Authsignal
Authsignal is a passwordless, step-up, and risk-based authentication platform. The product wraps passkeys, authenticator apps (TOTP), SMS and WhatsApp OTP, email OTP and magic links, push notifications, biometrics (face / palm), and ID verification behind a unified Server API, Client API, and Management API. A no-code rules engine routes high-risk events through step-up challenges, and audit / observability surfaces every authentication attempt. Authsignal slots in front of existing identity providers (Cognito, Auth0, Azure AD B2C, Keycloak, IdentityServer, NextAuth.js) or works standalone.
Authsignal publishes 16 APIs on the APIs.io network. Tagged areas include Authentication, Passkeys, MFA, Step-Up, and Passwordless.
Authsignal’s developer surface includes documentation, GitHub presence, status page, pricing, engineering blog, and 2 more developer resources.
APIs
Authsignal Server API
Server-to-server REST API used to track user actions, evaluate the rules engine, mint short-lived URLs for the pre-built authentication UI, issue client tokens, validate challen...
Authsignal Client API
Browser / device-facing REST API for fully custom authentication UIs. Supports passkeys, authenticator apps, SMS / WhatsApp OTP, email OTP, magic links, and push challenges. Aut...
Authsignal Management API
REST API for tenant-level configuration: actions and rules, theme and branding, and other tenant settings. Authenticated with a separate management API key.
Authsignal Webhooks
Outbound webhooks delivering authentication and enrollment events, enabling downstream systems to react to user lifecycle changes and challenge outcomes.
Authsignal Node.js SDK
Official server-side SDK for Node.js / TypeScript wrapping the Server API.
Authsignal Python SDK
Official server-side Python SDK for the Authsignal Server API.
Authsignal Java SDK
Official Java / Kotlin SDK for the Authsignal Server API.
Authsignal .NET SDK
Official C# / .NET SDK for the Authsignal Server API.
Authsignal Ruby SDK
Official Ruby SDK for the Authsignal Server API.
Authsignal PHP SDK
Official PHP SDK for the Authsignal Server API.
Authsignal Go SDK
Official Go SDK for the Authsignal Server API.
Authsignal Browser SDK
JavaScript / TypeScript browser SDK wrapping the Client API and WebAuthn / passkey ceremonies for web applications.
Authsignal iOS SDK
Native iOS (Swift) SDK for passkeys, push, and OTP challenges in iOS applications.
Authsignal Android SDK
Native Android (Kotlin) SDK for passkeys, push, and OTP challenges in Android applications.
Authsignal React Native SDK
React Native wrapper around the iOS and Android SDKs.
Authsignal Flutter SDK
Flutter (Dart) SDK wrapping the iOS and Android native SDKs.