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PostalUp is a U.S. address data service aimed at developers and data teams. Its core offerings include an address standardization API, downloadable 5-digit ZIP Code databases, and more granular ZIP+4 datasets. The site emphasizes that its data comes from USPS ZIP+4 and is refreshed monthly, making it suitable for use cases that depend on high-quality U.S. address data, such as ecommerce, logistics, marketing, real estate, and insurance.
On the API side, PostalUp provides a /api/standardize address standardization endpoint, authenticated with a Bearer API Key, along with Python, curl, and TypeScript examples. The Python example uses the postal-tools package. For data products, it supports downloads in CSV, TSV, JSON, and SQL formats, which can be imported into your own database. The ZIP Code dataset includes 40,000+ ZIP codes, coordinates, time zones, population, income, business, and other fields. The ZIP+4 product covers 150M+ address ranges, 9-digit ZIP codes, carrier routes, building-level coordinates, Census geography, and more.
The API free tier includes 10,000 queries per month with no credit card required. The Starter plan is $29/month for 50,000 queries, while the Professional plan is $99/month for 500,000 queries; enterprise volume requires contacting sales. ZIP Code data is priced annually from $19 to $129, while ZIP+4 ranges from $299 to $699. Most data products offer dashboard downloads, monthly updates, and a 7-day money-back guarantee. Education and nonprofit discounts are also disclosed.
The main advantages are transparent pricing, a generous free quota, simple getting-started examples, and a wide range of downloadable data formats, making it easy to integrate offline or into internal systems. Its USPS data, updated monthly, has practical value for U.S. address validation, tax jurisdiction handling, and logistics planning. The downsides are that the text does not clarify whether it is open source, whether self-hosted software is available, payment methods, SLA, rate limits, or a complete set of error codes. Some industry pages contain repetitive marketing content, and the documentation appears somewhat limited in depth. The service is also clearly focused on U.S. addresses, so it is not suitable for teams that need global address standardization.
PostalUp is best suited for cross-border ecommerce, U.S.-based logistics, SaaS form validation, CRM data cleansing, and real estate or insurance data analysis teams. Access from China is not described in the available text, so its status is unknown. For China-based development teams, network connectivity, credit card payment, and invoicing workflows should be tested in practice. Alternatives to compare include Smarty, Melissa, Loqate, and Google Maps Geocoding/Places API.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on postalup.com official site.
postalup.com is an United States API & Data provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach postalup.com directly.