as long wait times and high transaction costs. The protocol provides a full-stack solution that enables users and applications to move assets and execute transactions across different blockchain ecosystems. The system is built to function as a multichain payments network, emphasizing speed, low costs, and reliability for enterprise-grade applications. ^[1]

Since its launch in 2024, the network has reported significant adoption, processing over 50 million transactions for 5 million users, with a total transaction volume exceeding $5 billion. The platform supports more than 85 blockchain networks, aiming to abstract the complexities of a multichain environment. Its infrastructure is utilized by various Web3 companies, including marketplaces like OpenSea and wallet providers like Phantom, to simplify cross-chain interactions for their user bases. ^[1]

Technology

Relay's architecture is a full-stack solution composed of a core protocol that powers a suite of products for different user types. The technology combines a cross-chain intent system with decentralized exchange (DEX) meta-aggregation to execute transactions efficiently. ^[1]

Core Components

The protocol's functionality is based on two primary technological pillars:

• Cross-Chain Intents: This is the foundational layer of the network. It is an open system that connects users who wish to perform a cross-chain action with a network of "relayers." These relayers are entities that execute the on-chain actions with high capital efficiency, enabling instant and low-cost transactions.
• DEX Meta-Aggregation: Relay integrates a comprehensive decentralized exchange meta-aggregator that spans its supported networks. This component finds the most efficient trading routes for asset swaps, which is a core part of its bridging and transaction services.

This dual-component system is designed to maintain low gas costs, support rapid expansion to new blockchain networks, and provide a high degree of reliability. ^[1]

The Relay Stack

The protocol's technology is delivered through a three-layered stack, with each layer targeting a different audience.

Relay Protocol

The Relay Protocol is the base layer of the entire system. It functions as the open, underlying network that facilitates communication and execution between users and relayers. This core infrastructure is responsible for powering all products and services built on top of it, ensuring that cross-chain actions are carried out efficiently and securely. ^[1]

Relay API

The Relay API is a product designed for developers, wallets, and marketplaces that need to build multichain applications. It serves as a single integration point that abstracts the underlying complexities of cross-chain development. The API enables features such as instant bridging with predictable fees and seamless swaps through its meta-aggregation capabilities. It is built to support a high-quality user experience by offering functionalities like gas sponsorship, guaranteed exchange rates, and service-level agreements (SLAs) for reliability. ^[1]

Relay App

The Relay App is the user-facing application of the stack. It is designed for end-users who need to perform cross-chain transactions directly. The application allows individuals to swap any token on a supported chain for any other token on another supported chain within a single, unified transaction. For example, a user could swap ETH on the Ethereum network for SOL on the Solana network through the app's interface. ^[1]

Features

The Relay network incorporates several features aimed at providing a reliable and secure user experience for cross-chain transactions.

• Payments-Grade Reliability: The protocol is engineered for high availability, stating a 99.9% uptime across its supported networks. It includes automatic redundancy systems to ensure transactions are completed even if issues arise, and it provides clear completion signals to both applications and end-users.
• Fast Execution: The system is designed to execute transactions quickly, contrasting with the multi-minute wait times often associated with traditional blockchain bridges.
• MEV Protection: The protocol includes built-in protection against Maximal Extractable Value (MEV), a practice where block producers or other network participants can extract value from users by reordering, inserting, or censoring transactions.
• Application Fee Integration: The platform allows developers who integrate the Relay API to add their own application-level fees on top of the protocol's transaction costs.
• Deposit Address Support: The system supports the use of deposit addresses, which can simplify the process of transferring funds for certain types of transactions or integrations.

These features are intended to make the protocol suitable for both individual use and enterprise-level applications that require consistent performance. ^[1]

Use Cases

Relay is designed to support a range of cross-chain activities, serving as a foundational layer for a multichain internet.

• Bridging and Onboarding: The primary use case is facilitating the instant transfer of assets between the 85+ supported blockchain networks. This allows users to move liquidity and onboard into new ecosystems without significant delays.
• Swaps: The protocol supports both same-chain and cross-chain swaps. Users can trade tokens on a single blockchain or execute more complex trades that involve assets on two different chains.
• Call Execution: A more advanced use case is cross-chain call execution. This enables users to pay for a transaction on a destination chain using tokens they hold on a completely different source chain, abstracting the need to hold the destination chain's native gas token.

These capabilities allow developers to build applications where the user does not need to be concerned with which chain their assets are on. ^[1]

Chain Expansion

For companies that help launch new blockchain networks (rollups), Relay provides default payment infrastructure. This allows new rollups to be connected to the broader multichain ecosystem from inception. Partners in this category include:

• Alchemy
• Conduit
• Caldera

Chain Abstraction

In this category, partners use Relay to hide the complexity of cross-chain interactions from their end-users. This creates a more seamless experience where users can interact with assets or applications on different chains without manually bridging funds.

• OpenSea: The NFT marketplace uses Relay to power cross-chain mints, allowing collectors to purchase an NFT on one chain using funds from another.
• Phantom: The multi-chain wallet integrates Relay to simplify complex swap flows for its users, enabling them to trade assets across different networks from within the wallet interface.

Multichain Infrastructure

Other platforms use Relay as a core component of their own multichain infrastructure, routing transaction execution through the protocol.

• OneBalance: This platform leverages Relay to allow its users to access opportunities across different chains without needing to manage assets on each one individually.

These integrations demonstrate the protocol's application in providing foundational rails for an interconnected blockchain environment. ^[1]