# MEV Bot - Critical Blockers Summary (QUICK REFERENCE)

## Executive Summary
**Zero profitable executions. System detects opportunities but fails to execute. 10 critical blockers identified.**

---

## 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.

---

## 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**

---

## 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
```

---

## 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

---

## 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)
```

---

## 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 |

---

## 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)

---

## Quick Diagnosis Steps

Run these to verify the blockers:

```bash
# 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)
```

---

## 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

---

## 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

---

**Detailed Analysis:** See `MEV_BOT_COMPREHENSIVE_AUDIT_20251104.md`