Sei Bridging Tooling

Tooling for bridging tokens and NFTs between Sei and other EVM chains (Ethereum, BSC, and more) using industry-standard cross-chain protocols.

What's Inside

Directory	Protocol	Asset Type	Description
layerzero-oft/	LayerZero V2	Fungible Tokens (ERC-20)	Bridge tokens using Omnichain Fungible Token (OFT) standard
layerzero-nft/	LayerZero V2	NFTs (ERC-721)	Bridge NFTs using Omnichain Non-Fungible Token (ONFT721) standard
wormhole-ntt/	Wormhole NTT	Fungible Tokens (ERC-20)	Bridge tokens using Wormhole Native Token Transfers

Choosing a Bridge

By asset type

• Fungible tokens (ERC-20) → layerzero-oft/ or wormhole-ntt/
• NFTs (ERC-721) → layerzero-nft/

By scenario

I want to...	Go to
Launch a new token that works across chains	layerzero-oft/oft-token
Bridge an existing ERC-20 from Sei to other chains	layerzero-oft/oft-adapter or wormhole-ntt/
Launch a new NFT collection that works across chains	layerzero-nft/onft-token
Bridge an existing ERC-721 to Sei from another chain	layerzero-nft/onft-adapter
Use Wormhole's guardian-relayed token transfers	wormhole-ntt/

Project Structure

sei-bridging-tooling/
│
├── layerzero-oft/                  ← Token bridging via LayerZero V2
│   ├── oft-token/                     New omnichain token (burn/mint)
│   ├── oft-adapter/                   Wrap existing ERC-20 (lock/unlock)
│   └── README.md
│
├── layerzero-nft/                  ← NFT bridging via LayerZero V2
│   ├── onft-token/                    New omnichain NFT (burn/mint)
│   ├── onft-adapter/                  Wrap existing ERC-721 (lock/unlock)
│   └── README.md
│
├── wormhole-ntt/                   ← Token bridging via Wormhole NTT
│   ├── example-ntt-token-evm/         EVM token + NTT setup
│   ├── demo-ntt-ts-sdk/               TypeScript SDK demo
│   ├── my-ntt-project/                Starter project
│   └── README.md
│
└── README.md                       ← You are here

Supported Chains

All projects support the following chains out of the box:

Chain	Mainnet	Testnet
Sei	Sei mainnet (1329)	Sei testnet (1328)
Ethereum	Mainnet (1)	Sepolia (11155111)
BSC	BSC mainnet (56)	BSC testnet (97)

Adding more chains is straightforward — each project's README explains how.

Getting Started

1. Pick the directory that matches your use case from the table above
2. Open its README.md for a step-by-step walkthrough
3. Each sub-project is self-contained with its own package.json, contracts, deploy scripts, and interaction scripts

Every README follows the same flow: install → configure .env → compile → deploy → set peers → bridge → track on explorer.

Prerequisites

• Node.js >= 18
• A funded wallet on the chains you want to bridge between