What is an Approve Transaction?

On EVM blockchains (Ethereum, BNB Chain, Polygon, Arbitrum, Base, etc.) and on Tron, you cannot simply send tokens together with a smart-contract call. You must first give the contract permission to access a specific amount of your tokens.

When using Allbridge Core, you will see an Approve prompt before sending tokens or providing liquidity.

To minimize security risk, Allbridge Core only requests approval for the exact amount needed. Some other dApps ask for unlimited access to your tokens, but we avoid this approach. In most wallets you can also review and, in many cases, edit the exact amount being approved before confirming the transaction.

Please note that approving exact amounts means you will need to sign and pay for an approval transaction each time you interact with Allbridge Core.

On blockchains like Solana, Stellar, and Sui, tokens are transferred to smart contracts in a different way, so no approval step is required there.