Blog
Tutorials, tips, and updates from the PostalDataPI team.
Validate 1,000 Postal Codes in One Call. Same Flat Rate Per Record.
Most postal code APIs charge a premium for bulk validation. PostalDataPI charges the same per-record price whether you send one postal code or a thousand. Here is what the new bulk endpoint does, the math, and the use cases that get cheaper today.
We Built the Postal Code API We'd Want to Use Ourselves
We asked one question before building PostalDataPI: what would annoy us if we were our own customer? Then we eliminated every single one of those things.
240+ Country Pages: Find Your Country's Postal Code Format in One Click
Every country has its own postal code format, its own quirks, and its own terminology. We just published dedicated landing pages for 240+ countries and territories — each with format references, regex patterns, and live API examples.
Beyond City and State: Up To 18 Metadata Fields Per Postal Code, for 240+ Countries and Territories
Postal code APIs used to return five things. City, country, postal code, latitude, longitude. That was it. PostalDataPI now returns up to eighteen fields per postal code — and it does it for 240+ countries and territories.
The Truly Free Postal Code API: 1,000 Queries, No Credit Card, No Catch
Most postal code APIs require a credit card before you can make a single request. PostalDataPI doesn't. Here's what you get for free, how it compares to the alternatives, and whether the free tier is enough for your project.
Regex Isn't Enough: How to Actually Validate Postal Codes
Regex catches formatting errors, but it can't tell you if a postal code actually exists. Here's why production systems need both format validation and existence checking -- and how to implement a two-layer approach.
How to Give Claude Direct Access to Postal Code Data
What if Claude could look up postal codes for you — not by generating code, but by calling the API directly? With the PostalDataPI MCP server, it can. One `pip install`, one config line, and Claude...
Could Node.js VFS Turn a Postal Code API Into a Single Executable?
Node.js is getting a virtual filesystem. We're exploring what that means for shipping a postal code API as a single downloadable binary — no Node.js installation, no npm, just download and run.
How to Migrate from Google Maps API for Postal Code Lookups: A Complete Guide
Moving away from Google Maps API for postal code lookups? You're not alone. Many developers find themselves hitting rate limits, dealing with complex pricing tiers, or simply needing better perform...
Getting Started With PostalDataPI in 5 Minutes
A quick-start guide to integrating PostalDataPI into your application. From signup to your first query in under 5 minutes, with examples in Python, Node.js, and cURL.
How PostalDataPI Supports 240+ Countries and Territories With One API Call
Building a global application? One API, one price, 240+ countries and territories. Here is how PostalDataPI handles postal code formats from US ZIP codes to Japanese postal codes to German PLZ.
Why Postal Code APIs Cost Too Much (And What We Did About It)
Most postal code APIs charge $50-200/month before you send a single query. We built PostalDataPI with a different philosophy: pay only for what you use, starting at $0.000028 per query.