The answer
Some intent-based systems let settlement parties submit transactions and charge costs indirectly in the traded asset or quote. This is not necessarily free execution.
What to do next
Compare net received tokens and settlement fees, not only the absence of an ETH gas pop-up.
CoW Swap — Intent-based swap interface
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Ledger hardware wallet
Relevant hardware-backed signing for supported assets; it does not eliminate gas fees, contract vulnerabilities or approval risks.
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