Is api.hyperfish.com safe? Based on what we found, the answer is a clear no — but not because it's obviously malicious. The bigger problem is that nothing about this site checks out for a business that's supposed to offer an API service.
The homepage itself returns a 404 error with a generic endpoint-not-found message. That means the site isn't actually working. Combined with a completely hidden domain registration — no WHOIS record at all — and zero presence on the Wayback Machine, there's simply no evidence this is a real, active service. Most legitimate API providers have documentation, developer portals, and contact information. This site has none of that.
If you're considering using api.hyperfish.com for anything, there's not enough information to make an informed decision. The safest move is to assume it's not operational and look for established alternatives with transparent ownership and working products.