# CallSign

**Canonical:** https://apis.io/providers/callsign/  
**Website:** http://www.callsign.com  
**APIs profiled:** 0

Callsign is a digital trust platform for fraud prevention, authentication, and identity intelligence. Its Intelligence Engine combines behavioral biometrics, device fingerprinting, telco intelligence, and threat ensembling with an orchestration layer that applies dynamic interventions across customer journeys - login and access, online payments, account creation, and Zero Trust network access - to recognize and authenticate users passively. The Authentication Suite (Callsign One) delivers passwordless, low-friction authentication, and the platform targets account takeover, social engineering and scams, malware and bots, SIM swap, call divert, and synthetic identity. Callsign integrates via REST APIs and web and mobile SDKs, and is certified to ISO/IEC 27001 with SOC 2 attestation. Added to the API Evangelist network from the Accel portfolio and enriched from Callsign's public developer surface.

## Kin Score — 22.7 / 100 (emerging)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 22.7).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 41.3 |
| Commercial Clarity | 36.8 |

## Agent readiness — 11.7 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (3)

- **Callsign Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Callsign Vulnerability Disclosure** — security.txt · contact published
- **Callsign Trust Center** — ISO/IEC 27001, SOC 2

## Tags

Company, Ai, Identity, Authentication, Fraud Prevention, Behavioral Biometrics, Security, Fintech

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/callsign/). Scores are computed from the provider's own public artifacts under a published rubric.