Why was Lemlist seeking a fraud prevention solution?

1. Free trial abuse: Lemlist offers a generous 14-day free trial to new users, which includes 500 data enrichment credits. Credits are used for email verification, phone number look-ups, and LinkedIn enrichment. Each credit is worth $0.01; henceforth, a free trial is $5 of value. 
2. Marketing channel strategy: A key reporting metric for any Product-Led Growth (“PLG”) company is conversion by acquisition channel. To ensure accurate reporting metrics, Lemlist needs to exclude fraudsters from its top of funnel calculations. With fake accounts in the funnel, Lemlist was unable to discern which channels to invest in. 

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What were they using before Verisoul? 

Lemlist monitored free trial usage behavior manually in the dashboard, but didn’t have any programmatic rules or real-time solutions in place when they discovered Verisoul. 

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What prompted their interest in a fraud prevention provider?

In early 2025, Lemlist faced a spike in fake free trials, which hampered conversion rates. Lemlist discovered Verisoul, who was working with analogous PLG software companies like Clay and Wiza. Verisoul was the obvious fit for preventing fake sign-ups, combining signals across 8+ point solutions into a single platform. Despite the robustness of the product, the integration was easy: Lemlist integrated Verisoul in less than an hour before the first demo call. 

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What does their workflow look like with Verisoul?

As a baseline, Lemlist uses Verisoul at sign-in to determine if a user is real or fake. The team also takes advantage of several custom configurations:

1. Rerouting fraudulent users: Verisoul tracks the number of “linked accounts” coming from each device; users with a high multi-accounting score get redirected back to the login page‍
2. IP blocking: Verisoul’s network intelligence and rules engine enables Lemlist to programmatically block certain high-risk IPs

In just six months since implementation, Verisoul has helped Lemlist block 38K fake accounts, equivalent to ~$190k in savings all for less than $10k. Although the 20x+ ROI may sound astronomical, the inputs are straightforward - Verisoul blocks fake trials, saving $5 in value for a few pennies. 

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In addition to the six-figure addition to their bottom line, the Lemlist team has peace of mind that their conversion metrics drive accurate insights by channel.