Wrapped Ether (WETH) Definition: Wrapped Ether is an ERC-20 token that represents Ethereum on a 1:1 basis. It exists because native Ethereum (ETH) is the blockchain’s native currency and doesn’t follow the ERC-20 smart contract standard, making it incompatible with decentralized exchanges and DeFi protocols that require ERC-20 tokens. WETH wraps Ethereum into an ERC-20 token by locking native ETH and issuing equivalent WETH tokens, enabling seamless trading and interaction with DeFi.
What Is Wrapped Ether?
Wrapped Ether solves a technical incompatibility. Ethereum (ETH) is native to the blockchain — it’s the gas and settlement currency. But it doesn’t conform to the ERC-20 standard, which is what smart contracts expect. This creates a problem: you can’t trade native ETH on Uniswap or send it through a DEX router that expects ERC-20 tokens.
WETH wraps native ETH into an ERC-20 token. When you deposit ETH into the WETH contract, your ETH is locked, and the contract issues equivalent WETH. This WETH is a true ERC-20 token — it follows the standard and can be used anywhere in DeFi.
How Does WETH Work?
The wrapping process is simple:
- Deposit ETH: You send native ETH to the WETH smart contract. You must sign the transaction from your wallet.
- Lock and mint: The contract locks your ETH and mints (creates) equivalent WETH tokens to your address.
- WETH in wallet: You now hold WETH in your wallet. It’s a standard ERC-20 token and can be sent, traded, or used in DeFi protocols.
- Unwrap: To get your native ETH back, you send WETH back to the WETH contract. The contract burns the WETH and returns equivalent native ETH to your wallet.
Worked example: You have 1 native ETH in your wallet. You want to trade it on Uniswap for USDC. But Uniswap’s trading contract requires ERC-20 tokens, and native ETH doesn’t qualify. You wrap your ETH: send 1 ETH to the WETH contract, receive 1 WETH. Now you trade 1 WETH for USDC on Uniswap. Later, you decide you want ETH again, so you unwrap: send your WETH back to the WETH contract, receive 1 native ETH.
Why WETH Exists
Ethereum was designed with ETH as the native settlement currency. When ERC-20 was created years later, it didn’t account for native ETH — the standard assumed tokens would be smart contract tokens, not the native currency. This created a mismatch: DEXs built on ERC-20 couldn’t natively trade ETH.
WETH was the solution. It’s not a perfect fix (wrapping adds an extra step), but it allows ETH to participate in DeFi without modifying the blockchain itself.
WETH vs. ETH
| Aspect | ETH | WETH |
|---|---|---|
| Type | Native blockchain currency | ERC-20 token |
| Use for gas fees | Yes, required | No, must hold native ETH separately |
| Trade on DEXs | No, requires wrapping first | Yes, fully compatible with Uniswap, etc. |
| Use in smart contracts | Limited, only in payable functions | Yes, full ERC-20 support |
| Value | 1 ETH = 1 WETH (pegged) | 1 WETH = 1 ETH (pegged) |
Why Is WETH Important for Traders?
WETH is essential for DeFi trading. Most DeFi protocols use WETH as a trading pair alongside USDC and other tokens. When you trade on Uniswap or other DEXs, you’re likely trading WETH, not native ETH.
WETH is also used in liquidity pools. If you provide liquidity to a WETH/USDC pool, you’re earning fees on WETH trades. Traders should be aware that WETH is the standard for Ethereum-based DeFi and understand how to wrap and unwrap ETH.
On PrimeXBT, you trade crypto CFDs, so WETH doesn’t directly apply. However, understanding WETH helps you understand how DeFi protocols work and what’s happening under the hood when traders interact with these protocols.
Key Takeaways
- Wrapped Ether (WETH) is an ERC-20 token representing native ETH at a 1:1 ratio, created because native ETH doesn’t follow the ERC-20 standard required by DeFi protocols.
- You wrap ETH by depositing native ETH to the WETH smart contract, which locks it and mints equivalent WETH — you unwrap by sending WETH back and receiving native ETH.
- WETH is the standard trading pair in Ethereum-based DEXs like Uniswap — most DeFi trades flow through WETH pools.
- Native ETH is required for gas fees; WETH cannot be used for gas — traders must hold both.
- WETH and ETH are pegged 1:1 and should never trade at a premium or discount — if WETH trades above 1 ETH, you can arbitrage by wrapping ETH and selling WETH.
