What actually happens to the price when you swap a large chunk of an illiquid token

05 September 2026

The price moves against you - often dramatically - before your swap finishes. That is not a bug; it is the market's basic arithmetic when supply and demand are thin.

The mechanics

Every token swap on a decentralized exchange works through a liquidity pool. The pool holds two assets: the token you are selling and another asset (usually a stablecoin or ETH). A mathematical formula determines the exchange rate based on the ratio between them.

When you sell a large chunk of an illiquid token, you are removing a significant portion of that token from the pool. The ratio shifts. The pool now has much more of your token and much less of the other asset. The formula recalculates. Each successive unit of your token buys less of the other asset. This is called slippage.

In a liquid pool, your trade is a ripple. In an illiquid pool, it is a wave. The price impact can be 20%, 50%, or even 90% on a single swap. You might see the token's quoted price at $0.10, but by the time your trade executes, the effective price you receive is $0.02 - because you consumed the shallow order book yourself.

Frontrunning and sandwich attacks

If the pool is illiquid and your swap is large enough, bots watching the mempool will see your pending transaction. They can insert their own buy order just before yours (driving the price up) and a sell order just after (cashing out the pump). This is a sandwich attack. You buy at the inflated top and sell at the depressed bottom. The profit goes to the bot. The price impact you experience is worse than the formula alone would cause.

This is not hypothetical. It happens constantly on low-liquidity tokens, especially memecoins where the pool is shallow and the holder base is small.

What you actually receive

The price you see on a chart or in a swap preview is the price for a very small trade - often one token or a fraction of a cent's worth. That number is not what you will get. The real price is the average of all the marginal prices your trade triggers as it moves through the pool's depth.

If you are selling 10% of a token's total supply and the entire liquidity pool is only $5,000, your effective price will be far below the quoted price. You might get back pennies on the dollar.

Why this matters for moving out of memecoins

This is the core problem when you try to exit a low-liquidity token back into something you can actually spend or hold. The token's price on the chart may look fine. The swap preview may say "0.5% slippage." But that preview is calculated against the current pool depth, which assumes nobody else is trading. If you are the only seller and you are selling a lot, the preview is a lie by omission.

The sibling page "How to get out of a token that has no buyers right now" covers strategies for handling this situation - splitting trades, waiting for volume, or accepting the loss. But the first thing to understand is that the price impact is not an error. It is the market telling you that your token is worth less in bulk than it is in theory.

What you can do

No strategy eliminates slippage on an illiquid token. You can reduce it by splitting your swap into many small trades over time, but that takes patience and exposes you to price changes in the other direction. You can set a slippage tolerance in your swap interface - but if you set it too low, your transaction will fail. If you set it too high, you accept the loss.

The honest answer: if the token is deeply illiquid, the price impact will be severe. The only way to avoid it is to not hold large positions in such tokens in the first place. That is the lesson that leads directly back to the hub page, "Swapping in and out of memecoins," which explains why these tokens are structurally difficult to exit at any price you would choose.

Back to metamask