# SMS Assist

**Canonical:** https://apis.io/providers/sms-assist/  
**Website:** https://www.lessen.com/  
**APIs profiled:** 2

SMS Assist (rebranded as Lessen) is a facilities maintenance, repair, and work-order management company. Its "One" Platform coordinates reactive and recurrent maintenance, turn/renovation projects, invoices, proposals, assets, and a nationwide vendor network for residential and commercial properties. Lessen exposes the platform through the One Open API v2 — a GraphQL API split into a Client surface (property owners/managers create and track work orders, residents, locations, invoices, and Turn/Reno projects) and a Vendor surface (affiliate technicians manage assets, communications, and work orders) — plus a rich webhook event catalog, SSO/SCIM provisioning, and isolated sandbox and production environments. The legacy REST Open API v1 and Affiliate API v1 were sunset in favor of the v2 GraphQL platform.

## Kin Score — 44.3 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 44.3).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 45.1 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 61.3 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

## Agent readiness — 33.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | yes |
| Agent Skills | derived |
| 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 (2)

- **One Open API v2 - Client** — GraphQL API for clients (property owners and managers) to create and track reactive and recurrent work orders, residents, locations, service requests, invoices, proposals, Turn/...
- **One Open API v2 - Vendor** — GraphQL/HTTP API for vendors and affiliate technicians to manage assets (service and location assets), attachments, communications and messages, client lists, employees, locatio...

## MCP servers (1)

- **SMS Assist MCP Server**

## Security (2)

- **Sms Assist Authentication** — http/oauth2 · 2 schemes
- **Sms Assist Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Facilities Management, Property Maintenance, Work Orders, Field Service, Maintenance, Real-Estate, GraphQL, Webhook, Vendor Network

---

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