Powerful, Custom API Mailing

Build automated and flexible direct mail flows that fit your unique needs with Poplar’s API options.

API Mailing Overview

Build custom direct mail programs using Poplar’s custom API endpoints. Our API allows users to trigger, personalize, and track physical mail pieces with the same precision and automation they apply to email or push notifications. Marketers and developers can dynamically generate postcards, letters, and mailers at scale tailored to individual recipients based on real-time data. Access the speed, flexibility, and measurability that modern growth teams demand, unlocking direct mail as a fully integrated channel within any omnichannel marketing stack.

Pool Schedules Endpoints

Mailing

Easily target individual customers with timely 1-1 event driven mailings created directly from data sent via API.

Creative

Generate new creative for use with upcoming mailings through our new creative API endpoint.

Orders

Report customer transactions as they happen to power real-time attribution reporting, update audiences, and build suppression lists.

Audience

Create and update audiences in real time for use in campaign targeting or suppression lists.

The best API for brands that want flexibility, reliability & performance.

Full-Funnel Automation

Trigger mailings, manage creative, and submit orders to track attribution all from Poplar's endpoints.

1:1 Personalization at Scale

Pass any first-party data to dynamically personalize every piece, including names, offers, images, and more.

Risk-Free Testing

Develop and validate your integration with a dedicated test key. Full creative previews and data processing at no cost.

Full-Service Support

Our dedicated technical account team is here to support your team with any integration needs.

“Poplar’s API has been groundbreaking for our direct mail efforts, allowing us to build fully custom campaigns that are directly integrated with our marketing stack.”

Direct Integrations

In addition to Poplar’s custom API, we’ve built custom direct integrations with dozens of top ESPs, CRMs, and other Martech platforms.

Klaviyo is a marketing automation and email platform designed to help grow your business.

Shopify is the ecommerce platform that has everything to get you selling online, on social media, or in person.

Braze is a customer engagement platform that delivers messaging experiences across platforms.

Marketing automation from Salesforce. Deliver cross-channel personalized experiences at every step of the customer lifecycle.

All Integrations