# OneSignal

**Canonical:** https://apis.io/providers/onesignal/  
**Website:** https://onesignal.com/  
**APIs profiled:** 6

OneSignal is a lifecycle customer engagement platform for mobile push, web push, email, SMS/RCS, in-app messaging and iOS Live Activities, orchestrated through Journeys, segments and a single REST API at api.onesignal.com. It reports 1.3 trillion messages a year across 200k apps and 1.5 billion monthly active users. The developer surface is a published OpenAPI 3.1 contract, a full set of first-party server and client SDKs, a hosted OAuth-authenticated MCP server, an A2A agent card and six provider-published Agent Skills.

## Kin Score — 78.8 / 100 (exemplar)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 78.8).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 76.5 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 84.2 |
| Developer Ergonomics | 78.6 |
| Commercial Clarity | 93.4 |
| Access Clarity | 93.4 |

Regulatory layer — **Telecommunications**: 50.0 (matched via tags).

## Agent readiness — 56.7 (agent-native)

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

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (6)

- **OneSignal REST API** — The complete OneSignal REST API as OneSignal publishes it — OpenAPI 3.1.0, info.version 11.6, 39 paths and 59 operations covering messaging, users, subscriptions, segments, temp...
- **OneSignal Apps API** — The Apps API from OneSignal — 21 operation(s) for apps.
- **OneSignal Notifications API** — The Notifications API from OneSignal — 4 operation(s) for notifications.
- **OneSignal Players API** — The Players API from OneSignal — 1 operation(s) for players.
- **OneSignal Templates API** — The Templates API from OneSignal — 3 operation(s) for templates.
- **OneSignal MCP Server** — OneSignal's hosted Model Context Protocol server at https://api.onesignal.com/mcp/oauth, connected over browser-based OAuth 2.1 with PKCE. Listed in the Cursor marketplace and C...

## MCP servers (1)

- **OneSignal MCP** — OneSignal ships two distinct remote MCP servers. The product server at api.onesignal.com/mcp/oauth is the one Cursor, Claude, Copilot and ChatGPT connect to; it is OAuth-gated, ...

## Security (4)

- **Onesignal Authentication** — http/oauth2 · 3 schemes
- **Onesignal Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Onesignal Vulnerability Disclosure** — security.txt · contact published
- **Onesignal Trust Center** — SOC 2 Type II, ISO 27001, ISO 27701, EU-U.S. Data Privacy Framework

## Plans (1)

- **Onesignal Plans Pricing**

## Tags

Notification, Push, Email, SMS, Mobile, Push Notifications, Web Push, Customer Engagement, Marketing Automation, Live Activities, RCS, In-App Messaging, Journeys, Lifecycle Marketing, MCP, Agent Ready

---

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