What is memo / destination tag?

An extra identifier some networks require alongside the address, so a shared exchange wallet knows which customer a deposit belongs to.

XRP calls it a destination tag and several other chains, including Stellar, Cosmos, and TON, call it a memo. The field appears on an exchange deposit screen as a short string of digits or letters next to the address, usually with a warning in bold above it.

Leaving it out is one of the most common ways people lose access to a deposit. The funds are not destroyed: they arrive at the exchange's wallet correctly, but nothing tells the exchange whose they are, so nothing is credited until support locates the transaction manually.

How it works

On these networks an exchange does not give every customer a unique deposit address. It operates one pooled address and distinguishes customers by the tag or memo attached to each incoming transaction. The chain treats it as an ordinary transaction field and carries it without interpreting it.

That is why the pairing matters. The address routes the money to the exchange. The memo routes it to your account inside the exchange. Sending the right address with no memo, or with a memo copied from a different exchange, produces a transaction that is valid on chain and unattributable off it.

Recovery depends on the receiving venue. Most publish a process, some charge a fee for it, and some state plainly that certain cases cannot be recovered at all. The time involved is measured in days rather than minutes, and the funds are unavailable throughout.

Two details save trouble. Withdrawing from another exchange to a memo chain usually offers a memo field that must be filled in, not left blank. And a self-custody wallet sending to an exchange will often let you send without one, because the wallet has no way to know the destination requires it.

Example

Illustrative sequence. You withdraw XRP from one exchange to another. The receiving exchange shows an address beginning with r and a destination tag of 3847192. You paste the address, leave the tag blank because the field was optional in the sending wallet, and send.

The transaction confirms in seconds. A block explorer shows it settling at the correct address. Your balance at the receiving exchange stays at zero, because the credit routine has no tag to match. You then open a support ticket with the transaction hash, the amount, and the date, and wait for the exchange to locate and credit it by hand.

Why it matters when you buy

Any transfer between exchanges on XRP, Stellar, Cosmos, or a similar chain runs this risk, and moving between venues to get a better price or a cheaper fee is exactly when people do it in a hurry. Before a first transfer to a new venue, check the deposit screen for a memo field and send a small test amount. The venue profiles at the exchange directory and our guide on sending crypto across chains at Sending crypto across chains cover the wider set of transfer mistakes.

Related terms

• deposit address — the other half of the pair
• transaction id — what support will ask for
• confirmation — on-chain arrival without a credit
• withdrawal whitelist — pre-saving verified destinations
• address book — where saved pairs live
• network fee — paid whether or not it credits

Questions

I sent without a memo. Are my funds gone?

Usually not. They sit in the exchange's pooled wallet and can often be credited after a support ticket with the transaction hash. Recovery is not guaranteed and can take days, and some venues charge for it.

Does every network use memos?

No. Bitcoin, Ethereum, and most chains give each customer a unique deposit address, so no extra field exists. Memos appear where an exchange pools deposits into one address.

What if the memo field is optional in my wallet?

Optional in the sending wallet does not mean optional at the destination. If the receiving exchange displays a tag or memo, it is required, and only the receiving venue's deposit screen is authoritative.