450ms payment simulator

[1evi7eo]

Description

Adds a crypto payment simulator demonstrating BNB Chain's Fermi upgrade with 450ms block times and sub-second transaction finality.

This example:

• Shows real-time payment processing with timing metrics
• Demonstrates Fermi's 450ms block time and ~1.125s fast finality
• Provides an interactive web frontend for testing payments
• Includes MCP integration for AI agent interactions
• Measures actual vs theoretical confirmation times

Motivation: Showcase BNB Chain's performance improvements from the Fermi hard fork, which reduced block times from 750ms to 450ms, enabling sub-second transaction finality.

Type of change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Unit tests: pytest test_payment_simulator.py -v — all 9 tests pass
• Manual testing:
  • Started server with ./run.sh
  • Verified frontend loads at http://localhost:5000
  • Sent test payments and verified timing metrics
  • Checked transaction history display
  • Verified network statistics display
• Integration testing:
  • Tested MCP tool integration (send_payment, get_payment_history, get_balance, get_network_stats)
  • Verified virtual environment setup and dependency installation
  • Confirmed error handling for invalid addresses and amounts

Test coverage includes:

• Payment submission with timing metrics
• Balance checking
• Transaction history retrieval
• Network statistics
• Error handling for edge cases

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

• Includes interactive frontend with real-time transaction monitoring
• Demonstrates Fermi upgrade benefits with actual timing measurements
• Full MCP protocol support for AI agent integration
• Comprehensive README with demo examples and usage instructions
• Virtual environment setup script for easy deployment
• All dependencies documented in requirements.txt

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[1evi7eo]

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Thank you for the opportunity to contribute!
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