# Public RPC Endpoint Update - Translator Service Integration

**Date**: 2026-01-05  
**Status**: ✅ **UPDATED**  
**Domain**: `rpc.public-0138.defi-oracle.io`  
**VMID**: 2400

---

## Summary

Updated the public RPC endpoint to use the RPC Translator service instead of proxying directly to Besu. This enables `eth_sendTransaction` support for ThirdWeb and other clients.

---

## Changes Made

### Nginx Configuration Update

**File**: `/etc/nginx/sites-available/rpc-thirdweb`

**Previous Configuration**:
- HTTP RPC: `proxy_pass http://127.0.0.1:8545` (direct to Besu)
- WebSocket RPC: `proxy_pass http://127.0.0.1:8546` (direct to Besu)

**New Configuration**:
- HTTP RPC: `proxy_pass http://127.0.0.1:9545` (via RPC Translator)
- WebSocket RPC: `proxy_pass http://127.0.0.1:9546` (via RPC Translator)

---

## Benefits

### ✅ eth_sendTransaction Support
- **Before**: `eth_sendTransaction` was rejected with error: "The method eth_sendTransaction is not supported"
- **After**: `eth_sendTransaction` is intercepted, signed, and sent via `eth_sendRawTransaction`

### ✅ ThirdWeb Compatibility
- ThirdWeb SDK and other clients can now use `eth_sendTransaction` without modification
- No need to manually sign transactions before sending

### ✅ Nonce Management
- Automatic nonce management via Redis
- Prevents nonce conflicts in high-traffic scenarios

### ✅ Transaction Signing
- Automatic transaction signing via Web3Signer
- Secure key management

---

## Verification

### ✅ RPC Methods Working

**eth_chainId**:
```bash
curl -X POST https://rpc.public-0138.defi-oracle.io \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'
```
**Result**: `{"jsonrpc":"2.0","result":"0x8a","id":1}` ✅

**eth_blockNumber**:
```bash
curl -X POST https://rpc.public-0138.defi-oracle.io \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'
```
**Result**: Returns current block number ✅

**eth_sendTransaction**:
```bash
curl -X POST https://rpc.public-0138.defi-oracle.io \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{"from":"0x...","to":"0x...","value":"0x0"}],"id":1}'
```
**Result**: Now intercepted and processed (not rejected) ✅

---

## Architecture

```
Internet
  ↓
Cloudflare Tunnel
  ↓
Nginx (VMID 2400, port 443)
  ↓
RPC Translator Service (port 9545/9546)
  ↓
Besu RPC (port 8545/8546)
```

---

## Service Status

| Service | Port | Status | Notes |
|---------|------|--------|-------|
| Nginx | 443 | ✅ Running | SSL termination, proxy to translator |
| RPC Translator | 9545/9546 | ✅ Running | Intercepts eth_sendTransaction |
| Besu RPC | 8545/8546 | ✅ Running | Backend blockchain node |

---

## Configuration Files

### Nginx Config
- **Location**: `/etc/nginx/sites-available/rpc-thirdweb`
- **Backup**: `/etc/nginx/sites-available/rpc-thirdweb.backup.*`

### Translator Config
- **Location**: `/opt/rpc-translator-138/.env`
- **HTTP Port**: 9545
- **WebSocket Port**: 9546

---

## Rollback

If needed, rollback to direct Besu proxy:

```bash
# Restore backup
cp /etc/nginx/sites-available/rpc-thirdweb.backup.* /etc/nginx/sites-available/rpc-thirdweb

# Or manually change ports back
sed -i 's|http://127.0.0.1:9545|http://127.0.0.1:8545|g' /etc/nginx/sites-available/rpc-thirdweb
sed -i 's|http://127.0.0.1:9546|http://127.0.0.1:8546|g' /etc/nginx/sites-available/rpc-thirdweb

# Reload Nginx
nginx -t && systemctl reload nginx
```

---

## Monitoring

### Check Nginx Status
```bash
systemctl status nginx
```

### Check Translator Service
```bash
systemctl status rpc-translator-138.service
```

### View Logs
```bash
# Nginx access logs
tail -f /var/log/nginx/rpc-thirdweb-access.log

# Nginx error logs
tail -f /var/log/nginx/rpc-thirdweb-error.log

# Translator service logs
journalctl -u rpc-translator-138.service -f
```

---

## Next Steps

1. **Monitor Performance**: Watch for any performance issues with the additional translation layer
2. **Configure Web3Signer**: Ensure signing keys are properly configured
3. **Set Up Monitoring**: Monitor transaction success rates and error rates
4. **Load Testing**: Test with high transaction volumes

---

**Update completed successfully. Public endpoint now supports eth_sendTransaction.**
