Communications Platform · Sales, Marketing & CX
Should you build or buy Identity Verification & 2FA?
Identity verification and two-factor authentication software provides the tools companies need to confirm that users are who they say they are — through OTP delivery via SMS or email, authenticator app codes, hardware keys, or biometric document verification. It spans everything from simple login MFA to full KYC workflows that check government IDs and match faces against them.
The build-vs-buy decision for Identity Verification and 2FA splits on which part of the stack you mean: OTP and TOTP are commodity infrastructure that's routinely self-built, while document-based KYC involves certified liveness detection and regulatory attestations that are genuinely hard to replicate; the specifics decide it.
Build it, buy it, or bridge?
When building makes sense
Two-factor authentication using TOTP, WebAuthn, or passkeys is straightforwardly self-built. The libraries are mature (python-otp, speakeasy, WebAuthn4J), the protocols are open standards, and there's no compliance certification required to issue and validate authenticator app codes. Many teams build this layer directly into their auth system. Passkeys are increasingly reducing the role of SMS OTP altogether — products adopting FIDO2-based authentication can largely bypass per-verification fees. For companies where security is part of the brand, owning this layer can make sense. Where the self-build ceiling hits is at document-based identity verification: iBeta PAD certification for liveness detection, global document libraries, AML compliance attestations, and ongoing deepfake defense are not things a product team builds from scratch. That's a vendor problem.
When buying makes sense
Full KYC document verification — checking a government-issued ID, matching it to a selfie, confirming liveness — requires compliance certifications that commercial vendors carry as their primary product. Persona, Onfido, and Telesign have iBeta certification for liveness, global document coverage, and the regulatory infrastructure to support KYC/AML obligations. Building equivalent capability independently is not a realistic option for most teams, including those in regulated industries who need it most. For SMS OTP delivery specifically, buying from Twilio Verify, Infobip, or alternatives is straightforward and cost-controlled. The cost story is shifting as passkeys reduce OTP volume, but in the meantime, managed verification services provide the compliance coverage most products need without the certification overhead.
The desk read
Two-factor authentication splits into two very different problems. OTP delivery and TOTP are commodity, and building that layer on top of standard libraries and a messaging API is routine. Full KYC document verification is a different story. Platforms like Persona and Onfido carry iBeta PAD certification for liveness detection, global document libraries, and regulatory compliance attestations. Building those capabilities independently is rarely justified outside regulated financial services.
The cost picture is shifting. Passkeys and FIDO2 are reducing dependence on SMS-based OTP entirely, which structurally removes a major cost center for high-volume senders. Carriers like Plivo and Telnyx undercut Twilio Verify on per-verification pricing. Buying earns its keep most clearly on the document verification side, where the compliance and deepfake defense requirements are genuinely hard to replicate. For pure OTP delivery, the question is which vendor or channel to use.
Frequently asked
What is Identity Verification & 2FA?
Identity verification and two-factor authentication software provides the tools companies need to confirm that users are who they say they are — through OTP delivery via SMS or email, authenticator app codes, hardware keys, or biometric document verification. It spans everything from simple login MFA to full KYC workflows that check government IDs and match faces against them.
When does building Identity Verification & 2FA make sense?
Building makes sense for the simpler MFA layers — TOTP, WebAuthn, passkeys — where open-standard libraries handle the heavy lifting. As products shift toward passkeys, the self-build case strengthens further because it structurally removes SMS OTP costs. Document-based KYC is a different story.
When does buying Identity Verification & 2FA make sense?
Buying makes sense for any product requiring document verification or regulated KYC, where iBeta liveness certification and AML compliance attestations are required. For SMS OTP at scale, vendors offer managed delivery with built-in compliance and carrier relationships.
What are the main Identity Verification & 2FA vendors?
Representative vendors include Infobip 2FA, Telesign, Twilio Verify, Persona. B4 Pro scores the full set.
How are passkeys changing the identity verification market?
Passkeys (FIDO2/WebAuthn) let users authenticate with a device biometric instead of a one-time code, eliminating SMS OTP costs entirely. Companies like HubSpot have documented significant OTP spend reduction after passkey adoption, and the standard is now broadly supported across iOS, Android, and major browsers.