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 API contracts indexed 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 and 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

35.4/100 thin ▬ flat Agent 29/100 agent ready saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract 4 Agent Skills

Company Artificial Intelligence Video Video Generation Generative AI AI Avatars Text-to-Speech Media Content Creation Webhook

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

keyswebhook

POST /keys DELETE /keys/{key_id} POST /webhooks PUT /webhooks/{webhook_id}

Content Origination & Production Management

BC-3700

videos

POST /videos POST /videos/{video_id}/subtitles

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 35.4/100 · thin

Contract Quality 10.7 / 19

Developer Ergonomics 8.1 / 15

Access Clarity 1.0 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 29/100 · agent ready

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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 6.6 — up to +18.7 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points
Contract Quality scores 57.2 — up to +10.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/hourone/apis.yml: open an issue on github.com/api-evangelist/hourone to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 5

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

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

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

Create a video from a Blueprint and wait for it

AGENT SKILL

Preview a voice, then build a dynamic video

AGENT SKILL

Preview a voice then generate a dynamic video with subtitles

AGENT SKILL

Subscribe to video webhooks and verify signatures

AGENT SKILL

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

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Hourone API Rules

50 rules · 41 errors 6 warnings 3 info

SPECTRAL

OpenAPI Overlays 2

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Hourone Openapi Overlay

3 actions · update · hour-one-openapi.json

DERIVED

Hourone Overlay

3 actions · documentation · hourone-openapi-original.json

DERIVED

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

APIReference

OpenAPI

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

Conventions

ErrorCatalog

Lifecycle

Conformance

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)

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: '2026-11-02'
  method: derived
image: https://hourone.ai/
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-08-08'
x-docs-platform: gitbook
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
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:
  - Video
  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

Hourone API — frequently asked questions

Does Hourone have an API?

Yes. APIs.io lists 6 APIs from Hourone, including Hourone General API, Hourone Keys API and Hourone Playground API, and 3 more.

Is there an OpenAPI specification for the Hourone API?

Yes. APIs.io indexes 6 OpenAPI specifications for Hourone, each linked for download from this page.

How do I authenticate with the Hourone API?

Hourone uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Hourone Authentication.

Is the Hourone API ready for AI agents?

Hourone has a Kin Score of 35.4 out of 100 (thin) and an Agent Readiness score of 28.7 (agent-ready), scored by API Evangelist on 2026-11-02.

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