Doesn't exist. At least not for eBay type auction, and even the one centralized marketplace that was like a classifieds (or eBay's Buy Now), ... Paid.co, has gone defunct or otherwise requires a shitcoin token now (Stacks), I believe.
You can see some reasons and some other good discussion on the topic here:
Why did OpenBazaar Fail? #38688
Your own e-commerce site where you accept LN payments is possible .. using BTCPay Server, and other tools.
Thanks!
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