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Direct mail
APIs designed for developers

Extend your applications into the physical world with automated direct mail and powerful address data—delivered through cloud-based APIs.

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Powerful APIs built for scale

Lob’s Print & Mail APIs and Address Verification APIs allow you to easily integrate offline communications into your apps, internal systems, or marketing stack. Flexible scalability allows you to send 100 or 100 million mailpieces in minutes.

Read our API documentation

Transform outdated, manual processes with Lob’s easy-to-integrate APIs

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Integrate with RESTful APIs to streamline workflows for direct mail, address data, and identity verification at scale

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Trigger postcards, self mailers, letters, and checks on demand directly from your CRM or custom applications

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Leverage Lob's scalable on-demand Print Delivery Network to create and send mailpieces more efficiently

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Hyper-personalize content programmatically

Connect to sources of customer data including marketing automation platforms and CRMs to tailor messaging for each individual

Update dynamic content with HTML templates and merge variables

Include offer codes, unique URLs, or QR codes to track ROI

Get visibility in every step of the direct mail process

Track every mailpiece with powerful webhooks

Report on real-time and historic mail statuses for compliance audits

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Meet compliance requirements with
smart webhooks

Our industry-leading security is trusted by Fortune 500 companies and is built into every aspect of Lob.

SOC 2 Type 2 and HIPAA, and GDPR compliant

Signed webhooks with HMAC signatures

Protect personal data with end-to-end encryption and scheduled deletion

Report on real-time and historic mail statuses for compliance audits

Modern SaaS technology

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Modern SDKs in programming languages like PHP, Python, Ruby, Java, Elixir, TypeScript, and C#/.NET

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Explore Lob APIs with REST clients (Postman and Insomnia)

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UI libraries and components in JavaScript frameworks like React & Vue

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Integrate through low-code, no-code solutions like Zapier and Make, or popular marketing & workflow automation tools like Salesforce, Braze, Iterable, and Hubspot

Get our most popular developer resources

API documentation
Quickstart guide
SDK and client libraries
Use cases
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We were amazed with how well written Lob Address Verification API is; the codes are super constrained and understandable. It only took 30 minutes for us to explain to our engineers how we wanted this to run, and they didn’t even have a single question.

Jane Smith

Position Title, Lob

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Direct mail automation resources for insurance providers

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eBook

Modernizing Direct Mail Communications: A Fireside Chat With Oscar Health

Gain insight into how Oscar Health implements technology in a way that best serves their organization’s needs, not just immediately, but in the long term.

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eBook

Running a Tactical Direct Mail Campaign

Learn how to create powerful direct mail campaigns that will deliver high response rates, more customers, and more revenue in our mini tactical guide.

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eBook

The Modern Marketer’s Guide to Direct Mail Analytics & Testing

Download the guide to master modern direct mail analytics and testing to increase the ROI of your direct mail campaigns.

Read eBook