Transaction Support FAQ

Commonly asked questions regarding an individual bridge transaction.

What does a Bridge transaction look like?

After signing a transaction from your wallet, gas fees are collected, and the transaction is initiated on the origin chain. Once accepted, the bridged asset is removed from your portfolio, and a progress bar shows the estimated confirmation time.

Once confirmed on the destination chain, the asset is added to your portfolio, and a link to the destination hash can be accessed from the progress menu. The transaction is then indexed by the Synapse explorer and will appear with your transaction history in the Activity tab.

Gas token airdrops and rebates are delivered to your wallet automatically. However, only bridgeable assets will appear in your Synapse portfolio.

How are assets moved between chains?

How assets move between chains depends on the router being used. Synapse automatically selects the appropriate router based on the tokens and chains being used.

Synapse Bridge

The origin token is added to a Pool on the origin chain where it’s swapped for a compatible destination chain asset, which is then sent to the destination chain.


Relayers on the destination chain bid to provide the best exchange rate for a given route. After delivering the destination asset, the winning bidder receives the origin token.


A native USDC contract burns and re-mints the token on its respective origin and destination chains.


Did my transaction initiate?

Transactions that fail to initiate will return an error message, and your funds will remain in your portfolio. If a transaction fails to initiate, you may safely retry the transaction.

My transaction failed to initiate after several tries

Origin chain activity volume may occasionally prevent a transaction from being accepted. These transactions return an error message, and funds remain safely in your wallet on their original chain. You may safely retry your transaction at any time; activity spikes will usually return to normal within 30-60 minutes.

Advanced techniques

  • Activity levels can be tracked on the native block explorers for your source or destination chains (e.g

  • You can update your wallet’s gas settings to make transactions from Ethereum more likely to be accepted during times of peak activity.

Why is my transaction taking so long?

Synapse estimates are based on destination block times. At times, high levels of activity may cause transactions to post in a later block than expected. The block explorer links in the transaction progress dropdown menu can confirm whether a slow transaction is actually confirmed but not yet updated on the Synapse website.

Transactions that fail to complete are not lost, and are manually addressed by the Synapse support team. You can reach out to them regarding your specific case on the Synapse Discord channel, which will also have alerts regarding slow or unresponsive chains and resolution times.

For DeFi Kingdoms users: Bridging an NFT may sometimes take up to twice as long as bridging an asset. Contact Synapse Support on Discord if an NFT transaction has been pending for more than two hours.

I received a different asset than I expected

In the event of a sudden increase in slippage on the destination chain, Synapse prevents unexpected loss by simply delivering the intermediate asset used for the Bridge transaction instead. This asset will appear in your portfolio and can be safely swapped for the asset of your choice from the destination chain.

Did I receive my rebate or gas airdrop?

While rebates and airdrops appear in your wallet automatically, only bridgeable assets are shown in your Synapse portfolio. If you don’t see an asset you should have received, first check your wallet while connected to the destination chain for your bridge transaction.


Don’t panic! Contact Synapse Support on Discord to answer any other questions you might have.

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