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Pump.fun bundle checker: reading launch-slot buyers

How to check whether a Pump.fun token was bundled at launch, what the launch-slot buyer share measures, and why buying in the same slot does not prove one owner.

RugSignal editorial notes · Published · Updated · Source-based, not investment advice.

What a bundled launch is

A bundled launch is coordinated buying in the token's first block: the creator or associated wallets submit the create transaction and several buys together, often as a block-engine bundle, so a group of wallets holds supply before anyone else can trade. Buying in the launch slot is not proof of coordination on its own, because independent bots also try to buy the first block of new tokens.

What RugSignal measures

For a verified Pump.fun launch, the bonding curve is the only venue at launch and every buy calls the launchpad program, so the scanner pages through the complete launch slot and lists every buyer except the launcher. It then reports how much of the current supply those buyers still hold. When a token is not a verified launchpad launch or its history is truncated, the figure is labelled a lower bound or reported as unavailable, never as a passed check.

Why the share still held matters most

A large launch-slot purchase that has already been sold is history: it may explain an early price drop, but it can no longer be sold again. The share those wallets still hold is what can be sold into the curve or pool later. Read it next to creator holdings and overall holder concentration, because bundles often split supply across many wallets to keep each one small.

Same slot is not the same owner

Two wallets buying in the same slot may be strangers running the same bot. Linking them needs funding evidence, such as a shared funder, transfers between them or one owner behind several token accounts. The holder cluster guide explains what a funding edge does and does not establish, and an entitled RugSignal account can investigate sampled clusters in more depth.

Check a launch yourself in an explorer

Open the exact mint in a Solana explorer and sort its transactions from the oldest. Find the creation transaction and note its slot, list the buy transactions in that same slot and their signers, then look up each signer's current balance of the token and where its SOL came from. This needs no wallet connection, but it is slow for busy launches, which is why the free scan records the slot, the buyers counted and whether the slot was read completely.

Use the result alongside other checks

A low launch-buyer share does not make a token safe, and a high one does not prove a scam. Combine it with mint and freeze authority, holder concentration, creator holdings and liquidity control. RugSignal reports each of these with its source and observation time, so you can see which parts are established and which are still unknown.

Sources and further reading

Official protocol documentation explains capabilities; it does not certify an individual token. RugSignal-specific statements describe our current implementation.

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