aid: signl4
name: SIGNL4
description: >-
  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.
type: Index
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Alerting
  - Incident Management
  - On-Call
  - Mobile Alerts
  - Notifications
  - DevOps
  - IT Operations
  - Monitoring
url: >-
  https://raw.githubusercontent.com/api-evangelist/signl4/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
  - aid: signl4:inbound-webhook
    name: SIGNL4 Inbound Webhook API
    description: >-
      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-S4 control parameters for
      service categorization, location, alerting scenario, and external
      identifiers. Authentication uses a unique team or webhook secret
      embedded in the URL path.
    humanURL: https://docs.signl4.com/integrations/webhook/webhook.html
    baseURL: https://connect.signl4.com/webhook
    tags:
      - Webhook
      - Inbound
      - Alerting
      - Mobile Push
    properties:
      - type: Documentation
        url: https://docs.signl4.com/integrations/webhook/webhook.html
      - type: API Reference
        url: https://connect.signl4.com/webhook/docs/index.html
      - type: Code Samples
        url: https://github.com/signl4/code-snippets
  - aid: signl4:rest-api
    name: SIGNL4 REST API
    description: >-
      RESTful API for programmatic alert lifecycle management including
      creating events, acknowledging or closing alerts, annotating alerts,
      and retrieving team data. Authentication is via X-S4-Api-Key header
      with the team or webhook secret.
    humanURL: https://docs.signl4.com/integrations/rest-api/rest-api.html
    baseURL: https://connect.signl4.com/api
    tags:
      - REST
      - Alert Management
      - Events
      - Incident Response
    properties:
      - type: Documentation
        url: https://docs.signl4.com/integrations/rest-api/rest-api.html
      - type: Overview
        url: https://www.signl4.com/webhook-rest-smtp-api-integration/
      - type: Code Samples
        url: https://docs.signl4.com/samples/code-samples/code-samples.html
common:
  - type: Website
    url: https://www.signl4.com
  - type: Documentation
    url: https://docs.signl4.com
  - type: Pricing
    url: https://www.signl4.com/pricing/
  - type: Sign Up
    url: https://account.signl4.com/register
  - type: Support
    url: https://support.signl4.com
  - type: Blog
    url: https://www.signl4.com/blog/
  - type: GitHub
    url: https://github.com/signl4
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com