Private mempool on OP Mainnet: protect swaps & pool creation
How transactions on OP Mainnet can be seen by bots before they land — and what BaniPool does to protect your swaps, Zaps and pool creation.
Sandwiches, front-running and snipers
Sandwich: a bot buys right before your swap (pushing the price up) and sells right after — you get the worst price your slippage allows. Sniper: a bot buys into a new pool before its creator finishes seeding it. Both require seeing your transaction before it lands.
OP Mainnet for liquidity providers
OP Mainnet (Optimism) is an Ethereum L2 built on the OP Stack — the same technology behind Base. BaniPool supports Uniswap v2, v3 and v4 pools on OP Mainnet. Gas is paid in ETH and is generally below a few cents.
The mempool on OP Mainnet
OP Mainnet has no public mempool: transactions go straight to the sequencer and are ordered by priority fee. An extra private mempool is not needed.
Honest limits
A private mempool hides a transaction before it lands, not after: once confirmed, the transaction and pool are public on-chain. Block producers (validators / builders) still see it. Sensible slippage is still needed.
DEXes on OP Mainnet supported by BaniPool
Top OP Mainnet pools (TVL)
| Pool | DEX | Fee | TVL | Fee APR |
|---|---|---|---|---|
| USDC / WETH | Uniswap v3 | 0.3% | $3.9M | 76.9% |
| USDC / WETH | Uniswap v3 | 0.05% | $258.4K | 34.3% |
| WETH / OP | Uniswap v3 | 0.3% | $209.5K | 26.4% |
| USDC / OP | Uniswap v3 | 0.3% | $77K | 29.6% |
| ETH / USDC | Uniswap v4 | 0.05% | $60.5K | 37.9% |
| USDC / WETH | Uniswap v3 | 1% | $41.7K | 5.4% |
| USDC / OP | Uniswap v4 | 0.3% | $41.2K | 103.2% |
| ETH / USDC | Uniswap v4 | 0.3% | $34.6K | 14.7% |
| ETH / OP | Uniswap v4 | 0.3% | $25.3K | 5.6% |
| WETH / OP | Uniswap v3 | 0.05% | $19.1K | 14.2% |
FAQ
Does OP Mainnet have a public mempool?
Is the transaction really hidden?
Hidden from the public until it lands. After that it is visible like any other transaction on the explorer — what is prevented is bots reacting before your transaction executes.
How much does it cost?
On Solana just a small Jito tip per transaction (capped at 0.0001–0.002 SOL). On Ethereum & BNB the private RPCs (Flashbots Protect, MEV Blocker, PancakeSwap MEV Guard, BlockRazor) are free — you only pay normal gas. BaniPool adds no fee for this feature.