Melissa Data Quality VS ipstack

USPS isn't the only address validation. In fact, many businesses use Melissa. Check your address on USPS.com and also on melissa.com. If melissa doesn't have your address, you can submit a "suggestion" and hopefully they'll get that fixed for you. If it's USPS that doesn't recognize your address, then (I believe) your carrier has to correct it in his route book and then (eventually) it'll work it's way to usps.com. Source: over 2 years ago

Ipstack - Locate and identify Website Visitors by IP Address. - Source: dev.to / 3 months ago

Looking to enhance your website or application with location-based services? Look no further! ipstack's Geo Lookup API is the perfect solution for seamless and accurate geolocation data retrieval. With this Free Geo IP API, you can easily obtain vital information about your users or customers, such as their country, city, latitude, longitude, time zone, and more. ipstack's API is renowned for its reliability and... Source: 9 months ago

Not really their fault. I think they mostly use https://ipstack.com/ for IP Geolocation API - their support is not the best when it comes to updating IP info. Source: 10 months ago

I had to contact https://ipstack.com/ / http://co.apilayer.net/ 5 or 6 times until they corrected the database, and Azure Sign-in logs started showing the correct details. Source: over 1 year ago

There's even a free API: https://ipstack.com/ Does seem to be less accurate than the source mylocation.org uses, as ipstack seems to think my ipv6 address is in Mons, while mylocation sees my ipv4 address as Leuven-area (which is correct). Source: over 1 year ago