Critical fixes applied to resolve 94.4% error rate from RPC rate limiting:
**Configuration Fixes:**
- .env.production: Set Chainstack WSS as primary endpoint
- config/providers_runtime.yaml: Prioritized Chainstack with 100 RPS limits
- config/arbitrum_production.yaml: Increased rate limits from 20 to 100 RPS
**Code Fixes:**
- pkg/scanner/market/scanner.go: Use shared RPC client from contractExecutor
instead of creating new clients for every pool fetch (critical fix)
**Results:**
- Blocks processing continuously without interruption
- DEX transactions being detected and analyzed
- 429 errors reduced from 21,590 (94.4%) to minimal occurrences
- System health restored to production readiness
**Root Cause:**
Scanner was creating new RPC clients for every concurrent pool fetch,
bypassing rate limiting and causing excessive requests to RPC endpoint.
Each goroutine's client made independent requests without coordination.
**Technical Details:**
- Shared client respects global rate limits
- Prevents connection pool exhaustion
- Reduces overhead from repeated connection setup
- Ensures all RPC calls go through rate-limited provider manager
Resolves: LOG_ANALYSIS_20251029.md findings
Impact: Critical - enables continuous block processing
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Added comprehensive bounds checking to prevent buffer overruns in multicall parsing
- Implemented graduated validation system (Strict/Moderate/Permissive) to reduce false positives
- Added LRU caching system for address validation with 10-minute TTL
- Enhanced ABI decoder with missing Universal Router and Arbitrum-specific DEX signatures
- Fixed duplicate function declarations and import conflicts across multiple files
- Added error recovery mechanisms with multiple fallback strategies
- Updated tests to handle new validation behavior for suspicious addresses
- Fixed parser test expectations for improved validation system
- Applied gofmt formatting fixes to ensure code style compliance
- Fixed mutex copying issues in monitoring package by introducing MetricsSnapshot
- Resolved critical security vulnerabilities in heuristic address extraction
- Progress: Updated TODO audit from 10% to 35% complete
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
