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publicapis.io
In short: Getting listed on PublicAPIs.io is free. Plan for about 10 minutes — it is a form plus links and assets you already have.
What they ask for: List your legitimate documented API in the relevant developer category using the normal or Pro review queue.
List your legitimate documented API in the relevant developer category using the normal or Pro review queue.
API must be real and documented; paid placement should be disclosed and does not guarantee organic ranking value.
Open the submission page on publicapis.io and complete its form — that is the "Open submit page" link at the top of this page.
API must be real and documented; paid placement should be disclosed and does not guarantee organic ranking value.
Priority sets the band — this one is medium. Cost (free) and effort (quick) move it within that band, which puts it in the useful tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.