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serchen.com
In short: Getting listed on Serchen is free, with optional paid upgrades. Plan for about 10 minutes — it is a form plus links and assets you already have.
What they ask for: Create company listing and product profile.
Create company listing and product profile.
Open the submission page on serchen.com and complete its form — that is the "Open submit page" link at the top of this page.
Priority sets the band — this one is later. Cost (free + paid tier) and effort (quick) move it within that band, which puts it in the long tail tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.