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Sei n8n Nodes

Custom n8n nodes for Sei blockchain integration

The n8n-nodes-sei package provides 5 specialized nodes for Sei EVM blockchain operations within n8n workflows.

🎯 Quick Navigation​

🚀 New to n8n? → n8n Service Guide | User Guide
📋 Need Templates? → n8n Templates | Workflow Examples
🔗 Want More Blockchain Tools? → Sei MCP Server | Cambrian DeFi
🛠️ Looking for Setup Help? → Installation Guide | Configuration Guide

Overview​

  • Package: n8n-nodes-sei
  • Version: 0.1.0
  • Installation: Community nodes in n8n or npm
  • Networks: Sei Mainnet (Pacific-1), Testnet (Atlantic-2), Custom EVM chains

📖 Complementary tools: These nodes work alongside Sei MCP Server for complete blockchain integration

Available Nodes​

1. Sei Transaction Builder​

Purpose: Generate transaction data for Sei EVM operations

Operations:

  • Token transfers (SEI and custom tokens)
  • Smart contract method calls
  • Build transaction parameters for execution

Configuration:

  • Network selection (mainnet/testnet/custom)
  • Recipient address and value
  • Contract interaction parameters
  • Gas settings

🔗 Used with: Sei Transaction Executor | Templates using this node

2. Sei Transaction Executor​

Purpose: Execute transactions on Sei EVM

Operations:

  • Execute pre-built transaction data
  • Manual transaction execution
  • Transaction confirmation and receipt

Configuration:

  • Execution mode (from builder or manual)
  • Network and gas parameters
  • Private key credential required

🔗 Used with: Sei Transaction Builder

3. Sei Explorer​

Purpose: Query blockchain data from Sei network

Operations:

  • Get block information
  • Retrieve transaction details
  • Check account balances
  • Call read-only contract methods

Configuration:

  • Query type selection
  • Block number or transaction hash
  • Contract address and ABI for method calls

🔗 Alternative: Sei MCP Server for more advanced blockchain queries

4. Sei Deploy Contract​

Purpose: Deploy smart contracts to Sei or EVM-compatible chains

Operations:

  • Deploy custom contracts (ABI + bytecode)
  • Deploy ERC-20 tokens (name, symbol, decimals, supply)
  • Deploy ERC-721 NFTs (name, symbol)

Configuration:

  • Contract type selection
  • Constructor parameters
  • Network and deployment settings

5. Sei Compile Contract​

Purpose: Compile Solidity source code to bytecode and ABI

Operations:

  • Compile Solidity contracts
  • Built-in ERC-20 and ERC-721 templates
  • Configurable compiler optimization

Configuration:

  • Solidity source code input
  • Compiler version (0.8.19-0.8.24)
  • Optimization settings

🔗 Used with: Sei Deploy Contract

Installation​

Via n8n Community Nodes​

  1. Open n8n: http://localhost:5001
  2. Settings → Community Nodes
  3. Install Package: n8n-nodes-sei
  4. Restart n8n

📖 Detailed guide: n8n Community Nodes Installation

Manual Development Install​

# Clone and build
git clone <repository>
cd n8n-nodes-sei
npm install && npm run build

# Link globally
npm link
cd ~/.n8n/custom
npm link n8n-nodes-sei

Credential Setup​

Create "Sei API" credential in n8n:

  • Type: Sei API
  • Private Key: Your wallet private key (hex format with 0x prefix)

Supported Networks​

  • Sei Mainnet: Pacific-1 (Chain ID: 1329)
  • Sei Testnet: Atlantic-2 (Chain ID: 1328)
  • Custom: Any EVM-compatible chain via RPC URL

🌐 Network details: Sei Network Documentation

Templates​

Integration with Other Services​

🔗 Sei MCP Server Integration​

Combine n8n nodes with MCP server for enhanced functionality:

  • n8n Nodes: Direct blockchain operations
  • MCP Server: Advanced tools and AI integration
  • Use Together: Complex workflows with both approaches

📖 Integration guide: Combining n8n Nodes with MCP Server

🤖 AI Agent Integration​

Use with AI services for intelligent automation:

  • ElizaOS: Conversational triggers for blockchain operations
  • Cambrian: DeFi-focused agent coordination
  • OpenWebUI: Chat-triggered workflows

🔗 AI integration: AI Integration

📊 Database Integration​

Store and analyze blockchain data:

  • PostgreSQL: Transaction history and portfolio data
  • Qdrant: Semantic search of blockchain events
  • Neo4j: Transaction relationship mapping

Error Handling​

Common Issues​

  • Invalid private key: Ensure hex format with 0x prefix
  • Network connectivity: Verify RPC endpoint accessibility
  • Gas estimation: Use appropriate gas limits for operations
  • Contract ABI: Validate ABI format for contract calls

Debugging​

# Check n8n logs
docker logs seiling-n8n

# Verify installation
docker exec seiling-n8n npm list n8n-nodes-sei

Best Practices​

Security​

  • Store private keys securely in n8n credentials
  • Use testnet for development and testing
  • Validate all addresses and transaction parameters

Performance​

  • Use appropriate gas settings for network conditions
  • Implement retry logic for network failures
  • Cache frequently accessed contract data

Development​

  • Test contract compilation before deployment
  • Validate transaction data before execution
  • Monitor transaction confirmations

🔗 Related Resources​

📚 Essential Documentation​

🔗 Blockchain Resources​

🎯 Use Case Examples​

🏦 DeFi Automation​

Nodes Used: All 5 nodes

  • Compile custom DeFi contracts
  • Deploy to Sei network
  • Execute trading strategies
  • Monitor portfolio performance

🎮 NFT Management​

Nodes Used: Compile, Deploy, Explorer

  • Create NFT collections
  • Deploy ERC-721 contracts
  • Track NFT ownership and transfers

📊 Analytics Dashboard​

Nodes Used: Explorer, Database integration

  • Query blockchain data
  • Store in databases
  • Analyze trends and patterns

🚀 Getting Started​

👶 Beginner Path​

  1. Install Nodes - Set up n8n-nodes-sei
  2. Try Templates - Start with pre-built workflows

👨‍💻 Developer Path​

  1. Advanced Workflows - Complex automationservices

The Sei n8n nodes provide a complete smart contract development and interaction workflow within n8n.

Next Steps: