The IMF seem to think it's good enough to peg their special not-a-currency currency to.
https://www.imf.org/en/topics/special-drawing-right
All IMF participating states have allocations of SDRs. By your definition, the IMF is "pegged" to the currency of Afghanistan.
alt Hacker News
All IMF participating states have allocations of SDRs. By your definition, the IMF is "pegged" to the currency of Afghanistan.