Cross-chain swaps via API: Ethereum to Solana walkthrough

Cross-chain swaps require a wallet on the source chain and optionally a destination address. XAUConnect routes through 0x Cross-Chain (with composite USDC-bridge fallbacks when direct routes are unavailable).

Quote with taker addresses

const { quote } = await api.crossChainQuote({
  fromChainKey: "ethereum",
  toChainKey: "solana",
  tokenIn: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", // USDC
  tokenOut: "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v", // USDC Solana
  amountIn: "1000000000",
  slippageBps: 50,
  taker: "0xYourEthWallet...",
  takerDestination: "YourSolanaWallet...",
});

Build and inspect executionSteps

The build response includes executionSteps[] describing each wallet action. Composite routes may require multiple transactions (swap → bridge → swap).

Poll bridge status

const status = await api.crossChainStatus(
  quote.quoteId!,
  "ethereum",
  originTxHash,
  "solana",
);
// status.status: pending | completed | failed | unknown