The Best Way to Ensure Lead Authenticity

Accurate Append’s lead validation is the most definitive tool available to solve the number one problem for online marketers – “is my lead good or bad?” Accurate Append will provide the answer in the form of actionable data in a matter of seconds.

Instantly Research Your Prospects

We’ll tell you whether an email address is real, and enhance incomplete leads by adding name, phone number, age, email address and U.S. postal address — from minimal or incomplete form data. Actionable customer intelligence, in seconds.

Expert Support and Advice

We specialize in deep, long-lasting support customized to your needs. Your success and growth are our business model, and we’re building the products and custom solutions to prove it.

Lead Validation & Enhancement Solutions

All solutions listed below are available 24/7/365 as a Batch Service or real-time API.


Reduce bounces and flag spam and fraud. Verify your email addresses, in real time, before you act.


Validate, verify and enhance leads in real-time. Enhance your leads with fresh emails and phone numbers.


Use our demographic append API to enhance your database with demographic attributes.

Reverse Append

Discover full name and US postal address with as little as an email address or phone number.


Append and score cell phone and landline quality with Authoritative Data Source phone append.


Append verified deliverable email addresses in real time with AccuSend email append.

Customized to Fuel Your Success

SOC 2 and HIPAA compliant, we offer custom solutions for regulated industry and fast-growing startups alike. Our proven technology stack supports customizations and quick deployment to accelerate your projects and campaigns.

Call us at 888-979-9813 for a free consultation

Notable Partners

Easy Integrations

Integration is easy with RESTful architecture, full documentation and codes samples.

Available Where You Need It

Cloud based RESTful API interface or Batch Service can be accessed from anywhere.

Compare Our Results

With the highest possible uptime and fastest response times the service will always be available when you need it.

Top Data Logistics, Built for You

We combine the best available public data with curated, proprietary databases to give you the best, most reliable data possible.