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I'm a paragraph. I'm connected to your collection through a dataset. To update me, go to the Data Manager. The Data Manager is where you store data to use in your site pages, or collect data from site visitors when they submit a form.
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Well if quality is achieve that could be related to the marketplace liquidity. Some good metrics could be : the time to fill rate, search to fill rate or buyer to supplier ratio
As For trust depends on the feature you are using to achieve this, for example if is some time of feedback given by the users so others can benefit would be measure with cohorts that means as time pases and people are sharing their feedback others benefit from it and you should see an increase in the users engagement curve
I might sound old-school, but the Net-Promoter-Score still seems relevant to me. So easy, yet so powerful. Of course it depends on what your objectives are. So I would ask you, why do you want to measure that?