# Callsign

> Callsign is a digital trust platform for fraud prevention, authentication, and identity intelligence. Its Intelligence Engine combines behavioral biometrics, device fingerprinting, and telco/threat intelligence with an orchestration layer to recognize and authenticate users passively across login, payments, onboarding, and Zero Trust access.

This llms.txt was generated by the API Evangelist enrichment pipeline from the public Callsign developer surface. No public OpenAPI specification was captured (the API reference is served through a registration-gated Stoplight portal).

## Products

- Intelligence Engine — behavioral biometrics, device fingerprinting, telco intelligence, threat ensembling
- Orchestration Layer — dynamic interventions across customer journeys
- Authentication Suite (Callsign One) — passwordless, passive authentication

## Developer

- Developer resources: https://www.callsign.com/developers
- API documentation portal (Stoplight): https://docs.callsign.com/
- Authentication docs: https://docs.callsign.com/auth
- Integration & deployment: https://www.callsign.com/platform/integration-and-deployment
- Support: https://support.callsign.com

## Security

- security.txt: https://www.callsign.com/.well-known/security.txt
- Security & compliance (ISO/IEC 27001, SOC 2): https://www.callsign.com/security-and-compliance

## Company

- Home: https://www.callsign.com/
- Platform: https://www.callsign.com/platform
- News: https://www.callsign.com/news
- About: https://www.callsign.com/about
- Terms of Use: https://www.callsign.com/terms-of-use
- Privacy Notice: https://www.callsign.com/privacy-notice