You send: Ethereum
Ether is the native asset of Ethereum, the smart-contract network that hosts most tokens and DeFi applications. It pays the gas fee of every transaction on that network, including transfers of ERC20 tokens. More about Ethereum.
On this pair it moves over ERC20 — an address there starts with 0x — 42 characters.
ETH also exists on other networks — different addresses, not interchangeable: Arbitrum, Base, Linea, Manta, Optimism.


