Priority Fees Explained: The Trading Bot Cost Nobody Shows You

Every trading bot puts a percentage on its homepage. One percent, 0.9, whatever it is. What almost none of them mention is the number they've quietly set as your default priority fee — and on smaller trades, that number is frequently the bigger cost.

It's the least discussed line item in memecoin trading, mostly because it doesn't look like a fee. It looks like network stuff. Here's what it actually is.

What a priority fee does

When you submit a transaction, it joins a queue. Blockspace is limited, and during busy periods there are far more transactions wanting in than there's room for.

A priority fee is what you pay to jump the queue. Higher fee, better chance of being included in the next block. Lower fee, you wait, and on Solana during heavy congestion you might not land at all — the transaction just fails.

This is separate from the base network fee and separate from your bot's trading fee. Three different costs, and only one of them gets advertised.

Why it matters more than it sounds

The priority fee is a fixed cost, not a percentage. That's the whole thing.

A fixed cost on a large trade is trivial. On a small trade it's brutal. If your bot defaults to 0.006 SOL and you're placing $50 trades, that fee can be a larger share of your position than the platform's entire trading fee — and unlike the trading fee, it comes out whether the trade works or not.

Defaults vary substantially between platforms. Some bots default to around 0.001 SOL. GMGN's default is around 0.006 — roughly six times higher. Both are adjustable, but almost nobody adjusts them, which is precisely why the default matters.

There's a reason bots set them high. A high priority fee makes execution feel fast and reliable, and that's what people notice and talk about. What they don't notice is the accumulated cost across four hundred trades. It's a defensible product decision, it's just one worth being aware you're paying for.

The failed transaction problem

This is the part that actually stings, and it's specific to Solana.

If your transaction fails — too little priority fee during congestion, or slippage too tight — you generally still pay the fees. The trade didn't happen and the money's gone anyway.

So the maths on setting priority fees low isn't as clean as it looks. Three failed attempts at a low fee can cost more than one successful transaction at a sensible one, and while you're retrying, the price is moving. Underpaying has a real cost, it's just less visible than overpaying.

The genuinely correct answer is neither a permanently high default nor a permanently low one. It's dynamic — paying more when the network is congested and less when it isn't. Some platforms do this automatically. Many just set a fixed number and leave it.

How to check yours

Whatever bot you use, go into settings and find the priority fee, gas or transaction speed setting. It's usually there.

Then work out roughly what it costs you as a share of a typical trade. If you mostly trade $50 positions and your priority fee is 0.006 SOL, that's a meaningful percentage before the platform's fee, before slippage, before token taxes.

Then adjust for what you actually do:

Sniping launches — you need speed, so a higher fee is justified. Being second isn't a partial win, it's a loss.

Normal buys on established tokens — you almost certainly don't need the default. There's no competition for that blockspace.

Small position sizes — the fixed cost hurts most here, so this is where a high default does the most damage relative to what you're trading.

Busy periods — you'll need more during genuine congestion. That's the case for a dynamic setting rather than a fixed one you tune once and forget.

Where it sits among your actual costs

Worth keeping in proportion. Priority fees are one of several costs and rarely the biggest — slippage and MEV extraction usually take more from you, and both are more fixable. There's a full breakdown of everything that comes out of a trade in trading bot fees explained.

But it's the one cost that's genuinely hidden. Slippage you can at least see in your fill price. Trading fees are advertised. Token taxes are in the contract. Priority fees just quietly leave, and most people have never once opened that setting.

How we handle it

Axxel optimises priority fees dynamically rather than defaulting to a fixed high number — paying for speed when the network needs it and not when it doesn't. You can also set it manually if you'd rather control it yourself, which matters if you're sniping and want to be certain you're at the front of the queue.

That's on top of 0.9% flat trading fee, no subscription, no volume tiers, across Ethereum, Base, BSC, Solana and Robinhood Chain.

Whatever you use, though, go and look at the setting. It takes thirty seconds, and a decent share of people who do will find they've been paying several times more than they needed to on every trade for months.

Crypto trading carries risk. Nothing here is financial advice. Axxel is not available in all regions.