🔁Swap Scenarios

There are 4 scenarios for Crosschain transactions.

1️⃣ Bridge Only

• Example: Bridge ETH on Base to ETH on Arbitrum

• Only supported tokens (USDC, USDT, WETH, etc) can be bridged directly. These tokens vary by source and destination chain.

2️⃣ Swap → Bridge

• Example: Swap BNB on BNB Chain to USDC on Arbitrum

• Swap BNB to a supported bridge token (e.g. USDC) using PancakeSwap pools on BNB chain

• Bridge USDC via Across to Arbitrum

3️⃣ Bridge → Swap

• Example: Swap USDC on BNB Chain to ARB on Arbitrum

• Bridge USDC via Across

• Swap USDC to ARB using PancakeSwap pools on Arbitrum

4️⃣ Swap → Bridge → Swap

• Example: Swap BNB on BNB Chain to ARB on Arbitrum

• Swap BNB to a bridge token (maximizing user output)

• Bridge via Across

• Swap bridged token to ARB on Arbitrum using PancakeSwap pools

---

⚠️ Fail Cases

Scenario	Outcome
Swap/Tx Failure on Source Chain	User instantly receives the original token on source chain
Bridge Tx Failure	Across processes a refund within 90 mins to 2 hours, and user receives the bridged asset on source chain. While Relay processes the refund within a minute in such scenario between SOL <> EVM.
Swap Failure on Destination Chain	User receives the bridged asset on the destination chain