What happens during a swap step by step

You send one cryptocurrency. You receive a different one. That is the simplest way to describe it. But between those two moments, a sequence of events occurs that you cannot see. Understanding that sequence is how you avoid losing money.

This page walks through each stage, from the moment you open a swap site to the moment the new coins land in your wallet. It is written for someone who has never done it.

Before you begin

You need two things ready before you open a swap site. The first is the coin you want to trade. The second is the wallet where you want the new coin to arrive. That wallet must support the token you are receiving. Sending a token to an address that does not support it is a permanent loss. No one can reverse it.

What details do I need ready before I open a swap site? You need the exact ticker of the coin you are sending. You need the exact ticker of the coin you want back. And you need your own receiving address for that new token. That address is a long string of letters and numbers, or a QR code. You copy it from your wallet before you start.

Getting your receiving address

Where do I find my own receiving address for the new token? Open your wallet application. Look for a button or tab labelled "Receive", "Deposit", or the wallet icon with an arrow pointing in. Tap it. The wallet will display an address that belongs to you. Copy it exactly. Do not type it. Use the copy button or highlight the whole string. One wrong character and the coins go somewhere you cannot reach.

Some wallets generate a new address every time you request one. That is normal. Addresses are free and infinite. Using a fresh one for each swap is good practice.

Starting the swap

On the swap site, you select the coin you are sending and the coin you want to receive. You enter the amount you plan to send. The site shows you an estimated amount you will receive. That estimate can change slightly while the swap processes, because the exchange rate is the market rate at the moment the swap executes, not the moment you start. Small fluctuations are normal.

The site then gives you a deposit address. This is where you send your coins.

Why does the deposit address I send to look different each time? Each swap gets a unique deposit address. That address is not a general wallet. It exists only for that one transaction. The system uses it to match your incoming payment to your specific order. If you send funds to an address from an old swap, the system may not connect them to anything, and recovering them is difficult or impossible. Always use the address the site gives you for this exact swap.

Sending the coins

You go back to your wallet. You start a new outgoing transaction. You paste the deposit address as the destination. You enter the amount you agreed to send. Some wallets let you send the exact amount. Others require you to send the whole balance of that coin. If your wallet sends the whole balance, that is fine as long as it covers the swap amount plus any network fee.

Double-check everything before you confirm. The blockchain cannot undo a transaction. If you send to the wrong address, the coins are gone.

The waiting period

After you confirm, your wallet shows the transaction as pending. On the swap site, the status also shows pending. This is normal.

How can I tell my swap went through when the screen still says pending? Open a blockchain explorer for the coin you sent. Paste your transaction ID (the hash) into the explorer. The explorer shows the real-time status of your transaction. If it shows one or more confirmations, the network has accepted it. The swap site is waiting for a minimum number of confirmations before it proceeds. That number varies by coin. Bitcoin requires more confirmations than Litecoin. The site will update once the threshold is met.

If the explorer shows your transaction is confirmed but the swap site still says pending, wait. Some coins require multiple confirmations. If it stays pending for more than an hour, contact support.

The exchange step

Once the site has enough confirmations, it takes your coins and sends them to the exchanger. The exchanger converts your coins into the new token using its own liquidity or a connected trading platform. This step is automatic. You do not need to do anything.

The exchange rate at this moment is the rate that applies. If the rate moved while you were waiting for confirmations, the amount you receive may differ slightly from the estimate. Most platforms show a rate lock or a range. Read what the site told you before you confirmed.

Receiving the new coins

The exchanger sends the new tokens to the address you provided at the start. That transaction also needs confirmations on its own blockchain. Your wallet will show the new coins once the network confirms them.

What is the smallest amount that makes sense for a first test swap? Send an amount that covers the network fees on both sides but is small enough that losing it would not hurt. For most coins, that is the equivalent of a few dollars. Test swaps confirm that you copied the address correctly and that your wallet supports the token. Do not test with a penny. Network fees may consume the whole amount.

Special cases: memos and tags

Some blockchains require an extra identifier called a memo, destination tag, or payment ID. This is common for exchanges and for wallets that use a single address for many users.

When does a beginner actually need a memo or destination tag? You need one if you are sending to an exchange wallet or to a platform that gives you a deposit address plus a separate memo field. The swap site will tell you if a memo is required. If it is, and you omit it, the receiving system cannot match the payment to your account. The coins arrive but are not credited. Recovering them requires contacting support and proving ownership. Always paste both the address and the memo exactly as shown.

Common mistakes

What are the most common slip-ups people make on their first swap? Sending to the wrong address is the most expensive. Sending the wrong coin is next. Some people send Bitcoin to an Ethereum address. That is irreversible. Another common mistake is sending too little to cover the network fee. The transaction sits unconfirmed until the fee rises, or it gets dropped. A dropped transaction means the coins return to your wallet, but the process takes hours or days.

Some beginners close the browser tab after sending, thinking the swap is done. It is not. The swap site needs to see the confirmations and process the exchange. Closing the tab does not cancel the swap, but it means you cannot see updates. Keep the tab open or bookmark the status page.

If something goes wrong

What should I do if I sent the coins but nothing shows up in my wallet? First, check the blockchain explorer for the coin you sent. Confirm that the transaction reached the deposit address. If it did, the swap site should have received it. Check the swap status using the order ID or transaction ID. If the status shows completed on the site but the coins are not in your wallet, verify that you gave the correct receiving address. If you gave a wrong address, the coins went there. No one can retrieve them.

If the status shows pending after all confirmations, contact support. Include the transaction ID and the order ID. Support can investigate. But understand that not all problems are fixable. A wrong address is a permanent error. A network failure that drops the transaction is usually recoverable, but it takes time.

The safest approach is to test small, check every address twice, and never assume a swap is instant. It is a sequence of steps, each with its own risks. Knowing those steps is how you avoid the worst outcomes.