How much energy does a spider expend per day just waiting for its web to vibrate?

Roughly speaking, a small, complex electronic circuit or IC might sit in "sleep mode" using a current of roughly 1 µA (e.g. 1, 2), thereby using roughly $$3\times 10^{-6}$$ Watts, and that converts to roundly $$2.5\times 10^{-6}$$ kcal/hour or $$62\times 10^{-6}$$ kcal/day.

I suppose you could call that 62 micro-kcal/day or 62 milliCalories/day.

One day I noticed a small spider in my home, sitting in its small web, and kept an eye on it. After several weeks of watching I hadn't seen it catch anything. I slightly perturbed the web and it reacted. It was still alive.

Question: I'm curious to know roughly how much energy a small spider needs to sit and wait. Might this be termed roughly the spiders Basal metabolic rate?

I have read about Kleiber's law in this answer but I don't think it is meant to extend down to small spiders.

note: I'm just asking for the energy expended during resting periods. Of course during a day the spider may do web maintenance or actually catch or eat something, but it's the resting rate of energy consumption, on a daily basis, that I'm asking about.