n8n-nodes-solana-x402-client

n8n community node for making SOL payments in response to HTTP 402 errors. Client-side implementation of x402 protocol.

🎯 What It Does

• ✅ Parse 402 payment requirements
• ✅ Make SOL payments automatically
• ✅ Return transaction signatures
• ✅ Integrate with any 402-enabled API

📦 Installation

In n8n (Recommended)

1. Go to Settings > Community Nodes
2. Click Install
3. Enter: n8n-nodes-solana-x402-client
4. Click Install

Manual Installation

# 1. Install the package
npm install x402-client-sdk

# 2. Link for development
npm link x402-client-sdk

# 3. Set custom extensions path
export N8N_CUSTOM_EXTENSIONS="$HOME/x402-n8n-nodes"

# 4. Start n8n
n8n start

# 5. In n8n, search for: "Solana x402 Client"
# The node will appear with a Solana icon

🚀 Operations

1. Parse 402 Response

Extracts payment details from 402 response.

Input: 402 response body
Output: Payment details (amount, recipient)

2. Make Payment

Sends SOL to specified address.

Input:

• Recipient address
• Amount (SOL)
• Payment ID (optional)

Output: Transaction signature

3. Parse and Pay ⭐

Parse and pay in one step (recommended!)

Input: 402 response body
Output: Transaction signature

🔐 Credentials

Solana x402 Client API:

• Network: Devnet or Mainnet
• Wallet Private Key: Base58 encoded
• RPC URL: (optional)

Get Private Key:

solana address -k ~/wallet.json
cat ~/wallet.json

📋 Example Workflow

Works with Mock Server node for testing:

Solana x402 (Mock Server) → Returns 402
    ↓
Solana x402 Client → Parse and Pay
    ↓
Solana x402 (Mock Server) → Verify Payment
    ↓
Get Content ✅

Or with real API:

HTTP Request → Get 402 from real API
    ↓
Solana x402 Client → Parse and Pay (sends SOL)
    ↓
HTTP Request → Retry with X-Payment signature
    ↓
Get Content ✅

🎓 Use Cases

Use Case	Description
Testing with Mock	Use with Solana x402 Mock Server node
Auto-pay APIs	Automatic payment on 402
Content Access	Pay for premium content
Subscription	Automated renewal
Pay-per-use	Pay as you go

Perfect combo: Use with the Solana x402 Mock Server node to test complete payment flows in n8n without building APIs!

💰 Wallet Setup

Devnet (Testing):

# Generate wallet
solana-keygen new -o ~/devnet-wallet.json

# Get SOL
solana airdrop 2 YOUR_ADDRESS --url devnet

# Get private key
cat ~/devnet-wallet.json

Mainnet (Production):

• Use existing wallet
• Ensure sufficient SOL balance
• Keep private key secure

🔄 Full Payment Flow

1. Request API
2. Get 402 response
3. Use "Parse and Pay"
4. Get signature
5. Retry request with X-Payment header
6. Access granted ✅

🔒 Security

Best Practices:

• Never commit private keys
• Use environment variables
• Start with small amounts on devnet
• Test thoroughly before mainnet

🐛 Troubleshooting

Issue	Fix
Node not visible	Restart n8n, clear cache
Invalid private key	Use base58 format
Insufficient balance	Get more SOL (airdrop/purchase)
Transaction failed	Check network and balance

🌐 Networks

Devnet:

• Free testing
• Get SOL via airdrop
• Same as mainnet

Mainnet:

• Real SOL
• Purchase from exchange
• Production ready

📚 Resources

• n8n Docs
• Example Workflows
• x402 Protocol

🎯 Requirements

• n8n: v0.220.0+
• Node.js: v18+
• SOL balance for payments

📄 License

MIT

🤝 Contributing

PRs welcome! See CONTRIBUTING.md

💬 Support

• GitHub Issues
• n8n Community

---

⭐ Star if useful!