Smarty
Zipcodestack
PostalDataPI
Geoco.io
Melissa Data Quality
Loqate
usZIPCodes.org
REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

OpenRouter
MandAPI
APIClan.us
Api.Airforce
boldrouter
Requesty.ai
liteLLM
One API key for Claude and GPT models, compatible with the Anthropic and OpenAI formats. Works with Claude Code, Cursor and Codex CLI. Pay as you go, below official list prices.

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
ZIP
ZIP Code API
|
|
|
|---|---|---|
| Website | zip-codes.com | apivai.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
APIVAI is a pay-as-you-go API gateway for Claude and GPT models. One API key works with both the Anthropic Messages format and the OpenAI Chat Completions / Responses formats, so existing tools and SDKs work by changing only the base URL. Key features One key for Claude (Fable, Opus, Sonnet,...
What each product offers, as listed by its team.

No features have been listed yet.
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
No analysis of APIVAI yet.
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and APIVAI. For example, how are they different and which one is better?
When comparing ZIP Code API and APIVAI, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to ZIP Code API or APIVAI:


Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to ZIP Code API or APIVAI:

OpenAI-compatible multi-model API for GPT, Claude, Gemini, DeepSeek and more.
Compare MandAPI to ZIP Code API or APIVAI:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or APIVAI:
OpenAI-compatible AI API gateway for GPT, Claude & Grok. Change baseURL, keep your code. Pay-as-you-go USDT; $0.20 auto credit on signup.
Compare APIClan.us to ZIP Code API or APIVAI: