Just-In-Time Liquidity Provider

WHAT IT DOES

Just-In-Time Liquidity Provider lets you supply liquidity to a pool immediately before a large swap is executed, capturing the fees from that swap, and then withdraw your liquidity shortly after. Instead of leaving your tokens idle in a pool, you monitor the mempool for large pending swaps, quickly add liquidity at the right price range, earn fees from the swap, and exit the position—all in a single batched or closely timed operation. The tool reads the current pool price and tick, checks your token balance, and simulates mempool activity to help you time your liquidity provision. This strategy can generate higher returns than passive LPing, but requires speed and precision.

HOW TO USE

Connect your EVM wallet and select the network. Enter the pool address (e.g., Uniswap V3 pool), the token you want to provide, and the amount. Set the lower and upper tick values for your desired price range. Set your slippage tolerance. Click "Check mempool" to view the current pool state and detect any pending swap activity—the tool simulates mempool detection and shows estimated swap amounts. If a pending swap is detected, click "Execute JIT liquidity" to provide liquidity and capture fees from the upcoming swap. The tool executes the liquidity provision in a single transaction.

TECHNICAL MECHANISM

The tool first reads the pool's token0, token1, and current tick using the slot0() function on the Uniswap V3 pool contract. It also checks the connected wallet's balance of the input token. For mempool detection, the tool would typically query a mempool API or use a local node to identify pending swap transactions for the target pool. In this implementation, mempool detection is simulated. When a pending swap is detected, the tool calls the NonfungiblePositionManager's mint() function to create a concentrated liquidity position at the specified tick range, using the provided token amount. The position captures fees from the swap that occurs immediately after the transaction is mined. The tool uses receipt.effectiveGasPrice for accurate gas reporting and provides progress feedback.

WHAT IT CANNOT SEE

This tool cannot reliably detect or predict large swaps without external mempool data or APIs—the simulation is a placeholder for demonstration. It relies on the DEX supporting concentrated liquidity and fast position management; pools that do not support this mechanic or use non-standard LP tokens are not supported. The tool cannot guarantee that the JIT liquidity will be profitable—it depends on the size of the swap, the fees captured, and the gas costs of the transactions. It also cannot guarantee optimal timing—the swap may not execute immediately after your liquidity is added, or it may be front-run by other JIT providers.

PLEASE NOTE

JIT liquidity provisioning is an advanced strategy that requires speed and careful timing. Gas costs and slippage can significantly impact profitability. The position manager contract must be trusted; verify its security and audit status before use. This tool is for EVM chains only and does not support non-EVM networks.