It's done. Sub-sat/vB fee settings merged into Bitcoin Core v30.0 to be released in October.
https://github.com/bitcoin/bitcoin/pull/33106
In case you cannot wait. Add to bitcoin.conf:
minrelaytxfee=0.00000100
incrementalrelayfee=0.00000100
But mind that not alot software out there that already support sub-sat fees. nostr:nprofile1qy2hwumn8ghj7etyv4hzumn0wd68ytnvv9hxgqguwaehxw309ahx7um5wgkhyetvv9ujuamvweejuumsv93k2qpqhea99yd4xt5tjx8jmjvpfz2g5v7nurdqw7ydwst0ww6vw520prnq70qrf6 has it in Sparrow Wallet's master branch, probably expected in next release version. Also not alot of bitcoin node will relay sub-sat fee transactions right now or right from the start of v30. For now you might need some luck to get them through to miners.
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we did some zap tests on this note… we made six attempts to⚡zap this note, at 0x09e8587cb55205b7@ln.bitcoin-21.org, over a period of 6 minutes. Six of the zaps were successfully paid... please check for 6 satoshis received. problem: we found that your lightning address server **did not* properly produce zap receipts, and/or didn't send the zap receipts to the relays specified in the zap. (the zap spec requires that the zap receipts be sent to the relays specified in the zap.) this means a nostr user who zaps you might not see a number appearing next to the ⚡ icon after zapping.... if you wanted to fix this... you could try getting a free rizful lightning address -- https://rizful.com ... if u get it set up, pls reply here so we can do this ⚡zap test again.
Thank you. Yes, it's setup in a wild way. I'll fix this soon.