Last updated 08-12-2026
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Prelude
Prelude gives developers a trust layer for user onboarding that combines SMS and OTP verification with device, network, and carrier fraud signals in one API decision. It blocks SMS pumping, bots, and fake signups before they hit your bill, then routes real users through SMS, WhatsApp, RCS, Telegram, or Viber across 230 regions.
Twilio and similar SMS APIs charge per message and leave fraud detection to you. Prelude prices per verification, passes carrier message costs at zero markup, and folds antifraud scoring into the signup flow. That matters when pumping attacks can inflate SMS bills overnight while conversion rates drop from aggressive CAPTCHAs.
Consumer apps with global signups use it to cut verification costs. Fintech teams pair it with risk-based step-up auth after the first login. Marketplaces running soft KYC at activation plug Prelude's Watch module into live behavioral signals without adding friction to every session.
Pay As You Go plan at 0.032 euros per verification with no commitment
Startup plan at 360 euros per month with advanced antifraud and Slack support
Zero markup on carrier message costs across SMS, WhatsApp, RCS, Telegram, and Viber
Covers 230 regions through 30 plus providers and 7 delivery channels
Claims 99 percent fraud reduction and 30 percent cost reduction versus prior providers
SOC 2 Type II and ISO 27001 certified with GDPR-ready European infrastructure
Modules for Verify, Auth, Watch, Intel, and Notify across the user lifecycle
Zero markup on carrier message costs across all delivery channels.
Fraud detection bundled into verification instead of bolted on separately.
Seven delivery channels including WhatsApp, RCS, Telegram, and Viber.
SOC 2 Type II and ISO 27001 certified European infrastructure.
Per-verification fees add up on high-volume apps beyond message costs alone.
Enterprise SLA and dedicated support require a custom sales conversation.
Pricing listed in euros; US developers need to check country-specific message rates.
What is Prelude?
Prelude is a developer platform for onboarding and trust infrastructure that unifies device, network, and signup signals into one verification decision. It provides OTP delivery, SMS pumping protection, and multi-channel authentication through a single API at prelude.so.
How much does Prelude cost?
Prelude offers a Pay As You Go plan at 0.032 euros per verification plus message costs, a Startup plan at 360 euros per month, and custom Enterprise pricing. Message fees are passed through at carrier cost with no markup on any plan.
Does Prelude have a free tier?
Yes, Prelude offers a Pay As You Go plan with no minimum commitment that developers can start through app.prelude.so/sign-up. Users pay per verification at 0.032 euros plus carrier message costs for the delivery channel used.
Which channels does Prelude support?
Prelude supports SMS, WhatsApp, RCS, Telegram, and Viber across 230 regions. The pricing page lists per-country message rates, with US SMS at 0.0043 euros and WhatsApp at 0.0028 euros as examples.
How does Prelude prevent SMS pumping fraud?
Prelude analyzes device, network, and carrier signals before sending verification codes to block SMS pumping, bots, and fake accounts. The platform claims 99 percent fraud reduction and routes only legitimate users through to message delivery.
Is Prelude compliant with security standards?
Yes, Prelude is SOC 2 Type II and ISO 27001 certified and describes its infrastructure as GDPR-ready and built in Europe. A Trust Center is available at trust.prelude.so with compliance documentation.
Does Prelude offer an API for developers?
Yes, Prelude provides REST APIs for verification, authentication, and transactional messaging documented at docs.prelude.so. Developers can send SMS via API, use the Transactional API, and integrate Verify, Auth, Watch, Intel, and Notify modules.