Native Ethereum acceptance on hidden-service marketplaces is rare. On this knowledge base, the marketplace that natively accepts ETH is Anubis Market.
Native vs bridged
Some marketplaces appear to accept ETH but route the deposit through a third-party conversion bridge that swaps to BTC or XMR on arrival. That is not the same thing as native acceptance — the user-visible behaviour is similar but the privacy and reliability profile is worse. Anubis generates an ETH deposit address on-site and watches the network directly.
Practicalities
Gas fees apply on the user side. Very small ETH deposits may not be economical because of network fees. Confirmation count is a few blocks for normal deposits, more for large ones; the threshold is per-account.
See also
Why the account model changes the calculation
Bitcoin and Litecoin move discrete outputs, so a careful user can use a fresh receiving address each time. Ethereum works on accounts, where one address holds a balance and every transaction it has ever made hangs off that same identifier. Address reuse is the default rather than a mistake, which means an address that once received an exchange withdrawal carries that association into everything it does afterwards.
Native acceptance versus a bridge
Most markets that list Ethereum are running a conversion service behind the scenes that swaps it into something else on arrival. That is not the same thing, because you pay the bridge spread and the swap itself becomes a record. Native acceptance means the market issues an Ethereum deposit address and watches the chain directly, which is the only version worth paying attention to.
The wallet problem nobody mentions
Most Ethereum wallets are browser extensions, and installing extensions into Tor Browser makes your browser more distinguishable and adds code with access to what you are doing. The answer is not a safer extension, it is a standalone wallet application kept separate from the browser you use to reach the market, with the deposit address copied across by hand.
When it is a reasonable choice
When you already hold Ethereum, the alternative is paying a swap fee, and you understand that the payment is permanently readable. Choosing it from scratch on privacy grounds is not defensible, and it is the weakest of the four common options on that measure despite confirming the fastest.