TON Memo and Comment: Why Exchanges Ask for One and What Happens Without It

A memo (called a comment in most TON wallets) is a short piece of text attached to a TON transfer. Many exchanges use one deposit address for all their customers and read the memo to know whose account to credit. If you leave it out, the coins still reach the exchange, but it cannot match them to you automatically, and you have to ask support to credit them by hand.

What a TON comment is

Every transfer on the TON blockchain can carry a short text message alongside the coins. Wallets label it in different ways: comment, memo, message, tag or note. It is the same thing. The text is stored on the blockchain together with the transfer.

Two properties matter:

• It travels with the transfer. Whoever receives the coins can read it, and so can any software watching that address, such as an exchange's deposit system.
• It is generally public. Anyone looking up the transaction in a blockchain explorer can usually read a normal comment. Never put personal details, passwords or private notes in it.

For background on the network itself, see TON and Telegram explained.

Why exchanges ask for a memo

An exchange holds crypto for many customers. It can give deposits two shapes.

• One address per customer. Each customer gets a unique deposit address. Anything sent to it belongs to that customer. No memo is needed.
• One shared address for everyone. All customers send to the same address, and each customer has a personal memo. The exchange's system reads the memo on each incoming transfer and credits the matching account.

The shared model is common for TON, because it is simpler for the exchange to manage one address than thousands. If the deposit screen shows both an address and a memo, comment or tag, the exchange uses this model, and the memo is as important as the address.

Some exchanges label the field differently from your wallet. Your exchange might say "memo" or "tag", while your wallet says "comment". Put the exchange's memo into the wallet's comment field.

How to add a comment when sending

Labels vary between apps, but the process is the same.

In Telegram's Wallet

1. Open Wallet and choose Send.
2. Choose to send to an external wallet or address.
3. Pick the asset and the network the exchange lists.
4. Paste the exchange's deposit address.
5. Look for the comment field. In some versions it is on the amount screen, in others on the confirmation screen.
6. Paste the memo exactly as the exchange shows it, with no extra spaces.
7. Check address, memo and amount, then confirm.

Our full guide to withdrawing from Telegram Wallet to a bank or exchange covers the rest of that process.

In a self-custodial TON wallet

1. Choose send and pick the token.
2. Paste the address.
3. Enter the memo in the comment or message field.
4. Review and sign the transfer.

In a self-custodial wallet, nobody can stop or edit a transfer after you sign it, so check the memo twice.

Before you press send

• Copy the memo from the exchange's own deposit screen, not from an old note or a message from someone else.
• Memos are often numbers or short codes. Copy and paste instead of typing.
• Make sure the memo goes in the comment field and the address goes in the address field. Swapping them is surprisingly common.

Do tokens on TON need a memo too?

Yes, if the exchange asks for one. Tokens on TON, called jettons, such as USDT on TON, are sent with their own transfer that can also carry a comment. Exchanges using a shared address for a jetton need the memo just as they do for TON itself.

One difference to remember: sending a jetton needs a little TON in the wallet to pay the network fee. If you hold only the token, the transfer will not go through. See what are jettons and USDT on TON.

What happens if you forget the memo

The transfer itself succeeds. The blockchain does not know or care about the exchange's memo system. Your coins arrive at the exchange's address and sit in the exchange's custody. What fails is the automatic matching: the exchange's system sees a deposit with no memo, or an unknown one, and cannot tell whose it is.

So the money is not destroyed. It is unassigned, and getting it assigned depends on the exchange.

How to get a missing-memo deposit credited

1. Do not send again to "fix" it. A second transfer does not attach a memo to the first one.
2. Find the transaction details. In your wallet, open the transfer and copy its identifier, often called the transaction hash, along with the amount, date and sending address.
3. Contact the exchange's support through its official website or app, never through someone who messaged you. Choose the topic for missing or uncredited deposits if there is one.
4. Provide what they ask for. Typically the transaction hash, amount, time, your sending address and proof that you control the sending wallet. Some exchanges have a self-service form for exactly this case.
5. Wait for the review. Manual credits take longer than normal deposits. Some exchanges charge a fee for recovery, and policies differ, so check the exchange's help pages.

Our guide on how to read a TON transaction shows how to find the hash and check where a transfer went.

Why recovery is not guaranteed

Whether the exchange credits you depends on its policy and on how easily it can prove the deposit was yours. Coming from a wallet only you control, with clear details, it usually can. Coming from another custodial service, where many customers share an address, proving it is harder. Some exchanges also set a minimum amount below which they do not process recovery requests.

What happens with a wrong memo

A wrong memo is more awkward than a missing one.

• A memo that matches nobody behaves like a missing memo. The deposit is unassigned and support can investigate.
• A memo that matches someone else may credit another customer's account automatically. Recovering it then depends on the exchange reversing that credit, which is harder.

This is the reason to copy the memo from the deposit screen every time. Memos are usually personal and stay the same, but exchanges can change their deposit details, so always check the current screen.

When you do not need a memo

• Sending to a personal wallet. A friend's wallet, or your own self-custodial wallet, is identified by its address alone. A comment is optional, and the coins arrive either way.
• Exchanges with unique addresses. If the deposit screen shows only an address and no memo field, none is needed.
• Receiving into Telegram's Wallet. Check Wallet's receive screen. If it shows only an address, send to that address; if it ever shows a memo, include it.

When an exchange says a memo is "optional" or shows none, do not invent one. An unexpected comment is usually harmless, but it is better to follow the deposit screen exactly.

Worked example: a forgotten memo

This is an illustration of the recovery process.

Jon sends TON from his self-custodial wallet to an exchange but pastes only the address. An hour later, nothing has appeared in his exchange account.

1. He opens the transfer in his wallet. It shows as completed, sent to the exchange's address, with an empty comment.
2. He copies the transaction hash, the amount and the time.
3. In the exchange's app, he opens support and chooses the topic for deposits that were not credited.
4. He pastes the details and, when asked, proves he controls the sending wallet by following the exchange's instructions.
5. A few days later the exchange credits the deposit, minus a recovery fee stated in its help pages.

Had he sent a small test first, the forgotten memo would have cost him a small amount and a support ticket rather than a wait over his whole deposit.

Comment scams to watch for

Because anyone can send a tiny transfer with a comment, scammers use comments as advertising.

• Spam transfers with links. You receive a tiny amount of TON or a strange token, with a comment telling you to visit a site to claim a reward. Do not visit. These sites ask you to connect your wallet and approve transfers that empty it.
• Fake tokens. A token with a well-known name may appear in your wallet. Its value and name can be fake. Ignore it, and never try to sell it through a site named in its comment.
• "You forgot the memo" messages. If someone messages you saying they can recover a missing-memo deposit for a fee, it is a scam. Only the exchange's own support can credit a deposit.

See crypto scams on Telegram for more patterns.

Checklist before sending to an exchange

1. Open the exchange's deposit page for the exact token.
2. Choose the network the exchange lists for that token.
3. Copy the address and, if shown, the memo.
4. In your wallet, paste the address into the address field and the memo into the comment field.
5. Check the first and last few characters of the address.
6. Send a small test amount the first time.
7. Wait for it to appear on the exchange before sending the rest.

Common mistakes

• Leaving the comment empty when the exchange shows a memo.
• Typing the memo by hand and getting a digit wrong.
• Putting the memo in the address field, or the address in the comment field.
• Reusing an old memo without checking the current deposit screen.
• Writing personal information in a comment. It is readable by anyone who looks.
• Sending again to fix a missing memo. Contact support instead.
• Trusting people who offer to recover deposits. Only the exchange can.

FAQ

Is a memo the same as a comment?

Yes, for TON. Exchanges often say memo or tag, and wallets usually say comment or message. Put the exchange's memo into your wallet's comment field.

Are my coins lost if I forgot the memo?

Usually not. They reached the exchange but were not credited to your account. Contact the exchange's official support with the transaction details and ask them to credit it.

Can I add a memo after sending?

No. A transfer cannot be changed once it is on the blockchain. The fix is a support request to the exchange, not another transfer.

Do I need a memo to send TON to a friend?

No. A personal wallet is identified by its address. You can add a comment such as "thanks for dinner", but remember it is public.

Why do some exchanges not need a memo?

They give each customer a unique deposit address, so the address alone identifies the account.

Summary

A TON memo or comment is a short public text attached to a transfer. Exchanges that use one shared deposit address rely on it to credit the right customer, so when a deposit screen shows a memo, copy it exactly into your wallet's comment field, along with the right address and network. If you forget it, the coins still reach the exchange; contact its official support with the transaction hash to have them credited. Personal wallets need no memo, comments are public, and anyone offering to recover a deposit for a fee is a scammer.