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j"1NF7i6ZoMDXaJ2Q5M9QFriH74ya6r6vP8u1Mempool implemented it well (and how it performs)MAs far as I know, Mempool implemented it well.
We (SatoPlay) experimented with it a few days ago. You can find more details about how it performs here:
1. https://twitter.com/satoplay1/status/1260854993143255040
2. https://gulu-dev.com/post/2020/2020-05-14-merchant-api-and-fee
https://whatsonchain.com/tx/a12e50ee4f47e1606aa5569f7fccab6f71b2df887d1c4411328a2b6bafff8fe1