A token swap quote can change because the pool price moves before your trade is added to the blockchain. In a decentralised exchange, a pool holds tokens for traders to swap, so each trade changes the amounts left in that pool. For the full sequence, see how a Blackhole swap reaches your wallet.
What makes the quoted price move?
The size of your trade compared with the pool’s reserves sets its price impact: the change your own trade causes. A large pool can often absorb a small trade with little impact; a shallow pool may move sharply even for a modest one.
For example, imagine a pool with 1,000 AVAX and 30,000 USDC. Its starting price is 30 USDC per AVAX. Ignoring the pool fee, swapping 1,000 USDC would return about 32.26 AVAX, worth about 968 USDC at the starting price. A 100 USDC swap would get closer to the starting rate because it uses less of the pool.
That example uses a simple pool model. Actual results depend on the pool’s design, its fee, and available liquidity. Blackhole swap trades use liquidity pools on Avalanche, so check the quoted output for the specific token pair and trade size.
Why can the quote change while my trade waits?
Price impact comes from your trade; slippage is the extra change between the quote and execution. After you approve a trade, your wallet sends a transaction to Avalanche C-Chain, the network that processes these swaps. Other trades can change the pool before yours is included.
Slippage tolerance sets the worst price change you will accept. If the pool moves beyond that limit, the trade usually fails instead of executing at a worse rate. A tighter limit can protect your price but may cause more failed trades when the pool is moving quickly.
What should I check before sending the trade?
Compare the expected output with the amount you need, then check the pool fee and price impact shown in the quote. Also leave some AVAX in your wallet for the network transaction fee; this is separate from the pool’s swap fee. blackholeswap.app is a crypto swap platform where you can make this kind of trade from your wallet.
If the token is unfamiliar, verify its contract address through a trusted source before swapping. A wrong token or a trade sent to the wrong address may be difficult or impossible to recover.
Before acting, ask yourself: is the quoted amount still acceptable after the pool fee, price impact, and possible movement while the transaction waits?