Blockchain Mempool Monitor

WHAT IT DOES

The Blockchain Mempool Monitor is a read-only analytics tool that gives you a snapshot of the current mempool state. It fetches pending transactions waiting to be mined, displaying the total count, gas price distribution (lowest, highest, average), and a list of recent pending transactions with their hashes, from/to addresses, value, and gas price. This is useful for developers monitoring network activity, traders gauging gas price trends, and users wanting to understand the current state of the transaction queue before sending their own transactions. The app supports auto-refresh every 10 seconds, so you can watch the mempool evolve in real time.

HOW TO USE

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

2. Click "Take snapshot" to fetch the current mempool data.

3. Review the stats: pending transaction count, lowest gas price, highest gas price, average gas price, and last update time.

4. Scroll down to see the list of recent pending transactions (up to 50), with hash, from/to addresses, value, and gas price.

5. Enable "Auto-refresh every 10 seconds" to automatically update the data.

6. Use the "Clear" button to reset the view.

ONE TECHNICAL SECTION

This tool uses multiple RPC methods to fetch mempool data, depending on what the provider supports. The primary method is eth_getBlockByNumber with the "pending" parameter, which returns the block that would be mined if the chain were to produce a block immediately, including all pending transactions. This is the most reliable method supported by most providers. If that fails, the app falls back to txpool_status (for count) and txpool_content (for full transaction details), which are supported by some nodes like Geth. The app also handles cases where the provider does not expose any mempool methods — it shows a clear warning and displays the data it could fetch. This multi-method fallback approach maximizes compatibility across different RPC endpoints, from public providers to self-hosted nodes.

WHAT IT CANNOT SEE

This tool cannot monitor all pending transactions on public RPCs due to provider restrictions and rate limits — most public providers limit mempool visibility to protect their infrastructure. It cannot see private transactions or those sent through private mempools (e.g., Flashbots, MEV relays), which are not broadcast to the public mempool. It cannot predict which pending transaction will be mined next, as block building is influenced by miners' policies, gas prices, and other factors. The tool is limited by the RPC's mempool visibility and block building policies — some providers only show a subset of pending transactions. It cannot view the full mempool depth on most providers; the list is typically truncated. It cannot decrypt transaction input data without the ABI — data is shown as raw bytes if available.

PLEASE NOTE

This tool works only with EVM-compatible chains that expose mempool methods. Not all providers support txpool_* methods; the tool will fall back to eth_getBlockByNumber('pending') where supported. The auto-refresh feature keeps polling the RPC — be mindful of rate limits on public endpoints. The tool is read-only and does not sign or send transactions.