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When swapping to a token on a different chain through Talken Swap, bridge protocols are used to move assets between chains. Talken Swap automatically selects the optimal bridge based on the transaction conditions.

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Circle CCTP

Circle CCTP (Cross-Chain Transfer Protocol) is a cross-chain transfer protocol operated by Circle, the issuer of USDC.
  • Supported Token: USDC
  • How It Works: USDC is burned on the source chain, and an equal amount of USDC is minted on the destination chain. Since this transfers native USDC directly rather than using a wrapping mechanism, the USDC on the destination chain can be used immediately without unwrapping.
  • When Used: Used when moving USDC to another chain, or when swapping a source token to USDC and then exchanging it for another token on the destination chain.

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LayerZero

LayerZero is a general-purpose messaging protocol that relays messages between blockchains. In Talken Swap, tokens are moved between chains using the OFT (Omnichain Fungible Token) standard.
  • Supported Tokens: USDT, TALK, and other tokens deployed as OFT
  • How It Works: Tokens are locked or burned on the source chain, and through a LayerZero message, the same tokens are minted on the destination chain.
  • When Used: Used when moving USDT to another chain or transferring TALK tokens between chains. It is also possible to swap on the source chain and bridge in a single transaction.

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Automatic Bridge Selection

When a user requests a cross-chain swap, Talken Swap automatically selects a bridge based on the following criteria:
  • Type of source and destination tokens
  • Fees for each bridge
  • Supported chain availability
For example, Circle CCTP is selected when moving USDC from Ethereum to Polygon, and LayerZero is selected when moving USDT from Arbitrum to Kaia.

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Cross-Chain Transaction Types

TypeDescriptionExample
Bridge OnlyMove the same token to a different chainEthereum USDT to Arbitrum USDT
Swap + BridgeSwap on the source chain, then bridgeEthereum ETH -> (swap) -> USDT -> (bridge) -> Polygon USDT
Bridge + SwapBridge first, then swap on the destination chainEthereum USDT -> (bridge) -> Polygon USDT -> (swap) -> JPYC
Swap + Bridge + SwapSwap on both chains + bridgeKaia KAIA -> (swap) -> USDT -> (bridge) -> Polygon USDT -> (swap) -> JPYC

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Cross-Chain Transaction Tracking

Once a cross-chain transaction is initiated, progress is displayed step by step:
  1. Source Chain Transaction Confirmed — The swap or token transfer is included in a block
  2. Bridge Transfer in Progress — The bridge protocol is relaying the message
  3. Destination Chain Received — Tokens are minted/transferred on the destination chain
  4. Complete — The destination tokens are reflected in the user’s wallet
Cross-chain transactions typically take a few minutes, depending on the bridge protocol’s processing time. This may take longer depending on network conditions.