Many nato members are already providing much more than the US per capita.

First I disagree with using per capita numbers, that is in improper way to judge this type of thing.

However even if we look at the percapita number, the US out spend all other nato nations. Between January 24 and November 20, 2022, NATO members committed at least 75.2 billion euros of that 47.8 came from the US.

Per Capita for that period breaks down as

US: 142 Euros / citizen

UK: 117 Euros / Citizen

Canada: 96 Euros / Citizen

Germany: 70 Euros / Citizen

France: 21 Euros / Citizen

Germany would have to 2 double their per capita contributions just to match the US.

Where do they commit this money? As in: what does it pay for exactly?

Great you omitted the big spenders, and picked France and Germany who have been stepping on the break from the beginning. If you don't like per capita we can do % of GPD where the US doesn't even break in to the top ten. Unsurprisingly the biggest member of nato (by far) has given the biggest bag of money. But US is nowhere near being the most committed nations.

I picked the top spenders of NATO.

Who in NATO has given more than US, UK and Canada?

Show your sources

Estonia is 300 EUR per capita.

https://vm.ee/en/estonias-aid-ukraine

US Aid to Nato is an investment in global economic stability that is repaid via increased commerce. It is a long term investment and it has paid off time after time.

I would disagree on both assertions.