pkgin repo

[Bob Bernstein <poobah%ruptured-duck.com@localhost>]

I am taking a first run at pkgin. It fails trying to get a file 
from:

https://cdn.netbsd.org/pub/pkgsrc/packages/NetBSD/$arch/9.99.81/All

...which can be found in my 
/usr/pkg/etc/pkgin/repositories.conf.

I have here:
 $ uname -a
NetBSD nebbytwo 9.99.81 NetBSD 9.99.81 (GENERIC) #0: Sat Mar 20 
14:30:50 UTC 2021 
mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC 
amd64

Given the version of -current I have, what pkgin repository URI 
should I use?

Thank You!

--
RSB