aid: hotel-engine
name: Engine
description: >-
  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.
image: https://engine.com/_astro/engine-og-default.BAjJjAAC.png
url: https://raw.githubusercontent.com/api-evangelist/hotel-engine/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-source-url: https://forgeglobal.com/hotel-engine_stock/
x-tier: profiled
x-tier-reason: enrichment
specificationVersion: '0.20'
created: '2026-08-04'
modified: '2026-08-04'
tags:
- Company
- Travel
- Business Travel
- Lodging
- Hotels
- Booking
- Travel Management
- Expense Management
- Payments
- gRPC
- Protobuf
- Partner API
apis:
- aid: hotel-engine:hotel-engine-catalogservice-api
  name: Engine Catalog Service API
  description: The CatalogService API from Engine — 1 operation(s) for catalogservice.
  humanURL: https://engine-public.github.io/engine-partner-api/
  baseURL: https://partner-api.engine.com
  tags:
  - CatalogService
  properties:
  - type: OpenAPI
    url: openapi/hotel-engine-catalogservice-api-openapi.yml
  - type: Protobuf
    url: grpc/_index.yml
  - type: Authentication
    url: authentication/hotel-engine-authentication.yml
  - type: Conventions
    url: conventions/hotel-engine-conventions.yml
  - type: ErrorCatalog
    url: errors/hotel-engine-problem-types.yml
  - type: DataModel
    url: data-model/hotel-engine-data-model.yml
  - type: RateLimits
    url: rate-limits/hotel-engine-rate-limits.yml
  - type: MCPServer
    url: mcp/hotel-engine-mcp.yml
  - type: Documentation
    url: https://engine-public.github.io/engine-partner-api/
  - type: APIReference
    url: https://engine-public.github.io/engine-partner-api/swagger-ui/index.html
  - type: GettingStarted
    url: https://engine-public.github.io/engine-partner-api/getting-started.html
- aid: hotel-engine:hotel-engine-contentservice-api
  name: Engine Content Service API
  description: The ContentService API from Engine — 2 operation(s) for contentservice.
  humanURL: https://engine-public.github.io/engine-partner-api/
  baseURL: https://partner-api.engine.com
  tags:
  - ContentService
  properties:
  - type: OpenAPI
    url: openapi/hotel-engine-contentservice-api-openapi.yml
  - type: Protobuf
    url: grpc/_index.yml
  - type: Authentication
    url: authentication/hotel-engine-authentication.yml
  - type: Conventions
    url: conventions/hotel-engine-conventions.yml
  - type: ErrorCatalog
    url: errors/hotel-engine-problem-types.yml
  - type: DataModel
    url: data-model/hotel-engine-data-model.yml
  - type: RateLimits
    url: rate-limits/hotel-engine-rate-limits.yml
  - type: Documentation
    url: https://engine-public.github.io/engine-partner-api/
  - type: APIReference
    url: https://engine-public.github.io/engine-partner-api/swagger-ui/index.html
  - type: GettingStarted
    url: https://engine-public.github.io/engine-partner-api/getting-started.html
- aid: hotel-engine:hotel-engine-lodgingbookingservice-api
  name: Engine Lodging Booking Service API
  description: The LodgingBookingService API from Engine — 5 operation(s) for lodgingbookingservice.
  humanURL: https://engine-public.github.io/engine-partner-api/
  baseURL: https://partner-api.engine.com
  tags:
  - LodgingBookingService
  properties:
  - type: OpenAPI
    url: openapi/hotel-engine-lodgingbookingservice-api-openapi.yml
  - type: Protobuf
    url: grpc/_index.yml
  - type: Authentication
    url: authentication/hotel-engine-authentication.yml
  - type: Conventions
    url: conventions/hotel-engine-conventions.yml
  - type: ErrorCatalog
    url: errors/hotel-engine-problem-types.yml
  - type: DataModel
    url: data-model/hotel-engine-data-model.yml
  - type: RateLimits
    url: rate-limits/hotel-engine-rate-limits.yml
  - type: Documentation
    url: https://engine-public.github.io/engine-partner-api/
  - type: APIReference
    url: https://engine-public.github.io/engine-partner-api/swagger-ui/index.html
  - type: GettingStarted
    url: https://engine-public.github.io/engine-partner-api/getting-started.html
- aid: hotel-engine:hotel-engine-lodgingshoppingservice-api
  name: Engine Lodging Shopping Service API
  description: The LodgingShoppingService API from Engine — 2 operation(s) for lodgingshoppingservice.
  humanURL: https://engine-public.github.io/engine-partner-api/
  baseURL: https://partner-api.engine.com
  tags:
  - LodgingShoppingService
  properties:
  - type: OpenAPI
    url: openapi/hotel-engine-lodgingshoppingservice-api-openapi.yml
  - type: Protobuf
    url: grpc/_index.yml
  - type: Authentication
    url: authentication/hotel-engine-authentication.yml
  - type: Conventions
    url: conventions/hotel-engine-conventions.yml
  - type: ErrorCatalog
    url: errors/hotel-engine-problem-types.yml
  - type: DataModel
    url: data-model/hotel-engine-data-model.yml
  - type: RateLimits
    url: rate-limits/hotel-engine-rate-limits.yml
  - type: Documentation
    url: https://engine-public.github.io/engine-partner-api/
  - type: APIReference
    url: https://engine-public.github.io/engine-partner-api/swagger-ui/index.html
  - type: GettingStarted
    url: https://engine-public.github.io/engine-partner-api/getting-started.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/hotel-engine-omni-partner-api-overlay.yaml
- type: License
  name: Apache-2.0
  url: https://github.com/engine-public/engine-partner-api/blob/main/LICENSE
- type: Website
  url: https://www.engine.com/
- type: DeveloperPortal
  url: https://omni.engine.com/
- type: Documentation
  url: https://engine-public.github.io/engine-partner-api/
- type: APIReference
  name: HTTP/JSON reference (Swagger UI)
  url: https://engine-public.github.io/engine-partner-api/swagger-ui/index.html
- type: APIReference
  name: gRPC reference
  url: https://engine-public.github.io/engine-partner-api/api/grpc/index.html
- type: GettingStarted
  url: https://engine-public.github.io/engine-partner-api/getting-started.html
- type: Support
  url: https://engine-public.github.io/engine-partner-api/support.html
- type: HelpCenter
  url: https://www.engine.com/faqs
- type: Blog
  url: https://www.engine.com/blog
- type: GitHubOrganization
  url: https://github.com/engine-public
- type: SourceCode
  url: https://github.com/engine-public/engine-partner-api
- type: Pricing
  url: https://www.engine.com/pricing
- type: SignUp
  url: https://www.engine.com/sign-up
- type: TermsOfService
  url: https://www.engine.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.engine.com/privacy-policy
- type: ChangeLog
  url: https://github.com/engine-public/engine-partner-api/releases
- type: ChangeLog
  name: Structured changelog
  url: changelog/hotel-engine-changelog.yml
- type: Deprecation
  url: https://engine-public.github.io/engine-partner-api/versioning.html#support-for-deprecated-versions
- type: Lifecycle
  url: lifecycle/hotel-engine-lifecycle.yml
- type: Security
  url: https://www.engine.com/responsible-disclosure
- type: VulnerabilityDisclosure
  url: security/hotel-engine-vulnerability-disclosure.yml
- type: TrustCenter
  url: https://trust.engine.com/
- type: Compliance
  url: security/hotel-engine-trust-center.yml
- type: Conformance
  url: conformance/hotel-engine-conformance.yml
- type: Packages
  url: packages/hotel-engine-packages.yml
- type: SDKs
  url: packages/hotel-engine-packages.yml
- type: Sandbox
  url: sandbox/hotel-engine-sandbox.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/hotel-engine-llms.txt
- type: AgenticAccess
  url: agentic-access/hotel-engine-agentic-access.yml
- type: DomainSecurity
  url: security/hotel-engine-domain-security.yml
x-enrichment:
  date: '2026-08-04'
  status: enriched
  artifacts_added: 74
  pass: local-v1