Wrapped Ether

Key points

• Wrapped Ether, or WETH, is a version of ether wrapped in the standard token format of the Ethereum network.
• It exists because ether, being the native currency, does not by itself follow the same standard as the network's other tokens.
• One WETH is always equivalent to one ether, and conversion between the two can be done at any time at a one-to-one ratio.

What is Wrapped Ether?

Wrapped Ether is ether packaged in the network's standard token format. The prefix "wrapped" indicates exactly that: taking an asset and enclosing it in another format so that it behaves like the rest. Ether, being Ethereum's native currency, came before the standard that today governs the network's tokens, and for that reason does not automatically follow that standard.

How it works

Many applications on the network were built to handle tokens that follow the common standard. Pure ether, not following that standard, would require special handling in each of them. To solve this uniformly, WETH was created: the user deposits ether into a contract and receives, in exchange, the same amount in WETH, which already behaves like any other standard token.

The process is reversible and maintains parity. At any time, it is possible to return the WETH to the contract and redeem the original ether, always at a one-to-one ratio. There is no gain or loss in the conversion itself; WETH is simply the same value in a different package, and it is backed by the ether actually deposited in the contract.

In practice, WETH is widely used on decentralized exchanges and other services, where trading and combining tokens in a standardized way is simpler. By converting ether into WETH, the user can then use it in these environments just as they would any other token, without the application needing to treat the native currency as a special case.

Trust in WETH depends on the soundness of the contract that issues it and holds the corresponding ether.

Why it matters

Understanding WETH helps explain why, when using certain applications, it is necessary to convert ether into a wrapped version before operating. For those interacting with decentralized exchanges, this conversion is a common step. This is a technical concept and does not represent any trading recommendation.

Limitations

WETH depends on the contract that issues it: a failure in that contract affects the backing that guarantees parity with ether. Conversion also consumes network fees, and the existence of two forms of the same asset can confuse those unfamiliar with the distinction. None of this constitutes a trading recommendation, only a description of how the mechanism works.