Gas Fee Tracker

WHAT IT DOES

The Gas Fee Tracker is a read-only analytics tool that monitors current gas prices and helps you estimate transaction costs. It displays the current gas price in Gwei, the EIP-1559 base fee (if supported), a suggested priority fee, and a calculated max fee per gas. The tool also shows a gas price trend indicator (rising, falling, or stable) based on recent historical data, the latest block number, and a timestamp. You can enter a custom gas limit to estimate the total cost of a transaction in ETH and approximate USD. The app supports auto-refresh every 15 seconds, giving you a real-time view of network conditions before you send a transaction.

HOW TO USE

1. Select your network from the dropdown or connect your wallet to use its RPC endpoint.

2. Click "Refresh gas data" to fetch the current gas prices and block data.

3. Review the gas statistics: current gas price, base fee, suggested priority fee, max fee per gas, trend, last block, and last update time.

4. Enter a gas limit (e.g., 21000 for a standard ETH transfer, or a custom value for contract interactions) in the "Transaction cost estimates" section.

5. Click "Estimate cost" to see the estimated transaction cost in ETH and approximate USD.

6. Enable "Auto-refresh every 15 seconds" to keep the data updated automatically.

ONE TECHNICAL SECTION

This tool uses ethers v5's provider methods to fetch gas data. The primary method is provider.getGasPrice(), which returns the current gas price in wei. For EIP-1559 chains, the tool also fetches the latest block via provider.getBlock('latest') to extract the baseFeePerGas field. The suggested priority fee is calculated using a simple heuristic: priority fee = gas price - base fee, clamped to a reasonable range (0.5 to 5 Gwei). The max fee per gas is then computed as (base fee * 2) + priority fee, following the EIP-1559 formula. The tool maintains a history of the last 20 gas price readings to calculate a trend: if the average of the last three readings is more than 5% higher or lower than the oldest reading, the trend is marked as rising or falling. This gives users a quick sense of whether gas prices are increasing, decreasing, or stable. The cost estimation multiplies the current gas price by the user-provided gas limit, then formats the result in ETH and provides an approximate USD value.

WHAT IT CANNOT SEE

This tool cannot predict future gas price changes — gas prices are highly volatile and depend on network congestion, block space demand, and miner behavior. It cannot guarantee that estimated gas costs will match actual costs due to network congestion and block building dynamics; actual costs may be higher or lower. The tool is limited by RPC provider rate limits and historical data retention — if the provider does not store historical blocks, trend data may be incomplete. It cannot track gas fees on non-EVM chains. It cannot account for complex contract execution costs beyond gas estimation — some contract calls may use more gas than estimated due to conditional logic. It also cannot show gas fees for

PLEASE NOTE

Sites and services change over time and this app may need updating to match.