Before you confirm a Pump.fun buy, open the trade settings and set a front-running protection charge, which the platform's own help center lists at 0.01 to 0.03 SOL alongside the ordinary priority fee, because the venue treats sandwich attacks as a real risk. That charge is a payment against being sandwiched, and it stops short of a guarantee.
Pump.fun takes its protocol fees automatically, but it also exposes two fees you choose before a trade: the priority fee that helps your transaction land, and the front-running protection charge that pays for a more shielded route to the chain. A platform that ships a dedicated anti-sandwich fee is admitting, in its own settings, that ordinary trades here get sandwiched.
What that fee cannot buy is certainty, and the number that really decides whether a sandwich pays off is not the fee at all but your slippage setting.
How a sandwich attack actually takes your money
A sandwich attack wraps your trade between two of an attacker's trades. A bot that can see your pending buy places its own buy just before you, which lifts the price you pay, then sells right after you into that higher price. You get a worse fill, and the bot keeps the difference.
The pattern runs in three moves. First the bot spots a pending trade it can profit from. Then it front-runs you, buying the same coin first so your order fills at a price it just pushed up. Finally it back-runs you, selling the coins it bought into the inflated price your trade created (source: Cyfrin).
One detail changes how this works on Pump.fun, because it runs on Solana rather than Ethereum. Solana has no conventional public mempool where anyone can watch pending trades wait in line, so a bot's edge comes from validator-level ordering access rather than an open queue (source: Helius). That narrows the attack surface while leaving it open, which is the whole reason how Pump.fun works still leaves room for a protection fee.
Suppose you send 1 SOL into a thin new coin, expecting a set number of tokens. A bot buys just ahead of you, the price ticks up, and your 1 SOL now buys fewer tokens than the quote promised. The instant your buy lands, the bot dumps the tokens it grabbed a moment earlier into the higher price you just paid. Nothing about the coin changed. The bot simply rented the price move your order was always going to cause, and billed it to you.
How your slippage tolerance decides a sandwich
Slippage tolerance is the most a fill is allowed to move against you before the trade cancels itself. Set it tight and a trade dies the moment a bot pushes the price too far, which starves the sandwich of its profit. Set it loose and it fills at almost any price, exactly the room a sandwich needs.
The number matters on a launchpad because the price rises automatically with every buy along the bonding curve, so a busy coin can move against you between the moment you quote and the moment you execute, and front-running bots widen that gap on purpose (source: Bitquery). To avoid a failed trade on a fast coin, people crank slippage up to a very high tolerance so the order always goes through. That habit is the trap: a slippage ceiling high enough to survive normal volatility is also high enough to absorb a bot's manipulation without canceling.
Treat slippage as a price ceiling you actively control: a tight ceiling is the cheapest sandwich defense there is, because it makes the attack unprofitable at the exact moment it would fire, and it costs nothing extra. The accounts that last in fast markets size a trade to the exit they can actually get, and they read a slippage number wide enough to dodge a failed fill as the same number wide enough to feed a sandwich.
What the front-running protection setting actually buys
The setting is a fee, listed by Pump.fun's help center at 0.01 to 0.03 SOL, that you pay on top of the priority fee to route your trade through a more protected path. It buys a lower chance that a bot can wedge itself around your order.
Keep the two user-set fees separate in your head. The priority fee, listed at 0.003 to 0.01 SOL, is a tip that helps your transaction get picked up faster. The front-running protection charge is a different line item that pays for anti-sandwich routing (source: Pump.fun help center). Both are optional, both come out of your wallet on top of the trade, and both are yours to set.
Both of these differ from the platform's automatic cut. Pump.fun charges a fixed total of 1.25 percent on bonding-curve trades, split between the protocol and the creator, and that comes off every trade whether or not you touch the protection setting (source: Pump.fun fee schedule). So the protection charge is genuinely extra money you decide to spend to make yourself a harder target. Paying it is a bet that the shielded route saves you more than the fee costs, worth making on a hot launch where bots are hunting and often skippable on a quiet coin.
Before you weigh that bet on a hot launch, you can see what a position actually costs on BloFin's fee page, then trade PUMP/USDT when you are ready.
Does paying for protection guarantee a clean fill?
No. Protection lowers the odds of being sandwiched, it does not remove them. Even on Solana, where the ordering surface is smaller, sandwich attacks still happen, and the more you widen slippage to force a fill, the more a sandwich can extract from you even with protection paid.
Solana's own developer documentation on MEV protection, covering the anti-sandwich features exchanges and apps rely on, states plainly that such a feature "may help reduce sandwich attacks but is not guaranteed to do so" and stops short of a fix for every kind of transaction ordering (source: Solana docs). That is the vendor of the protection describing its own feature as a mitigation. A protection fee and a wide slippage setting is the worst pairing of the two, because you have paid for a smaller chance of attack while leaving the door that makes the attack profitable wide open.
The same logic drives MEV protection for traders everywhere, well beyond this venue: every mitigation, from a protected route to splitting an order into smaller pieces, shifts the odds in your favor while leaving some residual risk. Treat the protection charge as one layer, keep your slippage tight as the second, and size the position so a bad fill is survivable as the third. Each of them is only one layer, and the fee is the only one you can buy.
Setting the two fees before you confirm
Set the priority fee high enough to land the trade, add the front-running protection charge if you are buying into a fast-moving coin, and set slippage as tight as the coin's liquidity allows rather than as loose as it takes to force the order through. On a thin curve, a canceled trade is cheaper than a sandwiched one.
A practical order of operations:
- Check the coin's liquidity first, since a thin coin both moves faster and punishes a loose slippage setting harder.
- Start slippage low and raise it only until the trade clears, rather than opening with a high number for convenience.
- Add the protection charge when the coin is actively trending and bots are likely circling, and skip it on a quiet market where it adds cost for little gain.
- Use the priority fee to fix a slow fill, not a bad price, because speed and price protection are two different problems.
The same logic runs when you sell, not only when you buy. An exit on a thin coin is when a loose slippage ceiling hurts most, and a rushed sell is the one a bot is happiest to sandwich. Set the numbers with the same care in both directions, and treat a canceled trade as an acceptable outcome.
Looking to trade PUMP? To get started, you'll need to first create a BloFin account, fund your account with cryptocurrency, and navigate to the PUMP/USDT Spot trading page or PUMPUSDT Perpetual page.
Frequently asked questions
Can a sell order be sandwiched, or only a buy?
Both. A sandwich profits from the price move your trade creates, and a sell moves the price down just as a buy moves it up, so a bot can short the drop your exit causes and cover afterward. Sells are often the riskier side on a memecoin, because you tend to sell into thinner liquidity than you bought into, which magnifies the price move a bot can farm. The same tight slippage discipline protects an exit as much as an entry.
What is the difference between the priority fee and the front-running protection fee?
They solve two separate problems. The priority fee is a tip that makes your transaction attractive to include sooner, so it fixes a trade that is landing too slowly. The protection fee pays for routing that makes it harder for a bot to insert trades around yours, so it targets the sandwich itself. Paying a large priority fee does nothing to stop a sandwich, and paying for protection does nothing to speed up a stuck trade.
Does buying a Pump.fun token through a centralized exchange remove sandwich risk?
It changes the risk rather than erasing it. A centralized exchange matches your order inside its own book instead of broadcasting it to a chain where bots can reorder it, so the on-chain sandwich vector does not apply to that fill. You take on the exchange's own execution and custody model in exchange, and only tokens the exchange has listed are reachable that way. It is a different execution surface, not a blanket immunity.
Is bonding-curve slippage the same thing as a sandwich attack?
No, though they feel alike from the losing side. Bonding-curve slippage is mechanical: your own trade moves the price along the curve, so a large order on a thin coin naturally fills worse than the quote. A sandwich is adversarial: another party deliberately places trades around yours to widen that gap and pocket it. A tight slippage setting limits both, but only the sandwich has a human on the other end engineering the loss.
Can I still get sandwiched on a coin that has graduated to PumpSwap?
Yes. Graduation moves a coin's liquidity from the bonding curve into a standing pool on PumpSwap, which is an automated market maker, and any on-chain swap against a pool can be sandwiched in principle. What changes is depth: a graduated coin usually has more liquidity, so the same trade moves the price less and offers a bot a smaller edge. The protection setting and a tight slippage ceiling still earn their place after graduation.
Researched and written by the BloFin Academy editorial team with AI-assisted drafting. Primary sources include the Pump.fun help center and fee documentation, Solana's MEV protection documentation, Helius developer research on Solana MEV, and a quantitative study of Pump.fun slippage by Bitquery. All facts independently verified against cited documentation current as of September 2026.
This article is for informational and educational purposes only. It is not financial, investment, trading, or legal advice. Memecoins are extremely high-risk and most lose all of their value. Platform fees, settings, and protection features change frequently, so verify current details against primary sources before trading. Do your own research and never risk funds you cannot afford to lose.