You can trade Bundesobligationen (Federal Bonds) of various durations on SQ. The yield curve is fairly flat and YTM are around 1.3%. If you hold to maturity (no exit fee), but 50k worth and use fix trades it will cost you about 0.3% incl stamp duty to buy.
But you may as well go for a Kantonalbank bond and lock in 1.8% with a nominal amount of extra credit risk.
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