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The Omni Bridge SDK lets you build cross-chain token transfers into your application. It handles the complex parts — address validation, amount encoding, fee calculation — and gives you back unsigned transactions to sign and broadcast however you like.

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What It Does

You tell the SDK where tokens should go. It figures out the rest:
  • Validates addresses across different chain formats
  • Normalizes token amounts between different decimal precisions
  • Encodes transactions for the bridge contracts
  • Calculates fees for relayer-assisted finalization
The SDK is library agnostic. It returns plain transaction objects that work with viem, ethers, @solana/web3.js, near-kit, or whatever signing solution you prefer.

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Supported Chains

EVM

Ethereum, Base, Arbitrum, Polygon, BNB Chain

NEAR

NEAR Protocol

Solana

Solana

Bitcoin

Bitcoin, Zcash

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Packages

Install everything with the umbrella package, or just the chains you need: 
# Everything
npm install @omni-bridge/sdk

# Just EVM chains
npm install @omni-bridge/core @omni-bridge/evm

# Just NEAR
npm install @omni-bridge/core @omni-bridge/near
PackageWhat it’s for
@omni-bridge/coreValidation, types, API client (always needed)
@omni-bridge/evmEthereum, Base, Arbitrum, Polygon, BNB
@omni-bridge/nearNEAR Protocol
@omni-bridge/solanaSolana
@omni-bridge/btcBitcoin, Zcash
@omni-bridge/sdkRe-exports everything

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Next Step

Getting Started

Build your first cross-chain transfer in 5 minutes