# Plain

**Canonical:** https://apis.io/providers/plain/  
**Website:** https://www.plain.com/docs  
**APIs profiled:** 1

Plain is a customer support platform for B2B and technical SaaS companies, built entirely on its own public GraphQL API so there is full parity between what the product UI and the API can do. It unifies support across email, chat, Slack, and API-created threads, with customers, companies, tenants, tiers and SLAs, labels, help center articles, snippets, tasks, and events as first-class entities. Developers integrate via a Relay-style GraphQL API (bearer API keys with fine-grained permissions), typed TypeScript and Go SDKs, a CLI, customer-card UI components, HMAC-signed webhooks, a hosted MCP server, and an official agent skill. This profile was enriched from Plain's public developer surface.

## Kin Score — 56.1 / 100 (strong)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 56.1).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 63.0 |
| Governance | 3.1 |
| Operational Transparency | 44.7 |
| Developer Ergonomics | 80.4 |
| Commercial Clarity | 52.6 |

## Agent readiness — 49.5 (agent-ready)

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

## Access

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

## APIs (1)

- **Plain Core GraphQL API** — Plain's Core GraphQL API — the same API the Plain product is built on. Manage customers, companies, tenants, threads, messaging, help center, labels, tiers/SLAs, snippets, tasks...

## MCP servers (1)

- **plain-mcp.yml**

## Security (3)

- **Plain Authentication** — apiKey/oauth2/mutualTLS · 4 schemes
- **Plain Domain Security** — TLSv1.3 · HSTS · DMARC
- **Plain Trust Center** — trust center published

## Tags

Company, Customer Support, Customer Service, Help Desk, Support, SaaS, GraphQL, Webhooks, MCP, Developer Tools

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