Early Block Bundling
Pack your developer buy and up to 28 wallet buys into a single atomic bundle that lands in the block your token launches in. Fill first, at the floor, before a sniper can react.
Bundling is the core of PumpFun Bundler. It is the difference between your community buying at the floor and a pack of sniper bots buying cheaper than you and dumping on your holders in the first minute.
What Early Block bundling is
On Solana, transactions are grouped into blocks produced roughly every 400 milliseconds. A bundle is a set of transactions that a block builder agrees to include together, in order, in the same block, or not at all. PumpFun Bundler submits your launch and all your buys as one bundle through Jito, the leading Solana bundle relay.
Because the bundle is atomic, either the token is created and every one of your wallets buys in that first block, or nothing lands and you try again. There is no half filled, exposed state where snipers can wedge in between your buys.
Atomic means all or nothing
Every transaction in a Jito bundle succeeds together or the whole bundle is dropped. That guarantee is what lets your 28 wallets buy as one move instead of a race.
The bundle timeline
Here is what happens from the moment you press deploy to the moment your hive is filled.
Up to 28 wallets in one block
Why 28 and not one big buy? Spreading the opening across many wallets does two things:
- It hides concentration. A single wallet holding a large share of supply is a red flag that scares buyers and invites a rug label. Twenty eight modest holders read as organic demand.
- It gives you flexibility later. You can sell from wallets independently through the swap manager, staggering exits instead of moving one giant position that tanks the chart.
The developer wallet is always part of the bundle, so a full launch is your dev buy plus up to 28 bundle wallet buys, all in block N. Manage the wallets themselves in Wallets.
Jito tips, slippage, and priority fees
Three settings decide whether your bundle wins the block and fills at the price you expect. Tune them per launch.
| Setting | What it controls | Turn it up when |
|---|---|---|
| Jito tip | How much you bid the block builder to include your bundle. The highest bidder for a slot wins. | The launch is hot and many bundlers are competing for the same block |
| Priority fee | The per transaction fee that helps your individual transactions get picked up quickly by validators | The network is congested |
| Slippage | How much price movement each buy will tolerate before it reverts | You expect a fast moving first candle and would rather fill than miss |
Tips and fees are a real cost
A higher Jito tip improves your odds of landing first, but you pay it whether or not you needed to outbid anyone. Slippage that is too loose can fill you at a worse price than intended. Start moderate and raise only for contested launches. See Fees for the full cost breakdown.
Bundle deploy vs snipe deploy
When you launch, PumpFun Bundler offers two deploy modes.
Bundle deploy
Create the token and buy with your whole hive in the same block. This is the default and the safest way to secure your entry before snipers.
Snipe deploy
Create the token, then have wallets buy on a short delay rather than in block one. Useful for adding follow through volume or catching an early dip. Combine with the sniper wallets described in Wallets.
Anti-sniper works with your bundle
Bundling secures your entry; anti-sniper defends the launch afterwards. The two are designed to run together. See Anti-Sniper for detection and the one tap toggle on the token dashboard.