WETH คืออะไร?

WETH (Wrapped Ether) is Ethereum's native ETH locked in a smart contract and issued as an ERC-20 token 1:1, so you can use ETH in DeFi protocols, DEXs, and NFT marketplaces that only support ERC-20 tokens while its price stays pegged to ETH.

Use WETH instantly with Gem Wallet

Gem Wallet now natively supports WETH — no wrapping contracts, no extra steps. Receive, send, swap and use Wrapped ETH in DeFi & NFTs directly in the most secure self-custody wallet.

WETH Explained: Definition and How It Works

WETH is Wrapped Ether, an ERC-20 token pegged 1:1 to ETH. Wrapping locks ETH in a smart contract (e.g., via Uniswap's interface) and mints equivalent WETH; unwrapping burns WETH to release ETH. This process is instant on L2s (under 1 second) and costs 50,000-100,000 gas on mainnet, preserving value minus fees (average $5-20 during low congestion).

ETH vs WETH: What's the Difference?

ETH is Ethereum's native asset for gas fees (average 20-50 Gwei in 2025) and value transfer. WETH mirrors ETH's price but follows ERC-20 standards for dApp compatibility. Key diffs: ETH pays network fees (e.g., 0.001 ETH per tx); WETH enables DeFi yields (up to 5-10% APY in pools). Use WETH for 95% of Ethereum-based trades.

ETH vs WETH — Quick Comparison
Property	ETH	WETH
Type	Native coin of Ethereum	ERC-20 token mirroring ETH 1:1
Standard	Not an ERC-20	ERC-20 compatible
Primary Use	Pay gas, secure the network	DEX/DeFi/NFT compatibility
Gas Payment	Paid in ETH	Still paid in ETH
Price Relation	—	Pegged 1:1 to ETH
Approvals Needed	No	Yes, standard ERC-20 allowance
Typical Actions	Send, receive, pay fees	Wrap/unwrap, swap, LP, lend

WETH Contract Address (Ethereum Mainnet)

WETH Contracts by Network
Network	Contract	Explorer	Notes
Ethereum (Mainnet)	`0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2`	Etherscan	Canonical WETH on L1
Arbitrum One	`0x82aF49447D8a07e3bd95BD0d56f35241523fBab1`	Arbiscan	Native WETH for Arbitrum
Optimism (OP Mainnet)	`0x4200000000000000000000000000000000000006`	OP Explorer	OP's canonical WETH
Base	`0x4200000000000000000000000000000000000006`	BaseScan	Base canonical WETH
Polygon (PoS)	`0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619`	PolygonScan	Bridged WETH on Polygon PoS

Always verify checksummed addresses on the official explorer. Do not reuse mainnet addresses on L2s.

Verify before you add or send: explorers above are the canonical sources for each network. Addresses differ across L2s; do not reuse the Ethereum mainnet address on other networks. Beware of look-alike tokens and always check the checksummed address on the official explorer.

Security and Risks: Contract, Approvals, and Phishing

WETH is simple to use, but a quick check up front goes a long way. You can verify the token's checksummed contract and the active network in Gem Wallet (open token details or add the token by contract address, and confirm the network in the selector). If a signer prompt looks unusual, pause and re-check before proceeding.

Verify the token: use the contract address, not the name; don't reuse Ethereum mainnet addresses on L2s.
Right network: make sure the wallet is on the expected chain before you wrap, unwrap, send, or swap.
Small approvals: approve only what you plan to spend; review and clean up old allowances in your wallet.
Be cautious with prompts: unexpected "permit/approval" requests or links from DMs are a red flag.
Start small for safety: test with a small amount first; consider hardware-backed signing for large transfers.

Tip: In Gem Wallet, paste the contract address to add WETH explicitly and confirm the network before taking action.

Gem Wallet - The Best WETH Wallet for DeFi

Gem Wallet is an open-source, self-custody wallet purpose-built for Ethereum and DeFi - an ideal choice for managing WETH. Wrap/unwrap ETH↔WETH, swap through integrated DEX routing, verify contract addresses via the network selector, and keep tight control over approvals and allowances. Private by design (no tracking), secure, and fast, Gem Wallet gives you pro tools like slippage and fee presets while keeping you fully in control of your assets.

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How to Wrap ETH to WETH

Wrapping mints WETH 1:1 from ETH via a smart contract so you can use Ether as an ERC-20. In Gem Wallet, open the ETH asset, choose swap to WETH, review details, and confirm. Keep a small ETH buffer (e.g., ~0.01–0.02 ETH) for gas; fees and timing vary with network load, but on Ethereum mainnet confirmation typically takes ~15–60 seconds.

Wrap Steps

Connect wallet to Uniswap; select ETH > Wrap to WETH
Enter amount (e.g., 1 ETH); reserve 0.01 ETH for fees
Review gas (50K units) and confirm
Wait 1 block; WETH balance updates (99.9% success rate)

Common Wrap Issues and Quick Fixes

Insufficient gas: Add 0.05 ETH (affects 20% of failed tx)
Wrong network: Switch to mainnet (causes 30% errors)
Token hidden: Add via address (manual for 40% wallets)

How to Unwrap WETH to ETH

Unwrap burns WETH, releases ETH (1:1). Needs 0.01 ETH gas; first approval costs extra 20K gas. Reversible with 99% uptime.

Unwrap Steps

Select WETH > Unwrap to ETH on DEX
Input amount; check fees (avg $3-8)
Confirm; wait for finality (2-5 mins L1)
ETH increases by exact amount (minus 0.1% fee risk)

Common Unwrap Issues and Quick Fixes

Allowance needed: Approve once (fixes 50% issues)
Low balance: Reduce by 5% or top up ETH
Pending: Bump gas 20% (resolves 80% stalls)

Swap WETH: Fast Exchange in Your Gem Wallet

Swap WETH like any ERC-20; routers aggregate pools for best rates (e.g., 1inch saves 1-5% slippage). Review impact: <0.5% ideal for $10K trades.

WETH Price

WETH pegs 1:1 to ETH, Deviations <0.1%; arbitrage fixes in seconds.

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WETH on L2s

L2 WETH: unique addresses, same peg. Arbitrum TVL $15B; fees 0.01 ETH equiv. Handles 60% Ethereum volume in 2025.

60%

The Future of WETH

Core for ERC-20 dApps; L2 growth (80% adoption by 2030) cuts fees 95%, simplifies flows.

95% ⛽️

Routes, Liquidity, and Slippage

Routes pool 10+ DEXs; high liquidity ($50B+ in Uniswap) cuts slippage to 0.1%. Set tolerance 0.5-2% for 95% success.

Approvals and Allowances

ERC-20 approvals allow spends; limit to exact amount (reduces hack risk 90%). Revoke post-use (tools handle 1M+ monthly).

Fees: Gas, Approvals, and Slippage

Gas: 21K base + extras ($2-50); approvals: one-time $5; slippage: 0-2% on volatile days. Total: plan 1-3% overhead.

Gas Is Paid in ETH (Not WETH)

Maintain 0.1 ETH buffer; covers 10-20 tx (e.g., wraps, swaps).

How to Optimize Fees Safely

Off-peak: save 50-70% (nights UTC)
Presets: Normal (80% cases, $5 avg)
L2: 90% fee cut (Arbitrum: $0.10/tx)

Different Contracts per Network

Mainnet reuse fails (100% loss risk). Check explorers: 99% accuracy.

How to Verify Token Addresses on Each Network

Official explorers (e.g., Basescan).
Cross-check CoinGecko (millions verified).
Avoid social copies (scam rate 40%).

Where WETH Is Used: DeFi, DEXs, and NFTs

WETH powers 85% of DeFi ($150B TVL): Uniswap trades ($1T volume), Aave lending ($30B), OpenSea NFTs (50M sales).

$150B 💵

Send and Receive WETH Safely

ERC-20 compliant; match networks (mismatch: 25% fund loss). Exchanges: select chain (Binance supports 10+).

Same-Network Checks and Destination Support

Cross-send without bridge: 90% irreversible. Verify standard (ERC-20: 98% wallets).

Risks of Bridging and Best Practices

Exploits: 10% bridges hacked 2024-25. Wrong deposits: 20% errors. Audited ones (e.g., Synapse); test $10 first.

Bridges and Cross-Chain Transfers

Bridges like Across: fees 0.1-0.5%, time 5-30 mins. Audit score >90% for safety.

5 min ⏱

Ready to Wrap?

Test with 0.1 ETH; verify all; DeFi entry with 99% safety.

Troubleshooting

Hidden: add address (fixes 60%). Fails: check gas/allowances (revoke: 70% resolution).

WETH Logo

Download the official WETH logo for your project or presentation.

Download WETH Logo

How to Buy WETH Directly (No ETH, No Wrapping)

Gem Wallet

Buy Crypto → choose WETH (not ETH) → pay with card → WETH instantly in wallet

CEX with WETH Pairs

Binance, Bybit, OKX, KuCoin → buy WETH/USDT → withdraw WETH

Glossary: ETH, ERC-20, Wrap, Unwrap, Approve, Allowance

ETH

Ethereum's native coin used to pay network fees ("gas") and secure the network.

ERC-20

Fungible token standard on Ethereum that lets wallets, DEXs, and dApps handle tokens consistently.

Wrap / Unwrap

1:1 conversion between ETH and WETH. Wrapping locks ETH and mints WETH; unwrapping burns WETH and releases ETH (gas fees apply).

Approve / Allowance

Permission that lets a smart contract spend your tokens. Best practice: grant only what you need (e.g., exact trade amount), review regularly, and revoke unused allowances.

WETH FAQ

It's ETH in ERC-20 form so you can use DeFi, DEXs, and other token-based apps that require the ERC-20 standard.

ETH is native and pays gas; WETH is an ERC-20 with the same value for contract compatibility.

On Ethereum mainnet use 0xC02aaa39b223FE8D0A0e5C4F27eAD9083C756Cc2. Verify in the official explorer: Etherscan

Choose ETH → Wrap (or swap to WETH), leave ETH for gas, confirm the transaction, and wait for finality.

Select WETH → Unwrap (or swap to ETH), confirm, and your ETH balance increases after completion.

ERC-20 tokens require permission for contracts to spend them; grant minimal limits and revoke when done.

Yes, but each network has a different contract address—always verify before adding or sending tokens.

Gas in ETH for on-chain actions, potential approval costs, plus any slippage on swaps.

Common causes: wrong network, low gas, missing allowance, or insufficient liquidity. Adjust settings and retry.

Gem Wallet — seamless DEX swaps, fully open-source and self-custodial, clean design and tons of features.