Numverify VS Smarty

Numverify — Global phone number validation and lookup JSON API. 250 API requests/month. - Source: dev.to / over 1 year ago

As the name implies, phone confirmation APIs are used to verify contact information. Phone numbers are checked for validity and continued use by verification APIs and services (i.e., they exist). They can also be used to identify geographic data and standardize phone numbers for regulatory purposes. The phrase phone verification API is extremely broad. - Source: dev.to / over 1 year ago

This technology can be used in combination with other security measures to further protect your privacy and prevent fraudsters from getting through to you. When it comes to privacy and security, there are a few things more important than keeping your phone number safe. That's why reverse phone API can be such a valuable tool. By using this technology, you can keep your number hidden from public view, making it... - Source: dev.to / almost 2 years ago

Phone Numbers are required by businesses for various purposes as some use mobiles to send out greetings on a regular basis, while others use messaging to market products or services, and still others necessitate phone numbers to provide better service. Therefore for the verification of these numbers, phone number verification APIs are best to validate them. The business can avail the benefits such as saving time... Source: almost 2 years ago

Phone confirmation APIs are being used to validate contact information, as the name simplies. Verification APIs and services check phone numbers to make sure they're still in use and legitimate (i.e., they exist). For regulatory concerns, they can also be used to standardize phone numbers and identify geographical data. Phone Verification API is a vast term in itself. - Source: dev.to / about 2 years ago

There are online formatters like smartystreets.com which can validate and format your international address. Is this what you are looking for? Source: over 2 years ago

What I've noticed after watching those sneaker botting videos is that they can make as many emails, proxies and debit cars numbers as they want but.... Not addresses. According to this video they mix up the way their address are written which somehow fools their system into thinking there aren't repeats even though the shoes some how end up at the same address. What these sites really need is a third party service... Source: about 3 years ago

At one point they used SmartyStreets to validate your address and if it thinks your duplex and your neighbor is the same house, they'll be treated as one so you cannot get fiber now. Source: about 3 years ago

You can give smartystreets.com a try however for that many records it might cost you just a bit. Source: about 3 years ago

A good source that is free in small quantities for all states and in the world: smartystreets.com. Source: about 3 years ago