A Jito bundle volume bot sends its orders as bundles: small groups of transactions that land together, in order, or not at all, delivered through a private relay instead of the public route. That keeps pending orders out of view of sandwich bots that profit by trading around them. In PumpCrest, every session routes this way with randomized tips, and all tip costs sit inside the flat 1% fee.
The routing, in four points
- MEV is profit taken by ordering trades around yours; a sandwich is its most common form on ordinary swaps.
- A Jito bundle is all-or-nothing: every transaction in it lands in the stated order, or none does.
- Bundles travel through a private relay, so there is no public window for an outside bot to act on.
- Tips vary from order to order, and the whole tip budget is already inside the session fee.
What is MEV, in plain words?
MEV stands for maximal extractable value. It is the profit someone can make by deciding which transactions go into a block and in what order. On a busy chain, the order of trades changes who gets which price, and some operators run bots whose only job is to find pending trades they can profit from by placing their own trades just before or after them.
This needs only two things: a view of your trade before it settles, and a way to get a transaction placed next to it. Take away the first and the second stops mattering. Solana has no shared waiting room like some other chains, but transactions sent the usual way still pass through RPC nodes and on to upcoming block producers, and parties along that path can see them before they land.
How does a sandwich attack work?
Sandwiching is the form of MEV that most often hits ordinary swaps. It plays out in a fixed sequence around your trade:
- A bot sees your pending buy and how much slippage it allows.
- It buys the same token just before you, pushing the price up.
- Your buy fills at that higher price, so you receive fewer tokens for the same SOL.
- The bot sells right after you, into the price your buy just lifted, and keeps the difference.
For a single trader the loss on one trade may be small. For a volume session it compounds. A 1,000-wallet session places about 1,600 orders, and every one that gets sandwiched hands value to a third party and puts someone else's trades on either side of yours on the chart.
What is a Jito bundle?
Jito runs infrastructure that many Solana validators use to accept bundles. A bundle is a short, ordered list of transactions sent together with a tip. The rule that makes it useful is all-or-nothing: either every transaction in the bundle executes in the stated order, or none of them do. There is no state where half a bundle lands and the rest is left hanging.
Bundles go to Jito's block engine over a private relay rather than being broadcast along the usual route. The tip is a small SOL payment that rewards the block producer for including the bundle. The current limits and mechanics are set out in Jito's documentation.
How do public and bundle submission compare?
| Question | Public submission | Bundle submission |
|---|---|---|
| Who can see the order before it lands? | Parties along the route to the block producer | The relay and the block producer that takes the bundle |
| Can someone trade right around it? | Yes, if they see it in time | Far harder, since the bundle has a fixed internal order |
| Partial execution? | Each transaction stands alone | All or nothing |
| Extra cost | Base fee plus an optional priority fee | Base fee plus a tip, with a priority fee where useful |
| If it misses a slot | May land later or expire | Nothing from the bundle settles |
| Fit for many small swaps | Every order is exposed | Every order travels privately |
Why are the tips randomized?
Every Solana transaction pays a base fee, and senders can add an optional priority fee on top, as the Solana fee documentation explains. A Jito tip is a separate payment made inside the bundle, and it works like a bid for inclusion.
A bid that never changes is easy to read. If every bundle in a session tipped the exact same amount, other bidders would know precisely what they had to beat. Varying the tip from bundle to bundle removes that fixed reference point. The same thinking applies to sizes: each order is drawn at random inside the band you set, as covered in choosing an order size band, and spacing between orders is uneven.
How does bundling protect the volume you pay for?
You pay for a target: wallets x average order. In a PumpCrest session, 1,000 wallets at a 0.25 SOL average make a 250 SOL target and a 2.5 SOL fee. Private, all-or-nothing routing protects that purchase in four practical ways.
- Orders keep the shape you set. A bundled buy fills without someone else's trade wedged in front of it, so it buys what its size should buy.
- Session funding stays in the session. Value that would otherwise leak to sandwich bots stays with the orders you configured.
- The tape shows your session. The trades on the chart are your orders, not your orders plus a stranger's buy and sell either side.
- No half-finished steps. If any part of a bundle cannot execute, nothing from it settles, so there is nothing partial to clean up.
This carries on past graduation. When the bonding curve completes, execution follows the token into its pool inside the same session, PumpSwap for current launches and Raydium for older ones, and orders keep the same bundled route. What changes between those venues is covered in PumpSwap vs Raydium.
What does the bundle route cost you?
Nothing on top of the fee. The flat 1% on target volume already covers Solana base fees, priority fees, Jito tips, swap fees on every trade, token account rent, session wallet funding, comments and favorites. With the 100 SOL minimum target, the smallest fee is 1 SOL, and a 1,000 SOL session costs 10 SOL whether tips run high or low that day.
That structure matters more than it looks. When the operator absorbs tip costs, the incentive is to route efficiently rather than pass a variable tip bill back to you. You see one amount on the payment screen, and that is the whole charge.
What does bundling not do?
Bundling protects execution; it does not decide what the market does with your token. It cannot promise a trending position, a price move or a profit, and PumpCrest does not claim it can. Other traders still buy and sell freely in the same pool. What you can always do is check the result, because every settled order is public. Our guide to checking a session on Solscan shows how to read it.
Questions and answers
Does Solana have a mempool like Ethereum?
Not in the same sense. Solana forwards transactions toward the validators scheduled to produce upcoming blocks instead of holding them in one shared pool. Pending transactions can still be seen by parties along that path, which is why sandwiching exists on Solana at all. A private bundle relay narrows that exposure to the relay and the block producer that accepts the bundle.
Are Jito tips the same thing as priority fees?
No. A priority fee is an optional extra on top of the base fee, priced per compute unit, that helps a transaction get scheduled sooner. A Jito tip is a separate transfer inside a bundle that bids for the bundle's inclusion. A bundled order can carry both. In a session, every one of these costs sits inside the flat fee, so you never budget for either.
Can a bundle still fail?
Yes. If a bundle does not win a slot, or a transaction inside it would fail, the whole bundle is dropped and nothing from it settles. That sounds like a weakness, but it is the safety property: there is never a half-filled sequence on-chain. The reported volume reflects only orders that actually landed.
Do I need a Jito account or any setup of my own?
No. Routing happens entirely on the execution side. You paste a mint, shape the session and send the fee from a wallet you control. You never connect a wallet, sign bundles or install anything, because the console runs in the browser with no extension or command line. Tip amounts and relay access are handled for you inside the flat fee.
Does bundling make the trades invisible on explorers?
No. Bundles only change how orders travel before they land. Once settled, every swap is an ordinary public transaction you can open on Solscan or watch on DexScreener. The privacy covers the short window between sending and settling, which is exactly the window a sandwich bot needs and the only one that matters for this kind of protection.
Run your volume through private routing
Load a mint in the console, set wallets and an order band, and every order in the session travels as a tipped bundle, with all tip costs already inside one flat fee.
We build the PumpCrest console and write these guides from the operator side: what a session spends, what settles on-chain and what a visitor sees on the board. Corrections are welcome at support@pumpcrest.com.