mev-beta/docs/LOG_ERROR_ANALYSIS_20251102.md

MEV Bot Log Error Analysis Report

Generated: 2025-11-02 21:45:00

📊 Executive Summary

Health Score: 93.61/100 (Concerning)

• Error Rate: 6.39% (13,675 errors in 213,863 lines)
• Success Rate: 0.64% (1,386 successes - Very Low)
• Warning Lines: 100,743 (47.1% of logs)
• Recent Health Trend: Concerning

🚨 Critical Issues Identified

1. ❌ Pool Token Fetch Failures (High Frequency)

Pattern: Failed to get tokens for pool: failed to call token1(): execution reverted

• Frequency: Continuous, multiple failures per minute
• Impact: Unable to fetch pool data for arbitrage calculations
• Affected Pools:
  • 0x6f38e884725a116C9C7fBF208e79FE8828a2595F (most frequent)
  • 0xB1026b8e7276e7AC75410F1fcbbe21796e8f7526
  • 0xC6962004f452bE9203591991D15f6b388e09E8D0
  • 0xcDa53B1F66614552F834cEeF361A8D12a0B8DaD8
  • Multiple other UniswapV3 pools

Root Cause: These pools appear to be:

1. Non-standard implementations without standard token0/token1 methods
2. Possibly malicious or honeypot contracts
3. Deprecated/migrated pools

2. 🔴 DNS/Connection Failures

Pattern: Temporary failure in name resolution for arb1.arbitrum.io

• Time Period: 21:39:19 - 21:40:46 (continuous)
• Frequency: Every 3 seconds for ~90 seconds
• Impact: Complete loss of RPC connectivity
• Root Cause: DNS resolution failure, possibly network issue or DNS server problem

3. ⚠️ Zero Amount Issues

Pattern: All detected opportunities show:

• Amount In: 0.000000 tokens OR Amount Out: 0.000000 tokens
• Frequency: 215+ occurrences in recent logs
• Impact: Cannot execute any trades due to zero amounts
• All opportunities marked: isExecutable: false
• Rejection Reason: "negative profit after gas and slippage costs"

4. 📉 Profit Calculation Inconsistencies

Key Findings:

• ALL opportunities detected show negative profit
• estimatedProfitETH: 0.000000 for all opportunities
• netProfitETH: -0.000007 to -0.000009 (always negative)
• Profit margins range from: -3.68e-11 to -1.38e+07 (extremely negative)
• Price impact calculations: Extremely small values (e-15 to e-31 range)

5. 🔧 Batch Fetch Failures

Pattern: Failed to fetch batch 0-1: batch fetch V3 data failed: execution reverted

• Time: 20:53:48 - 20:53:50
• Frequency: 20+ failures in 2 seconds
• Impact: Unable to fetch pool data in batches, falling back to individual calls

📈 MEV Metrics Analysis

Detection Statistics:

• Opportunities Detected: 263 (last analysis)
• Events Rejected: 0 (concerning - should have some rejections)
• Parsing Failures: 0 (good)
• Direct Parsing Attempts: 0 (concerning)
• Blocks Processed: 28,712
• DEX Transactions: 60,166
• Success Rate: 0.64% (extremely low)

Opportunity Analysis:

From the 50 recent opportunities analyzed:

• 100% marked as non-executable
• 100% show negative profit after gas
• Common tokens involved: USDC, WETH, USDT, LINK
• Protocols: Primarily UniswapV3
• Confidence levels: All at 0.1 (10% - very low)

🔍 Root Cause Analysis

1. Systematic Calculation Error

The bot appears to have a fundamental issue in profit calculation:

• All opportunities show zero or near-zero estimated profit
• Gas costs always exceed profit (7-9 gwei estimated)
• Price impact calculations are orders of magnitude too small

2. Amount Extraction Issues

The zero amounts suggest problems in:

• ABI decoding of swap transactions
• Amount calculation from raw transaction data
• Token decimal handling

3. Pool Data Quality Issues

Many pools returning errors suggest:

• Need for pool validation/blacklisting
• Incorrect pool detection logic
• Missing handling for non-standard pools

4. Network Connectivity

DNS failures indicate:

• Need for multiple RPC endpoints
• Better failover handling
• DNS caching or direct IP usage

🛠 Recommended Fixes

Immediate Actions:

1. Fix Amount Extraction:

   • Review ABI decoder logic for amount parsing
   • Check decimal handling in swap analysis
   • Add validation for non-zero amounts

2. Implement Pool Blacklist:

   • Create blacklist for failing pools
   • Skip pools that consistently fail token fetch
   • Add pool validation before attempting to fetch

3. Fix Profit Calculations:

   • Review profit calculation formula
   • Check gas price estimation
   • Validate price impact calculations
   • Consider removing minimum profit threshold temporarily for debugging

4. Improve RPC Resilience:

   • Add multiple RPC endpoints
   • Implement proper failover
   • Consider using direct IPs vs DNS
   • Add connection health monitoring

Configuration Changes:

# Suggested config updates
profit_threshold: 0.00001  # Lower from current (appears too high)
gas_price_multiplier: 0.8  # Reduce gas estimation
confidence_threshold: 0.05  # Lower from 0.1
enable_pool_blacklist: true
max_pool_fetch_retries: 1  # Don't retry failing pools

📋 Action Items Priority

1. CRITICAL: Fix zero amount extraction issue
2. CRITICAL: Correct profit calculation logic
3. HIGH: Implement pool blacklisting
4. HIGH: Add RPC failover endpoints
5. MEDIUM: Optimize gas estimation
6. MEDIUM: Improve error handling and logging
7. LOW: Add monitoring dashboards

🎯 Success Criteria

After fixes, we should see:

• Non-zero amounts in detected opportunities
• At least 5-10% of opportunities marked as executable
• Positive profit calculations for some opportunities
• Reduced pool fetch errors (<100 per hour)
• Zero DNS/connection failures with failover
• Health score > 95/100

📝 Conclusion

The MEV bot is currently non-functional for executing trades due to critical issues in:

1. Amount extraction (all zeros)
2. Profit calculations (all negative)
3. Pool data fetching (many failures)
4. Network connectivity (DNS issues)

These issues must be addressed immediately to restore functionality. The bot is detecting opportunities but cannot execute any due to the calculation errors.