Solana → EVM swap

Move SOL or USDC from Solana to an EVM chain — sign the base64 VersionedTransaction with a Solana wallet and track the order.

Solana → EVM routes are served by deBridge and LI.FI today. (Relay quotes EVM-source routes only.)

1. Quote#

TypeScript

const { best: quote } = await lh.quote({
  srcChain: "solana",
  srcToken: "SOL",               // native SOL — the wrapped-SOL mint So111…112
  amount: "2000000000",          // 2 SOL, 9 decimals
  dstChain: "arbitrum",
  dstToken: "USDC",
  sender: solanaAddress,
  recipient: evmAddress,
});

2. Build and sign#

The source is Solana, so you get an SvmTx with a base64 serialized VersionedTransaction.

TSX

import { useConnection, useWallet } from "@solana/wallet-adapter-react";
import { VersionedTransaction } from "@solana/web3.js";

const { connection } = useConnection();
const { signTransaction } = useWallet();

const tx = await lh.buildTx(quote.quoteId);
if (tx.vm !== "svm") throw new Error("expected a Solana transaction");

const unsigned = VersionedTransaction.deserialize(base64ToBytes(tx.serializedTx));
const signed = await signTransaction!(unsigned);

let signature: string;
if (tx.submitViaApi) {
  signature = await lh.submit(quote.quoteId, bytesToBase64(signed.serialize()));
} else {
  signature = await connection.sendRawTransaction(signed.serialize(), { maxRetries: 3 });
}
await connection.confirmTransaction(signature, "confirmed");

Browser-safe base64 helpers (no Buffer needed):

TypeScript

const base64ToBytes = (b64: string) => Uint8Array.from(atob(b64), (c) => c.charCodeAt(0));
const bytesToBase64 = (bytes: Uint8Array) => btoa(String.fromCharCode(...bytes));

Note

The transaction already contains a recent blockhash chosen by the provider. Sign and send it promptly — Solana blockhashes expire after roughly a minute, and deBridge asks for orders to be submitted within about 30 seconds of building.

3. Track#

TypeScript

for await (const s of lh.watch(quote.provider, signature)) console.log(s.state);

For deBridge and LI.FI the id is the Solana transaction signature.

Common issues#

Insufficient SOL for fees and rent. Solana-source swaps need some SOL on top of the amount for the network fee and any token accounts the transaction creates. Keep a small buffer when selling SOL.
Blockhash not found / expired. Too much time passed between build and send. Build again (re-quote if the quote expired).
Simulation failure in the wallet. Usually a price move beyond slippageBps. Re-quote.