7 Best APIs for Authentication in Nigeria

Real-time NIN authentication service for secure digital identity verification. NINAuth allows services to verify citizens' identities without exposing actual NIN data. Supports web, API, and mobile verification with enhanced security and privacy protection.

Termii is a Nigerian-founded communications API platform delivering SMS, voice OTP, email, and WhatsApp messaging with a primary focus on serving Nigerian and African businesses who need the highest possible delivery rates for transactional messages to Nigerian mobile subscribers. As a company founded in Lagos and built by Nigerians, Termii has developed specialized expertise in Nigerian carrier OTP delivery — particularly the DND bypass routing for transactional messages that is critical for fintech, healthcare, and authentication applications where OTP delivery failure means user lockout and abandoned transactions. The Termii SMS API reaches all four Nigerian mobile networks (MTN, Airtel, Glo, 9mobile) with NGN-denominated pricing and delivery infrastructure optimized for the Nigerian telecom environment. Termii's routing intelligence distinguishes between message types — automatically applying transactional routes that bypass DND for OTPs and critical notifications, while routing promotional messages through standard channels with DND compliance. This automatic routing optimization reduces developer complexity and ensures the right delivery path is used for each message type. OTP delivery is Termii's core product and competitive strength. Termii Token — their OTP management API — provides a complete managed verification flow: request a token, Termii generates and sends it via SMS or voice, the developer submits the user-entered code to verify. Termii handles code generation, expiry (configurable 1-60 minutes), multi-channel fallback, and verification logic. Nigerian fintech apps, e-commerce platforms, and healthcare systems can integrate Termii Token to implement secure phone verification without building any OTP infrastructure themselves. Voice OTP through Termii calls the recipient's Nigerian number and reads the code via text-to-speech. This is deployed as an automatic fallback when SMS OTP fails to deliver within the configured timeout — Termii's system can automatically retry via voice call if SMS delivery is not confirmed. For Nigerian banking apps where every failed OTP leads to a lost transaction or a customer service call, the voice fallback measurably improves verification success rates. WhatsApp Business messaging through Termii enables sending WhatsApp template messages to Nigerian customers — order notifications, delivery updates, account alerts, and OTP codes through WhatsApp. Termii's WhatsApp API integration means Nigerian businesses can add WhatsApp to their notification channels without a separate Meta Business API engagement. WhatsApp delivery of OTPs achieves extremely high open rates compared to SMS in Nigeria, where WhatsApp notifications are typically checked within minutes. Email notifications through Termii cover transactional email delivery for Nigerian applications — verification emails, password resets, system alerts, and notification messages. The Termii API supports HTML and plain text email, with sender domain customization for branded from-addresses. Termii provides a developer sandbox for testing API calls against simulated Nigerian network responses without real delivery costs, enabling Nigerian developers to build and test complete notification flows before going live. SDKs are available for JavaScript, Python, and PHP. Pricing is freemium with a free trial credit and paid plans in NGN for production use. Termii's developer sandbox environment and comprehensive API documentation make it one of the easiest Nigerian communications platforms to onboard, with support available through their Lagos-based team. Nigerian fintech startups consistently rate Termii as the top Nigerian-specific OTP delivery solution for their authentication infrastructure.

LoginRadius is a Customer Identity and Access Management (CIAM) platform that provides a comprehensive suite of APIs and SDKs for managing the complete user identity lifecycle — from registration and login through profile management, consent collection, and account deletion. Unlike lightweight authentication libraries that only handle login, LoginRadius covers the full breadth of identity management that production consumer and enterprise applications need: social login aggregation, multi-factor authentication, single sign-on across multiple applications, progressive profiling, consent management for privacy compliance, and user behavior analytics. For Nigerian developers building scalable applications that need robust identity infrastructure, LoginRadius provides enterprise-grade CIAM at startup-friendly pricing. Nigeria's digital economy operates under increasing identity and privacy regulatory pressure. The Nigeria Data Protection Regulation (NDPR) requires organizations to obtain valid consent before processing personal data, provide users with access to their data, and delete data upon request. The Central Bank of Nigeria (CBN) requires financial applications to implement multi-factor authentication and maintain audit trails of user access. LoginRadius's built-in consent management, MFA support, and user data export features help Nigerian companies meet these regulatory requirements without building compliance infrastructure from scratch. Social login integration covers over 40 social providers — Google, Facebook, Apple, LinkedIn, Twitter, GitHub, and many more — enabling Nigerian applications to offer "Sign in with Google" and similar buttons without integrating each provider separately. LoginRadius handles the OAuth flows, token management, and profile data normalization for every provider. For Nigerian consumer apps where social login can significantly increase signup conversion rates (users avoid creating yet another password), this breadth of social provider support is highly valuable. Progressive profiling allows Nigerian applications to collect user information incrementally over multiple interactions rather than demanding everything at signup. A Nigerian e-commerce platform might collect only email and name at registration, ask for phone number after the first purchase, and request address only when the user first initiates a delivery. LoginRadius manages the data collection rules and ensures each profile field is only requested once, reducing signup friction while building complete user profiles over time. Single Sign-On (SSO) enables users to authenticate once and access multiple connected applications without signing in again. Nigerian tech companies with multiple products — a consumer app, a merchant portal, and an admin dashboard — can use LoginRadius SSO so that users who are logged into one application are automatically authenticated in all others. LoginRadius supports SAML, JWT, and OAuth-based SSO protocols. The User Analytics dashboard provides Nigerian product teams with insights into registration conversion rates, login method preferences, active user counts, and geographic distribution of users. Understanding what percentage of Nigerian users choose Google login versus email signup helps product teams optimize their authentication UX. The free tier supports 3,000 monthly active users with core functionality including social login and email authentication — sufficient for Nigerian startups in early stages. SDKs are available for 30+ frameworks and languages including JavaScript, React, Angular, Vue, Node.js, PHP, Python, iOS, and Android.

Stytch is a modern authentication platform that specializes in passwordless authentication flows — magic links, OTPs (one-time passwords) via SMS, WhatsApp, email, and phone, passkeys, and OAuth social login — providing Nigerian developers with a comprehensive authentication API that covers the full range of modern login patterns without requiring teams to build authentication infrastructure from scratch. Stytch also provides session management, multi-factor authentication, and B2B authentication (SSO, SCIM) through a unified platform. Nigerian applications face a distinctive authentication challenge: the user population is highly mobile-first, WhatsApp is the dominant communication platform, SMS is near-universally accessible, and passwords are widely considered a poor user experience due to reuse, forgetting, and the inconvenience of password managers. Nigerian fintech and consumer apps benefit enormously from passwordless authentication patterns that reduce friction and improve conversion — a user who can log in with a single SMS code is far more likely to complete onboarding than one who must create and remember a password. Magic links send users a single-use authentication link to their email. When the user clicks the link, they are instantly authenticated in the app without ever entering a password. For Nigerian SaaS and e-commerce applications where users have reliable email access, magic links are the simplest and most frictionless authentication flow available. Stytch's magic link endpoint handles link generation, delivery, verification, and session creation with a few API calls. SMS OTP (one-time password) sends a 6-digit code to the user's phone number via SMS. This is the most familiar authentication pattern for Nigerian users, who regularly receive OTPs from banks, fintech apps, and telecommunications companies. Stytch's SMS OTP supports Nigerian phone numbers in E.164 format (+234...), making it straightforward to authenticate Nigerian users with their mobile numbers. WhatsApp OTP is a unique Stytch capability that delivers authentication codes via WhatsApp rather than traditional SMS. With WhatsApp used by over 80% of Nigerian smartphone users, WhatsApp OTP feels more familiar and accessible than SMS for many Nigerians — particularly for users whose SMS inbox is noisy with promotional messages. This is a significant differentiator for Nigerian consumer apps targeting the mass market. Passkeys (WebAuthn) represent the future of authentication — users authenticate using biometrics (fingerprint, face ID) stored on their device rather than any password or code. For Nigerian mobile apps where users are accustomed to fingerprint authentication in their banking apps, passkey support provides a seamlessly secure login experience. Stytch's passkey implementation handles the complex WebAuthn protocol on the server side, exposing a simple enrollment and authentication API. The free tier supports up to 25 monthly active users — sufficient for development and small-scale testing. Startup plans ($249/month) support production scale for most Nigerian applications in early growth stages. Complete SDKs for React, Next.js, React Native, iOS, and Android simplify frontend integration. Stytch's fraud prevention features include device fingerprinting, IP reputation scoring, and behavioral analysis that identify suspicious authentication activity — account takeover attempts, credential stuffing attacks, and bot-driven registration campaigns. For Nigerian fintech and e-commerce applications that face significant fraud risk, these built-in fraud signals supplement application-level fraud detection without requiring a separate fraud prevention service. The Stytch B2B authentication product extends the platform to enterprise use cases with organization-level user management, just-in-time provisioning, and SCIM directory synchronization. Nigerian B2B SaaS companies building for enterprise clients can use Stytch B2B to implement the enterprise authentication features (SSO, organization management, role-based access) that enterprise procurement teams require.

Popular global cryptocurrency exchange with strong presence across Africa including Nigeria. Luno provides trading APIs, market data endpoints, and wallet integrations for developers. Good for applications needing crypto trading capabilities and market data integration. Supports both beginner and advanced traders.