RelAI is a hosted facilitator service that simplifies x402 payment processing on SKALE Network. Instead of running your own facilitator infrastructure, you can use RelAI’s SDK to handle payment verification and settlement across multiple tokens.
Highlights
The RelAI facilitator has enabled BITE transactions for both SKALE Base and SKALE Base Sepolia.
What does this mean?
- When a merchant settles any x402 transaction through RelAI facilitator it gets automatically encrypted through BITE and only decrypted at the consensus level
For more inforamtion around BITE please check here.
Prerequisites
- Node.js and npm installed
- A wallet on SKALE Base or SKALE Base Sepolia
- Basic understanding of x402 protocol
Configuration
Environment Variables
Create a .env file with RelAI configuration:
# Your wallet address to receive payments
PAYMENT_RECEIVER_ADDRESS=0xYourWalletAddressHere
# Private key for client (NEVER commit this!)
PRIVATE_KEY=0xYourPrivateKeyHere
# Server port
PORT=3000
# Price for premium endpoint (in USD)
PREMIUM_PRICE=0.01
Supported Networks and Tokens
RelAI supports the following SKALE networks:
| Network | Tokens |
|---|
| SKALE Base Sepolia | USDC, USDT, ETH, SKL, WBTC |
| SKALE Base | USDC, USDT, ETH, SKL, WBTC |
Integration with RelAI
Make sure to install the RelAI SDK:
npm install @relai-fi/x402
Server Setup
Client Setup
import express from 'express';
import cors from 'cors';
import dotenv from 'dotenv';
import Relai from '@relai-fi/x402/server';
dotenv.config();
const app = express();
const PORT = process.env.PORT || 3000;
// Middleware
app.use(cors());
app.use(express.json());
// Initialize RelAI SDK for SKALE Base Sepolia
const relai = new Relai({
network: 'skale-base-sepolia',
facilitatorUrl: 'https://facilitator.x402.fi'
});
// Public endpoint - no payment required
app.get('/api/public', (req, res) => {
res.json({
message: 'This is a public endpoint - no payment required',
network: 'SKALE Base Sepolia'
});
});
// Premium endpoint - protected by x402 payment
app.get(
'/api/premium',
relai.protect({
payTo: process.env.PAYMENT_RECEIVER_ADDRESS!,
price: parseFloat(process.env.PREMIUM_PRICE || '0.01'),
}),
(req, res) => {
// Payment is automatically verified by the middleware
// req.payment contains the payment details
res.json({
success: true,
message: 'Premium data unlocked via RelAI!',
payment: req.payment
});
}
);
// Start server
app.listen(PORT, () => {
console.log(`Server running on http://localhost:${PORT}`);
});
import dotenv from 'dotenv';
import { createX402Client } from '@relai-fi/x402/client';
import { privateKeyToAccount } from 'viem/accounts';
dotenv.config();
async function main() {
const SERVER_URL = process.env.SERVER_URL || 'http://localhost:3000';
// Create account from private key
const privateKey = process.env.PRIVATE_KEY as `0x${string}`;
const account = privateKeyToAccount(privateKey);
// Create x402 client with RelAI
const client = createX402Client({
wallets: {
evm: {
address: account.address,
signTypedData: (params) =>
account.signTypedData(params as any),
},
},
});
// Access RelAI-protected resource
const response = await client.fetch(`${SERVER_URL}/api/premium`);
if (response.ok) {
const data = await response.json();
console.log('Data received:', data);
}
}
main().catch(console.error);
Troubleshooting
Connection Issues
If you cannot connect to RelAI:
- Verify the facilitator URL is correct
- Check network connectivity
- Ensure your wallet has tokens for gas fees
- Review firewall settings
Payment Failures
Common causes and solutions:
| Issue | Solution |
|---|
| Invalid signature | Verify wallet configuration and signing |
| Insufficient balance | Ensure payer has enough tokens |
| Network mismatch | Check network matches configuration |
| Invalid receiver | Verify PAYMENT_RECEIVER_ADDRESS is correct |
Next Steps
Resources
This entity — RelAI — is deployed and actively supporting SKALE. These are 3rd party services that may have their own terms and conditions and privacy policies. Use these services at your own risk. AI and agents is a highly experimental space; the 3rd party software solutions may have bugs or be unaudited. You and your agents and your customers use all 3rd party services chosen at your own risk and per their terms.
