USDC.e represents wrapped USDC tokens on the Avalanche blockchain.
This means: USDC.e on Avalanche is a "bridged form of Ethereum USDC" that was bridged from the Ethereum blockchain via the Avalanche Bridge.
USDC.e is not the same as native USDC. Instead, it is the native USDC token on the Avalanche blockchain.
To off-ramp back to fiat currency with USDC.e, you would need to “unbridge” the USDC.e back to the Ethereum blockchain via the Avalanche Bridge.
After the “unbridging”, you would end up with native USDC on Ethereum (“Ethereum USDC”) that can be used on Securitize Markets.