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

SevenRooms
simpleERB
Reserve
ResyOS
OpenTable Connect
Yelp Reservations
ResNexus
Since launching in December 2012, Quandoo has expanded into 12 countries and has seated more than 150 million diners in 18,000+ restaurants.
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 | docs.quandoo.com |
| 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...
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When comparing ZIP Code API and Quandoo, you can also consider the following products.

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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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An Electronic Reservation Book for restaurants.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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