# Tessian

**Canonical:** https://apis.io/providers/tessian/  
**Website:** https://www.tessian.com  
**APIs profiled:** 10

Tessian, now part of Proofpoint, is an AI-powered email security platform that protects against inbound threats (phishing and impersonation), accidental data loss, and deliberate data exfiltration across its Defender, Guardian, Enforcer, Architect, and Constructor modules. The Tessian API is a RESTful, JSON, read-oriented interface that exports security-event, anomaly, company-risk, user-monitoring, audit-log, and trigger data into SIEMs and other data-management tools. It authenticates with a static API token, paginates by checkpoint, and returns ISO 8601 UTC timestamps.

## Kin Score — 35.8 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 35.8).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 52.9 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 44.6 |
| Commercial Clarity | 10.5 |
| Access Clarity | 10.5 |

## Agent readiness — 40.0 (agent-ready)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (10)

- **Tessian Anomalies API** — Endpoints in this section detail anomalous user activity that has been detected by the system, where anomalous activity is defined as users sending unusual numbers of sensitive ...
- **Tessian Audits API** — Endpoints in this section allow you to access audit information of usage and changes made to your Tessian Products.
- **Tessian Beta Endpoints API** — The Beta Endpoints API from Tessian — 1 operation(s) for beta endpoints.
- **Tessian Deprecated API** — **⚠️ These endpoints are marked as deprecated and will be going away soon.** You should look to migrate away from using the endpoints in this section as they are no longer maint...
- **Tessian Endpoints API** — The Endpoints API from Tessian — 9 operation(s) for endpoints.
- **Tessian Events API** — Endpoints in this section allow you to access security events from Tessian.
- **Tessian Groups API** — Groups are named collections of email addresses; their members may be specified either by specific address, or by a wildcard including all addresses in an entire domain.
- **Tessian Monitoring API** — Endpoints in this section provide ways to monitor information in Tessian.
- **Tessian Risk API** — Endpoints in this section expose risk drivers, which are the underlying components for the Tessian combined Risk Score.
- **Tessian Triggers API** — The Triggers API from Tessian — 1 operation(s) for triggers.

## MCP servers (1)

- **Tessian MCP Server**

## Agentic access (1)

- **Tessian Agentic Access** — 13 operations · 5 acting

## Security (2)

- **Tessian Authentication** — apiKey · 1 scheme
- **Tessian Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Enterprise, Email Security, Cybersecurity, Data Loss Prevention, SIEM, Security, Phishing

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