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
Quandoo
simpleERB
Reserve
OpenTable Connect
Yelp Reservations
ResNexus
ResyOS is a smart reservation management platform that allows users to book online appointments for dining or eating points with individual choices of table or sitting places & other details like ticketing or web-based CRM.

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 | resy.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...
No description of ResyOS yet.
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ResyOS adding a reservation
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When comparing ZIP Code API and ResyOS, 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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A reservation, seating and guest management solution for hospitality operators to acquire, engage...
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Since launching in December 2012, Quandoo has expanded into 12 countries and has seated more than 150 million diners in 18,000+ restaurants.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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An Electronic Reservation Book for restaurants.
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