# SIGNL4

**Canonical:** https://apis.io/providers/signl4/  
**Website:** https://www.signl4.com  
**APIs profiled:** 4

SIGNL4 is a mobile alerting and on-call duty management service that transforms emails, webhooks, and IoT events into reliable push, SMS, and voice alerts with acknowledgement tracking, escalation, and team on-call scheduling. The platform provides both an inbound webhook for sending alerts and a REST API for managing alerts, statuses, annotations, and team data. Authentication uses a team or webhook secret embedded in the URL path or supplied via the X-S4-Api-Key header.

## Kin Score — 34.2 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 34.2).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 56.1 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

## Agent readiness — 17.3 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| 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 | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

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

## APIs (4)

- **SIGNL4 Inbound Webhook API** — Simple HTTPS webhook endpoint for triggering mobile alerts in SIGNL4 from any monitoring, ITSM, or IoT tool. Accepts JSON payloads with Title and Message fields plus optional X-...
- **SIGNL4 REST API** — RESTful API for programmatic alert lifecycle management including creating events, acknowledging or closing alerts, annotating alerts, and retrieving team data. Authentication i...
- **SIGNL4 Events API** — The Events API from SIGNL4 — 1 operation(s) for events.
- **SIGNL4 Webhook API** — The Webhook API from SIGNL4 — 1 operation(s) for webhook.

## Agentic access (1)

- **Signl4 Agentic Access** — 2 operations · 2 acting

## Security (3)

- **Signl4 Authentication** — apiKey · 1 scheme
- **Signl4 Domain Security** — TLSv1.3 · DMARC
- **Signl4 Trust Center** — ISO 27001, GDPR

## Tags

Alerting, Incident Management, On-Call, Mobile Alerts, Notification, DevOps, IT Operations, Monitoring

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/signl4/). Scores are computed from the provider's own public artifacts under a published rubric.