Tokens & Assets

Wrapped Token

Token representing another cryptocurrency on a different blockchain

Definition

A wrapped token is a token that stands in for another asset so it can be used where the original cannot. The category covers three very different trust models that people carelessly lump together. WETH is trustless: a contract holds native ETH one-for-one and lets anyone deposit or withdraw at will, which exists purely because native ETH does not implement the ERC-20 interface. wBTC is custodial: BitGo holds the bitcoin and approved merchants mint and burn the ERC-20, so the token is a claim on a company. Bridged tokens such as USDC.e are claims on a bridge's locked balance, which means they carry that bridge's full security assumption. The only question worth asking about any wrapper is who can honour the redemption and under what conditions.

A wrapped token represents another asset in a form a chain or contract can actually use. Whether it is safe depends entirely on who holds the original and whether you can get it back.

Example

WETH has no counterparty: send 1 ETH to the contract, get 1 WETH, send it back, get the ETH, with no one able to refuse. wBTC requires trusting BitGo's custody and a merchant network for minting and redemption. On Arbitrum, USDC.e was bridged USDC backed by USDC locked on Ethereum; when Circle later deployed native USDC on the chain, the same dollar existed in two incompatible forms, liquidity split between them, and every integration had to migrate. Holders who ignored the difference found themselves in the shallower pool paying more price impact on every trade.

How it works

An issuer locks or custodies the underlying asset and mints a matching token. Burning the token releases the original. The issuer can be a trustless contract (WETH), a custodian (wBTC), or a bridge (USDC.e).

Why it matters

Most cross-chain DeFi runs on wrapped assets, and users routinely treat a bridge IOU as if it were the real thing. The distinction only becomes visible on the day the issuer fails.

What to check

Identify the issuer and the redemption path. Check whether it is trustless, custodial or bridge-backed, whether the version you hold is canonical, and where the deep liquidity actually sits between the competing wrappers.

Risks to Consider

Custodial wrappers inherit the custodian's solvency and jurisdiction: the token is a claim, not the asset
Bridged wrappers go to zero if the bridge is drained, even though the underlying asset is untouched on the source chain
Multiple wrapped versions of the same asset fragment liquidity, and the non-canonical one quietly becomes the expensive one to trade
A wrapper can depeg from its underlying whenever redemption is paused, delayed or doubted, regardless of the backing being intact

Common Questions

Is WETH the same thing as ETH?

Economically yes, structurally no. Native ETH predates the ERC-20 standard and does not implement it, so contracts cannot treat it like other tokens. WETH is a minimal contract that holds ETH and issues a matching ERC-20, redeemable at any time by anyone, with no admin key and no fee. It is the one wrapper with essentially no trust assumption beyond the contract itself, which has been battle-tested since 2017.

Why are there several versions of USDC on the same chain?

Because the bridged version arrived first. A bridge locks USDC on Ethereum and mints a representation, and that representation becomes the de facto dollar on the new chain. When Circle later issues native USDC directly on that chain, both exist at once. They are not fungible, they trade in separate pools, and the bridged one is strictly riskier since it depends on the bridge. Always check which one an interface is actually giving you.

What happens if the custodian or bridge behind a wrapper fails?

The wrapper trades on whatever the market thinks the claim is worth, which can be well below par and can reach zero. The underlying asset is unaffected, which is the cruel part: the bitcoin behind a failed wBTC still exists, it is just no longer claimable by you. This is why the wrapper's redemption mechanism and its operator matter more than the yield you can earn on it.

DeFi Glossary