Cross Chain Swaps from Solana

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const quotesParams = new URLSearchParams({
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    originChain: 'solana', // Solana mainnet
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    destinationChain: '8453', // Base mainnet
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    sellToken: 'So11111111111111111111111111111111111111112', // WSOL on Solana
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    buyToken: '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913', // USDC on Base
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    sellAmount: '10000000000000000000', // Amount of sellToken in base units
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    originAddress: '$USER_TAKER_ADDRESS', // Solana Pubkey that will make the trade
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    destinationAddress: '$USER_RECEIVER_ADDRESS', // Base address that will receive the output
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    sortQuotesBy: 'price', // Prefer the quote that will result in the best price / output
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    maxNumQuotes: 1 // only the best quote
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});
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const headers = {
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    '0x-api-key': '[api-key]', // Get your live API key from the 0x Dashboard (https://dashboard.0x.org/apps)
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};
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const quoteResponse = await fetch('https://api.0x.org/cross-chain/quotes?' + quotesParams.toString(), { headers });
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console.log(await quoteResponse.json());

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const serializedTx = quotesResponse.quotes[0].transaction.details.serializedTransaction;
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const transactionBuffer = Buffer.from(serializedTx, "base64");
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const transaction = VersionedTransaction.deserialize(transactionBuffer);
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transaction.sign([keypair]);
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const signature = await connection.sendTransaction(transaction, {
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    skipPreflight: false, // Let Solana do final preflight
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    preflightCommitment: "confirmed",
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});
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const confirmation = await connection.confirmTransaction(
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    {
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      signature,
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      ...(await connection.getLatestBlockhash()),
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    },
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    "finalized",
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);

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const statusParams = new URLSearchParams({
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    originChain: "solana", // origin chain
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    originTxHash: signature, // transaction hash of the origin chain transaction, submitted in previous step
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});
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const headers = {
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    '0x-api-key': '[api-key]', // Get your live API key from the 0x Dashboard (https://dashboard.0x.org/apps)
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};
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const statusResponse = await fetch('https://api.0x.org/cross-chain/status?' + statusParams.toString(), { headers });
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console.log(await statusResponse.json());

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const serializedTx = quote.transaction.details.serializedTransaction;
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const transactionBuffer = Buffer.from(serializedTx, "base64");
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const transaction = VersionedTransaction.deserialize(transactionBuffer);
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// Sign transaction with both keypairs
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console.log("Signing transaction with gas payer and user keypairs...");
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transaction.sign([gasPayerKeypair, keypair]);

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import { Keypair } from "@solana/web3.js";
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// 1. Fresh keypair per quote request
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const ephemeralSigner = Keypair.generate();
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const quotesParams = new URLSearchParams({
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    // ... the parameters from step 1 ...
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    solanaEphemeralSignerPubkey: ephemeralSigner.publicKey.toBase58(),
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});
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// 2. Sign with both keypairs before sending
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const transaction = VersionedTransaction.deserialize(
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    Buffer.from(quote.transaction.details.serializedTransaction, "base64"),
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);
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transaction.sign([keypair, ephemeralSigner]);