Gas Price Chart Overlay

WHAT IT DOES

Gas Price Chart Overlay is a powerful transaction optimization tool that displays real-time gas price charts with historical trends, forecasts, and priority cost estimates directly on any webpage. When you're browsing any site with blockchain transaction activity, the tool automatically starts collecting gas price data from your connected wallet's RPC endpoint via eth_gasPrice calls, building a rolling history of gas prices over time. The panel displays a line chart showing gas price trends over the past hour, day, or week (configurable), with the current gas price highlighted alongside recent highs and lows. It provides visual indicators for optimal transaction timing, showing the best time to execute transactions in the last 24 hours. The tool also offers gas price forecasts based on historical patterns and current trends, estimated transaction costs at different priority levels (Slow, Standard, Fast), and cost estimates for common transaction types (token transfers, swaps, NFT mints, approvals). All data is stored locally, giving you a complete view of gas price patterns to save money on transaction fees.

WHERE IT RUNS

This overlay operates on any website (matching all URLs) across the entire web. It works in any browser that supports the BotGentz extension framework and has an EVM-compatible wallet extension installed. The panel automatically activates whenever you're on a page and starts collecting and displaying gas price data for your current chain.

HOW TO USE

Install the extension and connect your wallet. The tool automatically begins collecting gas price data from your wallet's RPC endpoint at the configured interval. The panel displays a real-time gas price chart with historical trends, current price, statistics (avg, min, max, median), optimal timing indicator, and forecast. Configure your settings: select the chart time range (1 hour, 6 hours, 24 hours, 7 days), set the data collection interval (10 seconds to 5 minutes), choose your display mode (line or bar chart), and set a gas price alert threshold to receive notifications when gas drops below a certain level. The panel also shows priority cost estimates (Slow, Standard, Fast) and estimated transaction costs for common operations. Use the "Refresh Chart" button to manually update data, "Clear History" to reset your local data, and "Save Settings" to apply your preferences.

MECHANISM: REAL-TIME GAS PRICE DATA COLLECTION WITH LOCAL HISTORY AND FORECASTING

The extension implements a continuous gas price monitoring system that builds a local historical database of gas prices using GM_setValue. Every 10-300 seconds (user-configurable), the tool calls eth_gasPrice via the connected wallet's RPC endpoint, captures the current gas price in Gwei, and appends it to the local history array along with the chain ID and timestamp. The data is stored with a maximum of 1,000 data points (configurable), automatically purging old entries to manage storage size. The chart rendering uses a simple coordinate-based visualization that plots gas price over time, with the x-axis representing time and the y-axis representing gas price in Gwei. The statistics calculation computes average, min, max, median, current percentile, and data point count. The optimal timing indicator finds the lowest gas price within the displayed time window. The forecasting algorithm uses a weighted moving average of the last 10 data points with a 30% trend factor to project the next likely gas price. The priority cost estimates apply different multipliers (0.9x for Slow, 1.0x for Standard, 1.2x for Fast) to the current gas price, while the transaction cost estimates multiply the current gas price by typical gas limits for common operations (21,000 for transfers, 65,000 for ERC-20 transfers, 150,000 for swaps, 100,000 for NFT mints, 45,000 for approvals). All data is stored locally in the browser—no external servers or third-party APIs are used beyond the wallet's RPC endpoint.

THE PANEL

The overlay panel is fully draggable via its title bar and remembers its position per-site using GM_setValue. It snaps to the nearest edge when dragged within 40px of any screen boundary. The panel includes clear sections for gas price chart (chain name, wallet address, current gas price with level indicator), statistics (average, min, max, median, percentile, data points), optimal timing (best time in the last 24 hours), forecast (projected gas price with trend direction), priority costs (Slow, Standard, Fast with Gwei values), estimated transaction costs (transfer, ERC-20 transfer, swap, NFT mint, approval), alert section (shows when gas is below threshold), settings (time range selector, data interval selector, display mode selector, alert threshold input, notification toggle), and action buttons (Refresh Chart, Clear History, Save Settings). The chart displays gas price trends with clear visual markers for current price, highs, and lows. Pressing Escape temporarily dismisses the panel until you navigate to a new page or manually reactivate.

PLEASE NOTE

This extension requires the free BotGentz framework extension to be installed and active. You must also have a real EVM-compatible wallet extension (such as MetaMask, WalletConnect, Coinbase Wallet, or Rabby) already installed in your browser—the overlay uses your wallet's RPC provider for eth_gasPrice calls and chain detection. This tool is read-only—it does not send transactions or modify gas settings; it only displays gas price data and forecasts. The tool cannot predict future gas prices with certainty (forecasts are estimates based on historical patterns); depends on the wallet's RPC endpoint which may be rate-limited or unavailable; cannot fetch gas price history from before the tool was installed; data is stored locally and may be lost if storage is cleared; does not support chains where gas price mechanics differ significantly from Ethereum's fee market; cannot account for gas price fluctuations caused by major network events or surges; does not support non-EVM chains where gas calculation methods differ; and cannot provide accurate gas price data if the user switches chains without refreshing the panel. No private keys, wallet balances, browsing history, or transaction data are ever collected, transmitted, or stored outside your local browser—all data is stored locally using GM_setValue.