What is a destination tag and why do some cross-chain swaps require one

05 September 2026

A destination tag is an extra piece of data - usually a number or short string - that tells the receiving blockchain which specific account or transaction the incoming funds belong to. Some cross-chain swaps require one because the destination blockchain uses a single shared address for many users, and without the tag the swap service cannot route the coins to the right person.

How a destination tag works

Think of a destination tag like an apartment number on a building address. The blockchain address is the building. Many people can receive mail there. The tag tells the post office which apartment the package goes to.

On blockchains such as Ripple (XRP) and Stellar (XLM), every user technically shares the same underlying ledger structure. When you deposit coins to an exchange or a swap service, the service gives you one address but asks for a unique tag every time. The tag links your specific transaction to your account inside the service’s database.

Other blockchains, including EOS and certain tokens on the Binance Chain, use a similar system. The address alone is not enough to identify you uniquely.

Why cross-chain swaps need them

When you swap crypto across chains, the swap service receives your coins on one chain and sends you different coins on another chain. The service needs to know exactly which user to credit on the receiving side.

If the receiving chain uses a shared address model, the service cannot just look at the incoming address to know it is you. Several users’ funds might arrive at the same address at roughly the same time. The destination tag is the only way to separate them.

Without a tag, the service would have to guess or manually match transactions - which is slow, error-prone, and defeats the purpose of an automated swap. A missing tag usually means the swap fails, and you have to contact support to recover the funds.

When you do not need one

Most blockchains - Bitcoin, Ethereum, Solana, Polygon, and others - assign each user a unique address for each transaction. There is no shared address model. In those cases, a destination tag is irrelevant. The swap service can identify your deposit by the address alone.

The rule is simple: if the receiving chain requires a memo, tag, or note for deposits, then the swap will ask for one. If it does not, the field will be absent or optional.

What happens if you forget

Forgetting a required destination tag is common. The funds still arrive at the service’s address, but the service does not know they belong to you. Most swap services hold such lost deposits and will return them - after you prove ownership - but the process can take days or weeks. Some services charge a recovery fee.

A few services automatically reject transactions missing a required tag. The coins bounce back to the sender’s address, minus network fees. Neither outcome is ideal.

The broader context

This detail matters most when you are moving assets without using a bridge or a centralised exchange account. A cross-chain swap service is one way to do that - you send coins from your wallet and receive different coins in your wallet. The destination tag is a small piece of information that keeps the process automatic. Without it, the swap cannot function.

If you want the full picture of how these services work without a bridge, the hub page Swapping crypto across chains explains the underlying mechanics in more detail.

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