Cross-chain · Base → Solana

Swap WETH from Base to SOL on Solana

Swap WETH from Base to SOL on Solana. Base WETH leaves, and the wrapped SOL mint is what arrives on Solana.

Approve 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan shows the allowance, which costs ETH. Receive So11111111111111111111111111111111111111112. That is the wrapped SOL mint, checked on Solscan, not an ERC-20 on Base. Unwrapping WETH on Base would return ETH on Base and never create this mint. Phantom holds the result. MetaMask does not. Solana has no ERC-20 approval. Native SOL pays Solana fees.

Diagram for Swap WETH from Base to SOL on Solana
WETH leaves Base. SOL is what can arrive on Solana.

Not the unwrap button

Burning Base WETH returns Base ETH on chain 8453. You stay on an L2. This route sells the wrapper toward Solana and credits So11111111111111111111111111111111111111112. Use the unwrap when a Base app needs ETH. Use this page when a Solana wallet needs SOL. The quote's minimum is the amount, not a bundle of spare fee SOL.

How wallets talk about the mint

Many wallets display wrapped SOL as SOL. Native SOL is still the fee coin. Confirm the mint on Solscan rather than trusting a ticker alone. If you expected USDC or USDT, those mints are EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v and Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB. This quote delivers neither.

Allowance on one side only

Base asks for a WETH allowance. Solana does not. If ETH on Base is zero, the allowance cannot be mined, and the SOL you are buying is not there yet to pay it. Trade on Solana describes the receiving chain. No bridge time is stated. Paste a Solana address, not a 0x address.

A clean pair of checks

WETH down on Basescan. Wrapped SOL mint up on Solscan in Phantom. If you still see only Base ETH, you unwrapped locally and did not take this route. If the minimum is poor, do not sign. Solana will not show an ERC-20 approval for this mint, and Phantom is the wallet that can hold it.

Legal

Risk disclosure

XAUConnect is a non-custodial swap aggregator. Digital assets are volatile and may lose value rapidly. Content on this page is educational and not investment advice. Verify every contract address on the official block explorer before approving a transaction.

Frequently asked questions

What is the best way to swap WETH from Base to SOL on Solana?

Approve 0x4200000000000000000000000000000000000006 on Base, chain 8453. Basescan shows the allowance, which costs ETH.

Is So111 the same as unwrapping WETH?

No. Unwrapping 0x4200000000000000000000000000000000000006 returns ETH on Base, chain 8453. This route delivers So11111111111111111111111111111111111111112 on Solana, which you check on Solscan. Phantom holds that mint. MetaMask does not. Solana has no ERC-20 approval, and native SOL still pays the fee. Confirm the mint on Solscan in Phantom.

Does the wrapped SOL mint pay Solana fees by itself?

Native SOL pays Solana fees. The quote targets the wrapped SOL mint, which wallets often treat as SOL. Do not assume a large remainder is set aside for fees. You also need ETH on Base to approve WETH. Those are two different fee coins on two different networks.

What if the order was a stablecoin?

Then this page is wrong. Circle's mint is EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v. Tether's mint is Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB. Selling WETH for SOL changes your exposure. If you only needed SOL inside a Solana wallet and accept that price, the mint above is the one to match. If the order says USDC or USDT, you are on the wrong page.

Live execution

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Open the swap page with this cross-chain route pre-selected, then connect your wallet on the source chain to quote and execute. You keep the keys.

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