# Engine

**Canonical:** https://apis.io/providers/hotel-engine/  
**Website:** https://www.engine.com/  
**APIs profiled:** 4

Engine (formerly Hotel Engine, rebranded in 2024) is a Denver, Colorado business travel and spend platform for booking and managing lodging, flights, rental cars, group travel, and meeting and event spaces, with travel policy enforcement, trip approvals, consolidated DirectBill invoicing, and the Engine X charge card. Engine says it serves 25,000+ businesses and 1.2 million travelers with negotiated rates across 1,000,000+ hotel properties. Its API product is Omni — a partner-facing lodging inventory API offered over gRPC and HTTP/JSON, authenticated with mutual TLS, that covers property content, real-time rate shopping, booking, folio generation, and cancellation. Omni is protobuf-first: the proto contracts are published under Apache 2.0 on GitHub and the Swagger document, descriptor set, and JVM client bindings are generated from them and released per version.

## Kin Score — 53.3 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 53.3).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 49.3 |
| Governance | 11.5 |
| Operational Transparency | 71.1 |
| Developer Ergonomics | 56.0 |
| Commercial Clarity | 60.5 |

Regulatory layer — **Payments**: 46.9 (matched via tags).

## Agent readiness — 25.9 (agent-aware)

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

## APIs (4)

- **Engine Catalog Service API** — The CatalogService API from Engine — 1 operation(s) for catalogservice.
- **Engine Content Service API** — The ContentService API from Engine — 2 operation(s) for contentservice.
- **Engine Lodging Booking Service API** — The LodgingBookingService API from Engine — 5 operation(s) for lodgingbookingservice.
- **Engine Lodging Shopping Service API** — The LodgingShoppingService API from Engine — 2 operation(s) for lodgingshoppingservice.

## MCP servers (1)

- **hotel-engine-mcp.yml**

## Agentic access (1)

- **Hotel Engine Agentic Access** — 11 operations · 10 acting

## Security (4)

- **Hotel Engine Authentication** — mutualTLS · 1 scheme
- **Hotel Engine Domain Security** — TLSv1.3 · DNSSEC · DMARC
- **Hotel Engine Vulnerability Disclosure** — Hackerone · contact published
- **Hotel Engine Trust Center** — SOC 2 Type II

## Tags

Company, Travel, Business Travel, Lodging, Hotels, Booking, Travel Management, Expense Management, Payments, gRPC, Protobuf, Partner API

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