
Google Authenticator
Authy
Duo Security
Azure Multi-Factor Authentication
Lastpass
Microsoft Authenticator
OneLogin
Auth0
PostalDataPI
Ideal postcodes
Fetchify
Smarty
Data8 UK
ZIP Code API
Data8 UK PredictiveAddress
Email Verification API
PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate โ $0.000028 per query with no tiers or subscriptions.
What you get back: Up to 18 metadata fields per postal code โ city, state/region, coordinates, timezone, three levels of administrative hierarchy, elevation, and more. Sub-5ms cached responses.
Works everywhere: US ZIP codes, UK postcodes, German PLZ, Japanese postal codes, Canadian FSAs, and 230+ more. Format normalization handles case, spacing, and hyphen variations automatically.
Get started in 60 seconds: 1,000 free queries on signup, no credit card required. SDKs for Python and Node.js. MCP server for AI agents (Claude, Cursor, etc.).
Built for developers: REST API, consistent JSON responses across all countries, OpenAPI spec, llms.txt for AI agent discovery.
Google Authenticator
PostalDataPIBased on our record, Google Authenticator seems to be more popular. It has been mentiond 8 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Download an authenticator app (Google Authenticator, Authy, or Microsoft Authenticator). - Source: dev.to / 8 months ago
Here they have support page https://support.google.com/accounts/answer/1066447. - Source: Hacker News / over 3 years ago
Many authenticator apps already exist on Google Play Store and Apple App Store. Most of them have synchronization features but are limited to backup only or sync with the same platform (ie: iOS or Android only). I'm using one of them for years and at this moment I'm feeling bothered when switching to a mobile device every time login into a website or online service. So, I created Otentik Authenticator. A Google... - Source: dev.to / almost 4 years ago
Their only docs suggest using an authenticator app (which presumably runs on the 'phone which potentially can be lost' anyway) is possible: https://support.google.com/accounts/answer/1066447?hl=en&ref_topic=2954345 If it's not showing up for you, you'd need to contact their support team to find out why. - Source: Hacker News / over 4 years ago
By the way, if you donโt already have 2FA (Two-Factor Authentication) set up on your Centric Wallet, now would be a good time to do that. Youโll need to have a 2FA app installed on your smartphone, such as Google Authenticator or Authy. Source: over 4 years ago
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
Ideal postcodes - We help businesses improve UX and data quality with a cutting edge address validation service.
Duo Security - Duo Security provides cloud-based two-factor authentication. Duoโs technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.
Fetchify - Fetchify delivers fast, accurate address, email, phone and bank validation tools that help businesses capture clean, verified customer data, reduce failed deliveries and improve checkout experiences worldwide.
Azure Multi-Factor Authentication - Azure Multi-Factor Authentication helps safeguard access to data and applications while meeting user demand for a simple sign-in process.
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.