The error seems to say you provided "txid" as the txid.
Did you literally enter "txid" or did you enter a txid like d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c?
Asking because I get the same error when I enter this:
$ lncli wallet bumpfee --sat_per_byte txid:6
but I don't when I enter this:
$ lncli wallet bumpfee --sat_per_byte 6 d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c:6
I think you are confused by txid and index:
Considering {index} as the set of numbers I get when checing the transaction on https://mempool.space/tx/{index}
that's not the index in the URL, that's the txid (32 bytes). The index is simply a number that points to an output of that transaction as there can be many. I don't think you need to encode it as hex, you can use decimal.
I didn’t try it myself but this sounds like the right answer
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ok this make much more sense, thank you for the clarification.
so if the txid is d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c, where do I get the index value? It's necessary to complete the Replace-By-Fee transaction?
If I try without index I get the this error: [lncli] outpoint should be of the form txid:index

Ok, then! The transaction I'm playing with has only two outputs so, assuming the index will be equal to0 or 1, I tried the following:
lncli wallet bumpfee --sat_per_byte 4 d3c999e3c258e6c9808bfcd73d5910bc9a037ebdf22277b0397f8e3ed1f2628c:0
and get a new error: [lncli] rpc error: code = Unknown desc = the passed output does not belong to the wallet

Ok, first fail, let's try with index 1:
lnshell
and I get the below as output in the cli:
{ }
[lncli] rpc error: code = Unknown desc = invalid output index 2 for transaction with 2 outputs So now I don't know... did it went through? I check the mempool and look's it didn't

Ok, let's try with index equal 2
lnshell
[lncli] rpc error: code = Unknown desc = invalid output index 2 for transaction with 2 outputs
🤔
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12 sats \ 1 reply \ @ChrisS 2 Aug
The empty brackets means you successfully tried the rbf(replace by fee). It doesn’t mean it’s confirmed or not but it’s now in the mempool with the higher fee.
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Nice, thanks for the clarification
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PS: in the meantime the transaction got confirmed, and I can see (one of) the RBF when through
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deleted by author
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