Large cross-chain swaps need a plan to limit slippage

To reduce slippage on a large cross-chain swap, compare the full route, trade in manageable parts when that helps, and set a minimum amount you are willing to receive. Slippage is the gap between the quoted and final price. A large order can widen that gap by using up the best-priced liquidity in a pool.

Why does a large cross-chain swap lose value?

A large swap can move the price against itself. In a liquidity pool, each trade changes the balance of the tokens available. The next part of a large order may therefore get a worse rate than the first. This is called price impact.

Cross-chain swaps add steps. A route may trade one asset on the source chain, move value across a bridge or network, then trade again on the destination chain. Delays can leave time for prices to change. Fees and the liquidity at each step also affect the final amount.

Routes differ in how they handle those steps. For a plain explanation of how Thor Swap routes cross-chain trades, see the linked guide. When comparing any route, focus on what arrives at the destination, not just the first quote.

How can I lower slippage before swapping?

Start by checking the expected output for the whole trade. Compare the route’s quoted amount after fees, and check whether it uses one pool or several. A route through more pools can spread demand, but it also adds fees and more points where the price can move.

Splitting a trade can help if one order would drain a thin pool. Smaller orders may face less price impact at each step. But splitting is not automatically better: each part may incur another fee, and prices can move between trades. Use the preview to compare the total expected output, including fees, for one order and for a few parts.

• Check the amount expected to arrive, after route fees.
• Compare more than one route if the swap service offers a choice.
• Consider smaller parts when a single order has high price impact.
• Recheck the quote if the market moves or the route takes time.

What should I set before confirming?

Set a minimum output: the least you will accept at the end of the swap. If the route cannot meet it, the trade should fail instead of completing at a worse rate. A tighter minimum gives more protection from price changes, but it can also mean the swap does not go through. A very loose setting makes execution easier while allowing a larger loss.

Read the final preview for the received asset, fees, route and minimum output. Make sure the destination address and network are right, since a correct price cannot fix a wrong destination. For most readers, the better choice is to accept a failed swap and review the quote than to raise the slippage limit simply to force it through.