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I tried doing am $18 swap with an $0.80 estimated fee. It's still greyed out. Is the swap still too small? seems like the issue might be something else.

not sure why it's estimating such a low fee. btc mainnet fees are usually like $5 or so if i'm not mistaken. smallest BTC swap i've done is like $50.

$100 seems to work with a $6 associated fee

this looks more like it

I'll try with something above $50 in a bit; see if that works.