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Interop SDK

The Interop SDK is a TypeScript library for cross-chain applications. It aims to bring the latest standards and interop best practices to wallet and app developers who want to provide their users with seamless multichain experiences.

Core Modules​

addresses​

The addresses module provides tools to work with interoperable addresses —a format designed to encode a recipient, a chain, and optionally a domain name (e.g., alice.eth@eip155:1).

This is a reference implementation for EIP-7930, ERC-7828, and CAIP-350, the standards behind interoperable addresses

The module follows a clean two-layer architecture:

  1. Address Layer (EIP-7930 + CAIP-350): Discriminated union address representation (binary or text) - synchronous encoding/decoding with automatic conversion between representations
  2. Name Layer (ERC-7828): Human-readable names with ENS resolution - async operations

It includes utilities to:

  • Parse interoperable names (e.g., vitalik.eth@eip155:1#4CA88C9C)
  • Convert between name, address (binary or text representation), and binary serialized formats
  • Resolve ENS names to target addresses on supported chains
  • Validate checksums and chain references
  • Extract address and chain ID components from any format

This module standardizes how applications handle multi-chain addressing and ensures compatibility across chains and identity systems.

cross-chain​

🚧 This package is currently under development 🚧

The cross-chain module is responsible for managing the intent workflow: from user input to executable transfer strategies.

It includes logic to:

  • Parse and validate user-defined transfer intents (e.g., "Send 100 USDC to bob.eth@oeth")
  • Fetch quotes from cross-chain providers
  • Simulate gas, slippage, execution costs, and fallback routes
  • Track intent status from initiation to completion
  • Aggregate and compare quotes from multiple providers

This module acts as a routing engine and aggregator, designed to support declarative preferences while keeping users in control of execution.

Wallets and Apps Integration​

The Interop SDK is designed to be embedded into:

  • Wallets that want to offer native cross-chain transfers
  • Payment UIs or checkout flows with multichain support
  • Cross-chain bots, agents, or automation systems
  • Any app that wants to offer seamless multichain experiences

Developers remain in control of what chains, protocols, and assets to support through configuration and whitelisting.