Unfortunately, the job board is limited in tagging jobs as Premium or not. To put it simply, a Premium job will not be clearly identified on the job offer. We understand this can be confusing, and we hope to add this functionality to the job board in the future!
You will primarily be able to differentiate between premium and standard Xometry work through the notes section of the job details. There will be added requirements - higher pricing, tighter tolerances, extra inspection requirements - and will often include a specific case management email to hint at the work being premium.