Use the official Manta Bridge when you are moving from Ethereum into Manta Pacific. It clears in about twelve minutes for one bridge transaction, and it does it without a second hop. The aggregators quote faster, but they are selling you a token that is not the one you asked for.
What the deposit actually does
The deposit is a call to the canonical bridge contract on Ethereum. That contract stores the deposit, and Manta's rollup picks it up from the same event stream it uses to build the L2 state. There is no locker, no multisig, and no pool in the normal path. For ETH, one signed transaction is the whole job. For an ERC-20, add the usual approval first; the bridge transaction itself is still a single call.
Plan around twelve minutes. At 30 gwei, the source transaction runs about 150,000 gas, so 0.0045 ETH of gas. The Manta side fee is cents; that is the realistic cost. If Ethereum is congested, the wait grows by block time, not by Manta's queue; Manta only sees the deposit after the source transaction confirms.
I route this way every time I need to go from Ethereum into Manta Pacific. The withdrawal direction is different; canonical exits wait on finality, so do not expect twelve minutes when you leave. The point of the official bridge is the deposit direction, where the rollup cannot ignore the sender. For that direction, it is the least imaginative and most reliable route.
The risk is the token
The native bridge's real advantage shows when you hold the result. ETH arrives as ETH, not as a proof-of-reserve ERC-20 from a liquidity pool. The same is true for the assets Manta lists as canonical, so there is no unwrap step before you can put the balance to work. If you have held USDC.e because the quoted route was cheaper, you know the future cost. Since the route goes through the same contract every time, the token is predictable. That is worth more than the two-minute saving an aggregator promises. It also means the bridge UI cannot quote you one price and settle you at another.