Mempool Real-Time Live Tracker

A smart contract for the Stacks blockchain that provides real-time mempool tracking, fee recommendations, and transaction management capabilities.

Overview

This smart contract enables real-time monitoring of the Stacks blockchain mempool, offering features such as:

• Transaction tracking and status management
• User watchlist functionality
• Fee statistics and recommendations
• Real-time mempool metrics
• Configurable fee thresholds

Features

Transaction Tracking

• Track individual transactions with detailed metadata
• Monitor transaction status (confirmed/unconfirmed)
• Calculate transaction priorities based on fee rates and sizes
• Estimate confirmation times based on network congestion

User Watchlists

• Create and manage personal transaction watchlists
• Set custom alert thresholds
• Enable/disable notifications
• Support for up to 100 transactions per watchlist

Fee Statistics

• Track average, minimum, and maximum fee rates
• Provide fee recommendations for different priority levels (low, medium, high)
• Historical fee data storage by block height

Mempool Metrics

• Monitor mempool size and transaction count
• Track average confirmation times
• Calculate network congestion levels
• Real-time updates of mempool statistics

Technical Specifications

Constants

• Maximum transaction size: 1MB
• Maximum fee rate: 1,000,000
• Minimum fee rate: 1
• Maximum congestion level: 100
• Maximum confirmation time: 2 hours (7200 seconds)

Data Structures

Tracked Transactions

{
    fee-rate: uint,
    size: uint,
    priority: uint,
    timestamp: uint,
    confirmed: bool,
    category: string-ascii,
    prediction: uint
}

User Watchlists

{
    tx-ids: (list 100 string-ascii),
    alert-threshold: uint,
    notifications-enabled: bool
}

Fee Statistics

{
    avg-fee: uint,
    min-fee: uint,
    max-fee: uint,
    recommended-low: uint,
    recommended-medium: uint,
    recommended-high: uint,
    total-tx-count: uint
}

Mempool Metrics

{
    size: uint,
    tx-count: uint,
    avg-confirmation-time: uint,
    congestion-level: uint
}

Public Functions

Transaction Management

• track-transaction: Add a new transaction to tracking
• update-transaction-status: Update confirmation status of a transaction
• get-transaction-details: Retrieve details of a tracked transaction

Watchlist Management

• add-to-watchlist: Add transaction to user's watchlist
• get-user-watchlist: Retrieve user's watchlist

Statistics and Metrics

• update-fee-statistics: Update block-height based fee statistics
• update-mempool-metrics: Update real-time mempool metrics
• get-fee-statistics: Retrieve fee statistics for a specific block height

Administrative Functions

• set-min-fee-threshold: Update minimum fee threshold
• transfer-ownership: Transfer contract ownership

Error Codes

Code	Description
1000	Not authorized
1001	Invalid parameters
1002	Not found
1003	Already exists
1004	Invalid fee
1005	Invalid size
1006	Invalid threshold
1007	Invalid stats
1008	Invalid metrics
1009	Invalid category
1010	Invalid transaction ID
1011	Invalid user
1012	Invalid height
1013	Invalid owner

Security Features

• Owner-only administrative functions
• Comprehensive input validation
• Threshold-based fee validation
• Transaction ID format verification
• Size and rate limitations

Installation and Usage

1. Deploy the contract to the Stacks blockchain
2. Initialize with appropriate minimum fee threshold
3. Begin tracking transactions and updating mempool metrics
4. Monitor fee statistics and transaction statuses
5. Set up user watchlists as needed

Security Considerations

• Only contract owner can update critical metrics
• All inputs are validated before processing
• Transaction IDs must be valid 64-character hex strings
• Fee rates must fall within acceptable ranges
• Size limitations prevent resource exhaustion