🔁Copy of 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.

Tokens supported for bridging by Across

Chains	USDC	USDT	WETH	ETH	CAKE	DAI	BAL	POOL	WBTC
ARB <> BNB	✅	❌	✅	✅	❌	❌	❌	❌	❌
BASE <> BNB	✅	✅	✅	✅	❌	❌	❌	❌	❌
ARB <> BASE	✅	❌	✅	✅	❌	✅	✅	✅	❌
ETH <> BNB	✅	✅	✅	✅	✅	❌	❌	❌	❌
ETH <> BASE	✅	✅	✅	✅	❌	✅	✅	✅	❌
ETH <> ARB	✅	❌	✅	✅	❌	✅	✅	✅	✅

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

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⚠️ 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