Read docs Updated 2026-06-16
What is Lob.com?
Lob.com is a data API for verifying US addresses.
It supports applications that require accurate US address data.
What you can build with Lob.com
E-commerce checkout validation
Developers integrate Lob to verify shipping addresses at checkout, reducing undeliverable packages and cart abandonment.
CRM data cleansing
Teams use it to standardize and validate customer addresses in CRMs like Salesforce before running mail campaigns or updates.
Bulk mailing list preparation
Marketing platforms batch-verify address lists to improve deliverability rates for direct mail and postcards.
Get started with Lob.com
- 1Sign up at lob.com and generate an API key from the dashboard
- 2Read the Address Verification API docs for request format and parameters
- 3Make a POST request to the /v1/us_verifications endpoint with your API key
- 4Parse the JSON response for deliverability status and corrected address
- 5Handle errors and rate limits in your application code
Lob.com: pros & cons
Pros
- +USPS-sourced accuracy for US addresses
- +Fast responses with rich metadata
- +Supports single and bulk verification
- +Clear deliverability flags
Cons
- –US addresses only
- –Usage-based pricing after free tier
- –Requires handling of API rate limits
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Frequently asked questions
An API that checks and standardizes US addresses using USPS data to confirm deliverability.
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