Which pump.fun bundler? What to check first
No bundler is proven ahead of the rest, and most rankings online are written by the people selling one. Compare on five things: fees, block 0 limit, who holds your wallets, how you sell, and how you get your money out.
Is a free bundler from GitHub safe?
Treat it as unsafe until you have read the code. Free bundler scripts ask for private keys, and a bad one can empty your wallets. If you try one, read it first and use throwaway wallets with small amounts. You also have to run it, maintain it, and fix it when pump.fun changes.
What fee should you look at?
Look at the sell fee first, because that is what you pay on your exit. Some tools charge 0% on buys and 5% on sells and creator fees. Unison charges 1.5% on buys, 1.5% on sells and 0.5% on creator-fee claims. Flat-fee tools can be cheaper on big launches and worse on small ones, so run your own numbers.
How many wallets in block 0?
Check the real number in block 0, not the headline wallet count. On Unison it is 6 on pump.fun, and the rest buy right behind. A 5-transaction Jito bundle caps every tool, so a bigger block 0 claim depends on how many buys each transaction can carry.
Who holds the keys?
Ask this before you fund anything. On Unison your main wallet is yours and you can export its key. Team wallets are held by Unison, cannot be exported, and can only send money back to your main wallet. So you trust Unison while money is in them. Ask any bundler what happens if it gets hacked.
Questions
Which bundler should I use on Solana?
There is no neutral ranking we can point to. Compare fees, block 0 limit, custody and how selling works, then test with a small launch.
Is there a free pump.fun bundler?
Yes, open-source scripts exist on GitHub. The cost is the risk to your keys and the upkeep.
Does Unison have a Telegram bot?
No. Unison is a web app that also works on your phone.