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Invest in a STM32G0 Discovery Kit for about $60. It tells you exactly what your USB-C power cube is capable of putting out.

So far I've only found one 35W Samsung cube that meet the spec of putting out 3.1V to 21V.

Most only put out one or two of the voltages of 9V, 12V, 15V or 21V. The 15W and under are usual 9V or 12V, with one being 15V. All will always default to 5V.

https://www.st.com/content/ccc/resource/technical/document/d...

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And watch out for weird pseudo-USB-C chargers. I’ve read about some cheap power tools being sold with “USB-C charging”. But they merely used the plug as a selling point. The AC adapter was a bog standard one and always sent 12V to the USB-C plug. So you’d fry any normal USB-C device you plug this into.

USB devices built according to the spec must have overvoltage protection, but yeah, I'd be surprised if all of them actually implemented it.

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