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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Hourone the way a machine reads it — 16 machine-readable artifacts across 2 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Hourone scores 36.5/100 (thin), with a separate agent-readiness read of 28/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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title="Hourone on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/hourone.svg"
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</a>[](https://providers.apievangelist.com/providers/hourone/)<!-- Kin Score · API Evangelist -->
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title="Hourone on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/hourone/card.svg"
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Hourone
Each block below is one kind of artifact we hold for Hourone. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 6
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONsizzle-server general API
OPEN COLLECTIONsizzle-server general keys API
OPEN COLLECTIONsizzle-server general playground API
OPEN COLLECTIONsizzle-server general videos API
OPEN COLLECTIONsizzle-server general webhook API
OPEN COLLECTIONEvent Specifications 2
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
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...
ASYNCAPIHourone Webhooks
ASYNCAPISecurity Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Hourone — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 4
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 1
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/hourone · machine-readable index on apis.io
This is an independent, third-party profile of Hourone, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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