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postman.com
In short: Postman Public API Network (postman.com) accepts public api workspace and collection. It is free to submit, takes a moderate amount of preparation, and scores 98/100 on our impact ranking (highest impact).
Publish a well-documented public your tool API workspace with runnable collections, examples and the canonical API website.
Only suitable for a genuine public API; remove secrets and personal data and keep collections accurate.
Priority is do first, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.