Overnight.fi USDC+ wallet

What is Overnight.fi USDC+ (USDC+)?

The unusual thing about USDC+ is what it does while you are not looking: the number of tokens in the wallet grows on its own through a rebase, while each unit stays anchored near one USDC. Nothing is claimed, nothing is deposited or withdrawn to make that happen. The contract simply reports a different balance for the same address.

Underneath, USDC+ from Overnight is backed by a basket of USD stablecoins put to work in low-directional-risk strategies, and it can be minted and redeemed against USDC through the protocol. The peg is a design target maintained by that collateral, not a guarantee written into the chain.

Two details trip people up. First, rebasing tokens confuse contracts that were never written for them, which is why a wrapped, non-rebasing variant exists for use inside other protocols; the wrapped form keeps a fixed token count and moves the change into its exchange rate. Second, USDC+ is deployed separately on each chain it lives on, so a balance on one is its own token and does not sum with the other.

Supported networks in Tangem (2): Base, Blast.

Nothing on the holder's side drives any of this. The balance is a number the contract keeps, and Tangem reads whatever the network reports the moment you open the app, so a card that spends months in a drawer shows a current figure on the next check with no maintenance in between. An asset whose only movement is the one it makes by itself asks for exactly that kind of storage.