n8n-nodes-sei

Custom n8n nodes for Sei blockchain integration.

Features

• Sei Transaction Builder: Build Sei blockchain transactions (token transfers, contract interactions)
• Sei Transaction Executor: Execute Sei blockchain transactions
• Sei Explorer: Query blocks, transactions, balances, and contract calls
• Sei Deploy Contract: Deploy custom, ERC-20, or ERC-721 contracts to Sei or any EVM-compatible chain
• Sei Compile Contract: Compile Solidity source code to bytecode and ABI with built-in templates
• Support for Sei Mainnet, Testnet, and custom networks
• Token transfers, smart contract interactions, contract deployment and compilation

Installation

Prerequisites

• Node.js 18.10 or higher
• npm or pnpm
• n8n installed globally

Install from npm (when published)

npm install n8n-nodes-sei

Install for local development

1. Clone this repository
2. Install dependencies:

   npm install

3. Build the project:

   npm run build

4. Link the package:

   npm link

5. Link to your n8n installation:

   cd ~/.n8n/custom  # or your custom n8n directory
   npm link n8n-nodes-sei

Usage

Setting up Credentials

1. In n8n, go to Settings > Credentials
2. Add new credential of type "Sei API"
3. Enter your wallet private key (hex format)

Using the Nodes

Sei Transaction Builder

• Build transactions for token transfers or contract interactions
• Returns transaction data that can be used with the executor

Sei Transaction Executor

• Execute transactions on the Sei blockchain
• Requires transaction data from the builder or manual input

Sei Explorer

• Query block info, transaction details, account balances, or call contract methods
• Supports custom RPC and all EVM-compatible chains

Sei Deploy Contract

• Deploy a smart contract to Sei or any EVM-compatible chain
• Supports three contract types:
  • Custom: Paste ABI and bytecode, enter constructor arguments
  • ERC-20: Fill in token name, symbol, decimals, initial supply
  • ERC-721: Fill in collection name, symbol
• Network selection: Sei Mainnet, Testnet, or custom RPC
• Uses the same credential as other Sei nodes
• Outputs deployed contract address and transaction hash

Sei Compile Contract

• Compile Solidity source code to bytecode and ABI
• Features:
  • Solidity Compiler: Built-in compiler with version selection (0.8.19-0.8.24)
  • Optimization: Configurable compiler optimization settings
  • Template Support: Use built-in ERC-20 and ERC-721 contract templates
  • Error Handling: Comprehensive compilation error and warning reporting
  • Output Format: Produces bytecode and ABI ready for deployment
• Perfect for complete smart contract workflow: Write → Compile → Deploy → Interact

Networks Supported

• Sei Mainnet (Pacific-1)
• Sei Testnet (Atlantic-2)
• Custom networks via RPC URL (any EVM chain)

Development

Building

npm run build

Linting

npm run lint

Testing locally

npm run dev  # Watch mode

License

MIT License