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

Envoy
The Receptionist
TractionGuest
SwipedOn
Teem
WhosOnLocation
VisitorTrack
Connect with Confidence

Which is more popular?
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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|---|---|---|
| Website | zip-codes.com | proxyclick.com |
| Pricing | — | |
| Platforms | — | |
| Company | Startup from the United States · 2026 | Startup from Belgium · 10 - 19 employees · 2004 |
| 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...
Proxyclick is a cloud-based solution transforming how employees, visitors, and contractors flow in and out of locations around the world. With Proxyclick, organizations ensure people are welcomed safely and efficiently on-site while ensuring all work locations are secure and comply with data...
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
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Recommended for
No analysis of Proxyclick yet.
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When comparing ZIP Code API and Proxyclick, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Visitor registration that's changing how guests are greeted in companies around the world.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The Receptionost is a visitor managemnt solution that has visitor logging system to track visitor traffic.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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