Fei USD (FEI): Uses, Supply and Risks

Fei USD (FEI) is a stablecoin designed to track the value of one U.S. dollar. It was created by Fei Labs for use in decentralized finance (DeFi), where a dollar-oriented token can be used for trading, transfers and other on-chain activity. FEI is issued on Ethereum and is not the native token of a blockchain.

Fei’s design uses protocol-controlled value (PCV). Rather than relying only on collateral held by individual users, the protocol was designed to control assets and use them to support liquidity in secondary markets. Fei v2 was described as adding one-to-one redemption against assets controlled by the protocol, alongside a TRIBE buyback and backstop mechanism. These describe the project’s intended design; they do not guarantee that redemption or other protocol functions are currently available. Check the protocol’s current operating status before relying on FEI as redeemable for a dollar.

FEI’s main intended use is as a dollar-denominated asset in Ethereum-based DeFi. Holders may be able to transfer it, trade it, or use it in supported applications, depending on whether those wallets, exchanges and apps still support the token. FEI is not a share in Fei Labs, and holding it does not by itself give a holder rights to protocol revenue.

The target value is one U.S. dollar, but a stablecoin’s market price can move above or below its target. FEI’s design sought to support that target through protocol-controlled assets, liquidity and, in v2, redemption features. The practical value of those mechanisms depends on the assets available, market liquidity, smart-contract operation and whether redemption is functioning. Before using FEI in a DeFi position, check the specific app’s supported tokens, fees and risks, and confirm that you can exit the position under current conditions.

As of 2026-11-05, FEI’s reported circulating supply was about 3.83 million tokens, with a total supply of about 4.08 million. No maximum supply is specified. Supply figures can change, and circulating supply is not the same as the amount that may be available to trade at any moment.

FEI’s reported price was about $1.00 on that date, with a market capitalization of about $3.8 million. These are snapshots, not guarantees of future price or liquidity. A small market can have limited trading depth, so a large order may move the price or be difficult to complete near the peg. Market capitalization is calculated from price and circulating supply; it does not mean that an equivalent amount of cash is held for holders to claim. Treat the peg and reported market figures as information to check, not as proof that FEI can always be sold or redeemed for one dollar.

FEI is issued on Ethereum. When sending it, use an Ethereum-compatible wallet or platform that explicitly supports FEI, and make sure the receiving service accepts the token on that network. Sending tokens to an unsupported network or address can result in loss. For a self-custody wallet, keep the recovery phrase private and secure; anyone who obtains it may be able to control the wallet’s assets.

FEI carries stablecoin risks as well as ordinary crypto risks. Its market price can lose its dollar peg, liquidity may be thin, and the protocol’s controlled assets or redemption arrangements may not work as expected. Smart-contract faults, governance decisions, changes in protocol activity and failures at platforms that hold or trade FEI are additional risks. A stated redemption design should not be treated as a current guarantee. Before holding or using FEI, verify the token and network in your wallet, check current protocol information, and consider whether you can tolerate losing some or all of the value.