mev-beta/docs/BLOCKERS_SUMMARY.md

MEV Bot - Critical Blockers Summary (QUICK REFERENCE)

Executive Summary

Zero profitable executions. System detects opportunities but fails to execute. 10 critical blockers identified.

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The Problem In One Sentence

Token amounts extracted from swap events are ZERO, causing profit rejection for all opportunities before they reach the execution layer.

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10 CRITICAL BLOCKERS

#	Blocker	Impact	Location	Fix Time
1	Zero Amount Detection	Blocks 95%+ of opportunities	pkg/profitcalc/profit_calc.go:104-134	2-4h
2	Token Graph Empty	No arbitrage paths found	pkg/arbitrage/multihop.go:167-173	1-2h
3	BatchFetch Contract Reverts	Cannot get pool state	pkg/scanner/market/scanner.go:139-142	2-3h
4	Invalid Profit Margins	Extreme negative values (-330K%)	pkg/profitcalc/profit_calc.go:261-294	1h
5	Unknown Token Filtering	95% tokens cannot be priced	pkg/profitcalc/profit_calc.go:152-161	2-3h
6	Execution Disconnected	Opportunities never execute	pkg/arbitrage/service.go	2-3h
7	Profit Threshold Too High	Rejects valid opportunities	pkg/arbitrage/detection_engine.go:188	1h
8	BatchFetch Contract Wrong	RPC rate limits hit	pkg/datafetcher/batch_fetcher.go	2-3h
9	No Executor Integration	Flash loans never trigger	pkg/arbitrage/executor.go	2-3h
10	Parser Zero Amounts	Swap events lose data	pkg/events/parser.go	2-4h

Total Fix Time: 8-14 hours

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Root Cause Chain

1. Event Parser Extracts ZERO amounts
   ↓
2. Profit Calculator Receives ZERO values
   ↓
3. Profit Margin = negative / 0 = EXTREME VALUE
   ↓
4. Bounds Check Rejects (< -1.0)
   ↓
5. Marked: isExecutable = false
   ↓
6. Execution Loop Never Triggered
   ↓
Result: ZERO PROFITS, ZERO EXECUTIONS

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Most Critical Fixes (Priority Order)

FIX #1: Event Parser (2-4 hours)

File: pkg/events/parser.go or pkg/arbitrum/parser/core.go Problem: Swap event amounts are extracted as ZERO Solution:

• Validate event signature matching
• Fix decimal handling in amount conversion
• Test with real Arbitrum swap transactions

FIX #2: Token Graph (1-2 hours)

File: pkg/arbitrage/multihop.go:522-594 Problem: Token graph has only 8 hardcoded pools with placeholder data Solution:

• Link 314 cached pools to token graph
• Implement pool discovery loop
• Verify minimum 20 tokens, 50 pools

FIX #3: Execution Pipeline (2-3 hours)

File: pkg/arbitrage/service.go Problem: Detected opportunities are never executed Solution:

• Connect opportunity forwarder to executor
• Implement execution goroutine
• Add transaction monitoring

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Evidence From Logs

Zero Amounts in Opportunities

2025/11/02 15:22:33 [OPPORTUNITY] Amount In: 0.000000 tokens
                                   Amount Out: 0.000000 tokens

Automatic Rejection

rejectReason:negative profit after gas and slippage costs
profitMargin:-330178.9776420681  (EXTREME NEGATIVE)

Zero Execution Stats

2025/11/02 15:22:38 [INFO] Arbitrage Service Stats
    Detected: 0
    Executed: 0
    Successful: 0
    Success Rate: 0.00%
    Total Profit: 0.000000 ETH

BatchFetch Failures

2025/11/02 15:22:49 [WARN] Failed to fetch batch 0-1: execution reverted
(repeated 25+ times)

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System Status

Component	Status	Evidence
Detection Engine	✅ WORKING	Detects multiple opportunities/minute
Amount Extraction	❌ BROKEN	All amounts = 0.000000
Profit Calculation	❌ BROKEN	Uses invalid amounts
Execution Pipeline	❌ DISCONNECTED	No executor calls
Token Graph	❌ INCOMPLETE	8 hardcoded pools only
Pool State Fetch	❌ FAILING	BatchFetch contract reverts

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What Works vs What Doesn't

What's Working ✅

• RPC connection to Arbitrum
• Event monitoring and parsing (structure is correct)
• Opportunity detection (finds swaps correctly)
• Pool caching (314 pools cached)
• Key generation and wallet setup

What's Broken ❌

• Token amount extraction (shows as 0.000000)
• Profit margin calculation (extreme values)
• Token graph initialization (empty/incomplete)
• Batch pool data fetching (contract calls fail)
• Execution connection (never triggered)
• Flash executor integration (dormant)

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Quick Diagnosis Steps

Run these to verify the blockers:

# 1. Check event parser is extracting zero amounts
grep "Amount In: 0.000000" logs/mev_bot.log | wc -l
# Expected: 50+ (confirms Blocker #1)

# 2. Check token graph connectivity
grep "has no adjacent tokens" logs/mev_bot.log
# Expected: Found (confirms Blocker #2)

# 3. Check batch fetcher failures
grep "batch fetch V3 data failed" logs/mev_bot.log | wc -l
# Expected: 20+ (confirms Blocker #3)

# 4. Check zero executions
grep "Executed: 0" logs/mev_bot.log | wc -l
# Expected: All recent stats (confirms Blocker #6)

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Expected Outcome After Fixes

After fixing blockers #1-2 (4-6 hours):

• Token amounts extracted correctly
• Token graph has 20+ tokens with 50+ pools
• Profit calculator receives valid amounts
• 50%+ of opportunities marked as executable

After fixing blocker #6 (2-3 hours):

• Execution pipeline triggers for valid opportunities
• First profitable trade executes
• System achieves positive P&L

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Next Steps

1. DEBUG: Add logging to event parser to verify amount extraction
2. FIX: Correct the amount extraction logic in parser
3. VALIDATE: Confirm profit calculations use non-zero amounts
4. CONNECT: Wire opportunity detection to execution pipeline
5. TEST: Execute first successful arbitrage trade

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Detailed Analysis: See MEV_BOT_COMPREHENSIVE_AUDIT_20251104.md