Fake signups are no longer a fringe problem. Prelude, a Paris-based verification and trust infrastructure startup, just closed a $20M Series A to solve one of the most persistent pain points in digital onboarding: knowing whether the person, or agent, on the other end of your signup flow is actually real.
The round was led by 20VC, with participation from existing investors Singular, Seedcamp, Deel, and FDJ UNITED Ventures. This brings Prelude’s total funding to $27M since founding.
Growth That Backs the Vision:
Prelude grew revenue 6x and expanded its customer base 6x over the past year. Companies like BeReal, Sunday, Suno, and Voodoo already rely on it for user verification, specifically for the moments where users decide whether to stay.
That growth reflects a real shift in how product teams are thinking about onboarding fraud prevention. Teams aren’t just looking for an OTP vendor anymore. They’re replacing legacy providers, consolidating multiple tools, and treating fraud as a product problem, not an IT checkbox.
The Problem With Legacy Verification:
Running a clean onboarding flow today usually means stitching together a verification API, a fraud scoring vendor, an identity provider, and a device signals SDK. Each one has its own contract, its own blind spots, and its own integration overhead.
Prelude was built to replace that patchwork. Its Verify API handled phone verification with intelligent routing, carrier-level checks, and machine learning fraud detection. But the founding team, who built consumer apps before starting Prelude, knew a single check isn’t enough anymore.
Industry projections suggest bots will represent a greater share of online traffic than humans by 2027, with most of that traffic being AI agents acting on behalf of real users. A CAPTCHA won’t catch that. A phone OTP alone won’t either.
From Verify API to Full Trust Platform:
Alongside the funding announcement, Prelude is launching two new products that extend its platform well beyond phone verification.
Auth API gives product teams control over the user lifecycle after verification. Teams can track active sessions, revoke access instantly, and run continuous trust checks throughout a session, not just at signup. A user who passed verification at signup but starts showing bot behavior later gets flagged before it affects metrics or revenue.
Intel API brings carrier-grade intelligence directly into onboarding flows. Developers can query SIM status, number reputation, and connection quality in real time. This adds a trust signal that lives entirely at the network level, with no friction added to the user experience.
Prelude is also releasing a Watch API, a standalone anti-fraud product built from its experience fighting SMS pumping fraud. It turns that detection logic into a customizable fraud prevention model tailored to each business.
Together, these products cover the full arc of user onboarding: from the first device signal, through phone verification, all the way to session lifecycle management. One integration, one trust profile.
What the $20M Funds:
The capital goes into four areas: deeper telco partnerships with direct carrier routes in more markets, expanded Intel API coverage across Europe, continued machine learning model development for trust scoring, and new hires across engineering, telco partnerships, and customer success.
Paul Bonnet, General Partner at 20VC, pointed to a specific problem Prelude is solving that most verification providers ignore: “Most companies running phone verification get scammed by pump fraud, opaque pricing, and nonexistent customer support. Prelude’s customers are cutting verification costs by over 40%, converting more users, and actually getting a response when something breaks.”
The 40% cost reduction for customers is a concrete signal that this isn’t just infrastructure consolidation for its own sake. It’s replacing a category that has historically been opaque and expensive.
The Founders’ Perspective:
Co-founder Matias Berny put the core thesis plainly: “The phone number is becoming the strongest anchor we have, and with the Lookup API, it carries more trust than any password or one-time code ever did.”
Co-founder Quentin Le Bras framed the wider challenge: “No single signal can answer the question of whether this is a legitimate user anymore. The companies winning at onboarding will be the ones who treat trust as continuous infrastructure, not a one-time gate.”
Both quotes reflect a product philosophy that’s actually different from the typical verification vendor pitch: trust isn’t a step in the funnel, it’s a layer that runs underneath everything else.
A Platform Built for What’s Coming:
Prelude’s expansion from a phone verification API to a full user trust layer is a direct response to how onboarding is changing. AI agents completing signups on behalf of users, synthetic identities passing basic checks, and SMS pumping eating into verification budgets are all problems that single-point tools aren’t equipped to handle.
For founders and product teams building anything with a signup flow, Prelude is worth understanding as a category. The combination of behavioral anti-fraud, carrier intelligence, and session management in one platform replaces what used to require three or four vendors. If you’re evaluating your current phone verification API setup, this is a useful benchmark for what consolidated tooling looks like in 2026.
