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PostalUp

postalup.com

From $1.58/mo Free plan WebAPI
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Spec score 7.8 #17 of 30 in Address Verification Software

What it is

PostalUp provides ZIP code databases and an address validation API for U.S. address data. The API supports standardization, verification, geocoding, and bulk processing; PostalUp says its address API uses USPS data refreshed monthly. Submitted addresses are processed in real time and are not permanently stored except as needed to provide the service or as permitted by the Privacy Policy. Developers can use API documentation, code examples, a playground, webhooks, and a Postman collection, with examples or options for JavaScript, Python, PHP, Ruby, cURL, Go, and Java. An OpenAPI specification is also available. Database downloads vary by product and include CSV, JSON, Parquet, GeoJSON, and Shapefile formats; listed data sources include USPS, Census, OMB, HUD, and TIGER. Use cases include e-commerce, real estate, logistics, marketing, insurance, and healthcare. The free API plan includes 1,000 requests and basic validation. Paid API plans start at $29 a month; separate database plans are annual, starting at $19 a year for ZIP Code Database Basic. Internal commercial use is included with downloads, but redistribution to customers requires a redistribution license.

Spec sheet

Product
PostalUp provides ZIP code databases and an address validation API for address standardization, verification, geocoding, and bulk address processing.Read 7 Oct 2026 · postalup.com
Integrations
The developer page provides a Postman collection and an OpenAPI specification for working with the API.Read 7 Oct 2026 · postalup.com
Support
The developer page says technical support from its engineering team responds within 24 hours.Read 7 Oct 2026 · postalup.com
License
The downloads page says internal commercial use is included, while redistribution to customers requires a redistribution license.Read 7 Oct 2026 · postalup.com
Company
The terms identify PostalUp, Inc. and give an Austin, Texas address of 13359 N Highway 183 Suite 406-528, Austin, TX 78750.Read 7 Oct 2026 · postalup.com
Address processing
The terms state that address data submitted for validation is processed in real time and is not permanently stored except as necessary to provide the service or as permitted by the Privacy Policy.Read 7 Oct 2026 · postalup.com
API data
The homepage says its address API uses USPS data refreshed monthly.Read 7 Oct 2026 · postalup.com
Data sources
The downloads page says its datasets are sourced from USPS, Census, OMB, HUD, and TIGER.Read 7 Oct 2026 · postalup.com
Developer tools
The developer page offers API documentation, code examples, an API playground, webhooks, and a Postman collection.Read 7 Oct 2026 · postalup.com
Downloads
PostalUp lists postal data downloads in CSV, JSON, Parquet, GeoJSON, and Shapefile formats, depending on the product.Read 7 Oct 2026 · postalup.com
Languages
The developer page shows examples or options for JavaScript, Python, PHP, Ruby, cURL, Go, and Java.Read 7 Oct 2026 · postalup.com
Usage limit
The pricing page says paid API plans continue serving requests through a 20% courtesy buffer past the monthly quota, after which requests pause until an upgrade or the monthly reset.Read 7 Oct 2026 · postalup.com
Use cases
The site lists e-commerce, real estate, logistics, marketing, insurance, and healthcare among its use cases.Read 7 Oct 2026 · postalup.com

Plans and prices

Free to Try Free 1,000 requests, never expires 1,000 requests · 10 requests/min · address standardization · basic validation · email support Read 7 Oct 2026 · postalup.com
ZIP Code Database Basic $19 a year Your Price:$19/year 4 core fields · 40,000+ ZIP codes · annual updates · CSV, TSV, JSON, SQL Read 7 Oct 2026 · postalup.com
Starter $29 a month $29/month 10,000 requests/month · 50 requests/min · ZIP+4 validation · batch processing Read 7 Oct 2026 · postalup.com
ZIP Code Database Standard $39 a year Your Price:$39/year 35 fields · coordinates and mapping · monthly updates · dashboard download access Read 7 Oct 2026 · postalup.com
ZIP Code Database Deluxe $79 a year Your Price:$79/year 63 fields · population and income data · metro area data · priority email support Read 7 Oct 2026 · postalup.com
Professional $99 a month $99/month 100,000 requests/month · 200 requests/min · batch and real-time processing · priority support Read 7 Oct 2026 · postalup.com
ZIP Code Database Business $129 a year Your Price:$129/year 110 fields · business and employment data · priority email support Read 7 Oct 2026 · postalup.com
Scale $299 a month $299/month 500,000 requests/month · 200 requests/min · batches up to 5,000 addresses · priority support Read 7 Oct 2026 · postalup.com
ZIP+4 Database Standard $299 a year Your Price:$299/year 38 fields · 190M+ addresses covered · 48.7M+ delivery ranges · building coordinates · dashboard access Read 7 Oct 2026 · postalup.com
Enterprise Priced on request Custom pricing based on your needs Unlimited requests · no rate limits · dedicated support · custom SLA · volume discounts Read 7 Oct 2026 · postalup.com

Every PostalUp plan and price →

Strong points and limits

Strong points

  • Free API plan includes 1,000 requests.
  • Supports batch and real-time address processing.
  • Provides examples in seven programming languages.
  • Downloads include CSV, JSON, Parquet, GeoJSON, and Shapefile.

Limits

  • International coverage is listed as local.
  • Paid API requests pause beyond a 20% quota buffer.
  • Redistribution to customers requires a redistribution license.

Who it suits

PostalUp suits developers and teams handling U.S. addresses in applications or bulk workflows. Its API and downloadable datasets address use cases such as e-commerce, logistics, real estate, insurance, and healthcare.

Verdict

PostalUp combines address validation with downloadable postal datasets and developer tools. Review request quotas and the redistribution terms if you plan to provide downloaded data to customers.

Where Specifiction places it

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