NFT Mint Price Watcher

WHAT IT DOES

NFT Mint Price Watcher monitors NFT contract mint prices via on-chain reads and alerts you when the price crosses your configured threshold. It displays real-time price updates, price change percentages, and supply information—all in a clean dashboard. Set alerts for price drops below, rises above, or movement in either direction relative to your threshold. The tool tracks price history within your session (up to 100 readings), showing you how the mint price changes over time. Perfect for monitoring NFT launches, watching for price fluctuations, and catching mint price changes without constantly refreshing.

WHERE IT RUNS

Any webpage with NFT minting activity—NFT marketplaces, project launch pages, mint dashboards, and collector portals. The script automatically detects contract addresses from the page content, or you can paste the address manually. Works with any EVM-compatible chain (Ethereum, Polygon, Arbitrum, Optimism, etc.) as long as your wallet is connected to the correct network.

HOW TO USE

Install the script and navigate to any NFT mint page. Click "Connect Wallet" to link your MetaMask or other EVM wallet. The tool will detect the contract address automatically—verify it. Set your alert threshold in ETH, choose the alert direction (Below, Above, or Either), and set the check interval (default 10 seconds). Click "Start Watching"—the tool checks the contract at your interval and displays real-time price updates. When the price crosses your threshold, you'll see a notification and a flash message in the panel. Use "Check Now" to manually refresh the price. Keyboard shortcut: Ctrl+Shift+W to start/stop watching.

TECHNICAL MECHANISM

The script loads ethers.js v5.7.2 dynamically via a DOM-injected script tag, then creates a Web3Provider from window.ethereum. It builds a contract interface with view functions: price(), mintPrice(), totalSupply(), and maxSupply(). Price reads use eth_call via the provider. The watch loop runs at the user-configured interval (2-60 seconds), fetching the current price and comparing it to the previous value. Price change percentages are calculated from the difference between consecutive readings. The alert system checks the current price against the threshold based on the selected direction (below/above/either). When triggered, a GM_notification is shown and the panel flashes the alert message. A 30-second cooldown prevents repeated alerts for the same price event. Price history is stored in memory (up to 100 readings) for session tracking. No transactions are ever submitted—this tool is read-only.

THE PANEL

The tool runs inside BGPanel, a lightweight UI system built into the BotGentz extension. Drag the panel by its header to reposition it anywhere on screen—it snaps to edges and remembers its position per site. Click the header to collapse the panel into a small bubble; click again to expand. Resize the panel by dragging its bottom-right corner. Press Escape at any time to close the panel. The panel stays out of your way but is always accessible via the extension's toolbar.

PLEASE NOTE

Requires the free BotGentz browser extension and a real EVM wallet extension (MetaMask, Coinbase Wallet, or any wallet that injects window.ethereum). The script supports EVM-compatible chains only. This tool is read-only—no transactions are ever submitted. It cannot detect off-chain price changes, hidden fees, or dynamic pricing mechanisms not exposed via standard view functions. Price reads depend on the contract implementing price() or mintPrice() view functions—some contracts may use different naming. The tool cannot predict future price movements or verify contract source code. Always verify the contract address independently. The script does not store or share any data—all processing happens locally in your browser.