Hourone website screenshot

Hourone

Hour One (developer surface "MakeReals") is an AI video-generation platform that turns text, scripts and data into studio-quality videos fronted by lifelike AI presenters (characters) and text-to-speech voices. Its REST API lets developers create videos programmatically two ways — from a Blueprint (an existing HourOne studio project/template) or Dynamically (scenes built from scratch with media, text, palette, character and voice) — preview voices, generate multi-language subtitles, pull usage analytics, manage API keys, and subscribe to video.ready / video.failed webhooks. The API is asynchronous (create, then poll by id or receive a signed webhook) and authenticates with a single api-key header. Common uses include personalized video at scale, L&D and training content, CRM/LMS automation, and localized marketing video. Hour One is a portfolio company of Kindred Ventures.

Hourone publishes 6 APIs on the APIs.io network, including general API, keys API, playground API, and 3 more. Tagged areas include Company, Artificial Intelligence, Video, Video Generation, and Generative AI.

The Hourone catalog on APIs.io includes 2 event-driven AsyncAPI specifications.

Hourone’s developer surface includes documentation, API reference, getting-started guide, support, signup flow, authentication, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.5/100 thin ▬ flat Agent 28/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
2 APIs
CompanyArtificial IntelligenceVideoVideo GenerationGenerative AIAI AvatarsText-to-SpeechMediaContent CreationWebhook

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 36.5/100 · thin
Contract Quality 14.0 / 23
Developer Ergonomics 9.8 / 18
Access Clarity 1.2 / 18
Operational Transparency 1.2 / 12
Contract Governance 0.5 / 11
Discoverability 6.8 / 9
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/hourone: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

Hourone general API

The general API from Hourone — 3 operation(s) for general.

Hourone keys API

The keys API from Hourone — 2 operation(s) for keys.

Hourone playground API

The playground API from Hourone — 4 operation(s) for playground.

Hourone videos API

The videos API from Hourone — 4 operation(s) for videos.

Hourone voice-preview API

The voice-preview API from Hourone — 2 operation(s) for voice-preview.

Hourone webhook API

The webhook API from Hourone — 5 operation(s) for webhook.

Open Collections 6

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

sizzle-server general API

OPEN COLLECTION

sizzle-server general keys API

OPEN COLLECTION

sizzle-server general playground API

OPEN COLLECTION

sizzle-server general videos API

OPEN COLLECTION

sizzle-server general webhook API

OPEN COLLECTION

Event Specifications 2

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Hour One (MakeReals) Webhooks

Outbound webhook notifications for video processing lifecycle. Hour One POSTs a signed JSON payload to your registered endpoint when a video finishes rendering or fails. Each re...

ASYNCAPI

Hourone Webhooks

ASYNCAPI

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Hourone Authentication

apiKey/http · 2 schemes

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Hourone Agentic Access

26 operations · 15 acting · 1 human-in-the-loop

26 operations · 15 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 4

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 OpenAPI
OpenAPI
 AsyncAPI
AsyncAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 X-MCPServerCandidate
X-MCPServerCandidate
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks
Webhooks
 Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conformance
Conformance
 DataModel
DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Support
Support

Company 1

The organization behind the API

Website
Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: hourone
name: Hourone
description: Hour One (developer surface "MakeReals") is an AI video-generation platform that turns text, scripts and data
  into studio-quality videos fronted by lifelike AI presenters (characters) and text-to-speech voices. Its REST API lets developers
  create videos programmatically two ways — from a Blueprint (an existing HourOne studio project/template) or Dynamically
  (scenes built from scratch with media, text, palette, character and voice) — preview voices, generate multi-language subtitles,
  pull usage analytics, manage API keys, and subscribe to video.ready / video.failed webhooks. The API is asynchronous (create,
  then poll by id or receive a signed webhook) and authenticates with a single api-key header. Common uses include personalized
  video at scale, L&D and training content, CRM/LMS automation, and localized marketing video. Hour One is a portfolio company
  of Kindred Ventures.
url: https://raw.githubusercontent.com/api-evangelist/hourone/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- kindred-ventures
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-09-03'
  method: derived
image: https://hourone.ai/
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-08'
tags:
- Company
- Artificial Intelligence
- Video
- Video Generation
- Generative AI
- AI Avatars
- Text-to-Speech
- Media
- Content Creation
- Webhook
tags_raw:
- Company
- Artificial Intelligence
- Video
- Video Generation
- Generative AI
- AI Avatars
- Text to Speech
- Media
- Content Creation
- Webhooks
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: hourone:hourone-general-api
  name: Hourone general API
  description: The general API from Hourone — 3 operation(s) for general.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags: []
  tags_raw:
  - general
  properties:
  - type: OpenAPI
    url: openapi/hourone-general-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
- aid: hourone:hourone-keys-api
  name: Hourone keys API
  description: The keys API from Hourone — 2 operation(s) for keys.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags:
  - Keys
  tags_raw:
  - keys
  properties:
  - type: OpenAPI
    url: openapi/hourone-keys-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
- aid: hourone:hourone-playground-api
  name: Hourone playground API
  description: The playground API from Hourone — 4 operation(s) for playground.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags:
  - Playground
  tags_raw:
  - playground
  properties:
  - type: OpenAPI
    url: openapi/hourone-playground-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
- aid: hourone:hourone-videos-api
  name: Hourone videos API
  description: The videos API from Hourone — 4 operation(s) for videos.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags:
  - Videos
  tags_raw:
  - videos
  properties:
  - type: OpenAPI
    url: openapi/hourone-videos-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
- aid: hourone:hourone-voice-preview-api
  name: Hourone voice-preview API
  description: The voice-preview API from Hourone — 2 operation(s) for voice-preview.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags:
  - voice-preview
  properties:
  - type: OpenAPI
    url: openapi/hourone-voice-preview-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
- aid: hourone:hourone-webhook-api
  name: Hourone webhook API
  description: The webhook API from Hourone — 5 operation(s) for webhook.
  humanURL: https://hourone.gitbook.io/api-docs
  baseURL: https://api.makereals.com/api/v1
  tags:
  - Webhook
  tags_raw:
  - webhook
  properties:
  - type: OpenAPI
    url: openapi/hourone-webhook-api-openapi.yml
  - type: Documentation
    url: https://hourone.gitbook.io/api-docs
  - type: APIReference
    url: https://hourone.gitbook.io/api-docs/reference/api-reference
  - type: GettingStarted
    url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
  - type: Authentication
    url: authentication/hourone-authentication.yml
  - type: Webhooks
    url: asyncapi/hourone-webhooks.yml
common:
- type: CapabilityMap
  url: capabilities/hourone-capability-edges.yml
  name: Hourone Business Capability Map
- type: Website
  url: https://hourone.ai/
- type: DeveloperPortal
  url: https://hourone.gitbook.io/api-docs
- type: Documentation
  url: https://hourone.gitbook.io/api-docs
- type: APIReference
  url: https://hourone.gitbook.io/api-docs/reference/api-reference
- type: GettingStarted
  url: https://hourone.gitbook.io/api-docs/blueprint-quick-start
- type: Support
  url: https://help.hourone.ai/hc/en-us/categories/8918170914449-Hour-One
- type: GitHubOrganization
  url: https://github.com/hourone-ai
- type: SignUp
  url: https://app.hourone.ai
- type: OpenAPI
  url: openapi/_original/hourone-openapi-original.json
- type: Authentication
  url: authentication/hourone-authentication.yml
- type: AgenticAccess
  url: agentic-access/hourone-agentic-access.yml
- type: Webhooks
  url: asyncapi/hourone-webhooks.yml
- type: Conventions
  url: conventions/hourone-conventions.yml
- type: ErrorCatalog
  url: errors/hourone-problem-types.yml
- type: Lifecycle
  url: lifecycle/hourone-lifecycle.yml
- type: Conformance
  url: conformance/hourone-conformance.yml
- type: DataModel
  url: data-model/hourone-data-model.yml
- type: X-MCPServerCandidate
  url: mcp/hourone-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/hourone-llms.txt
- type: Overlay
  url: overlays/hourone-overlay.yaml
- type: AgentSkill
  url: skills/_index.yml
- type: AsyncAPI
  url: asyncapi/hourone-webhooks-asyncapi.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence
x-merged-from:
- hour-one

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