Captions

Captions is an AI video editor and generator built by Mirage, an AI research company headquartered in New York City. The consumer and enterprise apps automate the most time-consuming parts of video production — cutting scenes, adding B-roll, inserting music and sound effects, generating and styling captions, dubbing into 30+ languages, correcting eye contact, and generating entirely new videos from a text prompt or a selfie via AI Avatars, AI Actors, and AI Twins. The Mirage Video API (api.mirage.app) exposes this pipeline to developers: asynchronous AI video generation, adding stylized captions to videos, caption-template discovery, text-to-speech audio, and meta text overlays. Authentication is a simple x-api-key header, keys are minted in the Mirage platform dashboard, and long-running jobs are polled for status.

Captions publishes 7 APIs on the APIs.io network, including Audio API, health API, internal API, and 4 more. Tagged areas include Company, Video, Artificial Intelligence, Video Editing, and Video Generation.

The Captions catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Captions’ developer surface includes developer portal, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 28 more developer resources.

🌐 Visit website 📡 Source on GitHub

70.8/100 exemplar ▬ flat Agent 42/100 agent ready Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0

AccessFreemiumSelf serve⚡ Free to try

7 APIs 1 MCP Servers

CompanyVideoArtificial IntelligenceVideo EditingVideo GenerationCaptionsSubtitlesText to SpeechAI AvatarsContent CreationMedia

Kin Score

Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0

Composite quality — 70.8/100 · exemplar

Contract Quality 13.4 / 25

Developer Ergonomics 11.2 / 20

Commercial Clarity 18.4 / 20

Operational Transparency 8.9 / 13

Governance 10.8 / 12

Discoverability 8.2 / 10

Agent readiness — 42/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/captions: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 7

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

Open Collections 10

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Rate Limits 1

Documented rate limits and quota policies.

Captions Rate Limits

6 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Examples 3

Example request and response payloads for these APIs.

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

AgentSkill

AgenticAccess

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Vocabulary

JSONLDContext

Scroll for all 7

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

Compliance

Compliance

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

FinOps

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: captions
name: Captions
description: 'Captions is an AI video editor and generator built by Mirage, an AI research company headquartered in New York
  City. The consumer and enterprise apps automate the most time-consuming parts of video production — cutting scenes, adding
  B-roll, inserting music and sound effects, generating and styling captions, dubbing into 30+ languages, correcting eye contact,
  and generating entirely new videos from a text prompt or a selfie via AI Avatars, AI Actors, and AI Twins. The Mirage Video
  API (api.mirage.app) exposes this pipeline to developers: asynchronous AI video generation, adding stylized captions to
  videos, caption-template discovery, text-to-speech audio, and meta text overlays. Authentication is a simple x-api-key header,
  keys are minted in the Mirage platform dashboard, and long-running jobs are polled for status.'
url: https://raw.githubusercontent.com/api-evangelist/captions/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: active
x-tier-reason: enriched-real-api
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-08-08'
image: https://captions.ai/logo256.png
tags:
- Company
- Video
- Artificial Intelligence
- Video Editing
- Video Generation
- Captions
- Subtitles
- Text to Speech
- AI Avatars
- Content Creation
- Media
apis:
- aid: captions:captions-audio-api
  name: Captions Audio API
  description: The Audio API from Captions — 1 operation(s) for audio.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Audio
  properties:
  - type: OpenAPI
    url: openapi/captions-audio-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-health-api
  name: Captions health API
  description: The health API from Captions — 1 operation(s) for health.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - health
  properties:
  - type: OpenAPI
    url: openapi/captions-health-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-internal-api
  name: Captions internal API
  description: The internal API from Captions — 8 operation(s) for internal.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - internal
  properties:
  - type: OpenAPI
    url: openapi/captions-internal-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-meta-text-overlays-api
  name: Captions Meta Text Overlays API
  description: The Meta Text Overlays API from Captions — 2 operation(s) for meta text overlays.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Meta Text Overlays
  properties:
  - type: OpenAPI
    url: openapi/captions-meta-text-overlays-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-root-api
  name: Captions root API
  description: The root API from Captions — 1 operation(s) for root.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - root
  properties:
  - type: OpenAPI
    url: openapi/captions-root-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-video-captions-api
  name: Captions Video Captions API
  description: The Video Captions API from Captions — 3 operation(s) for video captions.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Video Captions
  properties:
  - type: OpenAPI
    url: openapi/captions-video-captions-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
- aid: captions:captions-videos-api
  name: Captions Videos API
  description: The Videos API from Captions — 3 operation(s) for videos.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Videos
  properties:
  - type: OpenAPI
    url: openapi/captions-videos-api-openapi.yml
  - type: Documentation
    url: https://captions.ai/help/docs/api/overview
  - type: APIReference
    url: https://captions.ai/help/api-reference
  - type: Authentication
    url: authentication/captions-authentication.yml
common:
- type: Overlay
  url: overlays/captions-mirage-overlay.yaml
- type: Portal
  url: https://platform.mirage.app/
- type: Documentation
  url: https://captions.ai/help/docs/api/overview
- type: APIReference
  url: https://captions.ai/help/api-reference
- type: GettingStarted
  url: https://captions.ai/help
- type: Support
  url: https://captions.ai/help
- type: Blog
  url: https://captions.ai/blog
- type: Pricing
  url: https://captions.ai/pricing
- type: SignUp
  url: https://captions.ai/signup
- type: TermsOfService
  url: https://mirage.app/legal/captions-terms
- type: PrivacyPolicy
  url: https://mirage.app/legal/privacy-policy
- type: GitHubOrganization
  url: https://github.com/captions-ai
- type: Website
  url: https://captions.ai
- type: StatusPage
  url: https://mirage.statuspage.io
- type: Compliance
  url: https://captions.ai/solutions/enterprise
- type: OpenAPI
  url: openapi/_original/captions-mirage-openapi-original.json
- type: LLMsTxt
  url: llms/captions-llms.txt
- type: Authentication
  url: authentication/captions-authentication.yml
- type: Conventions
  url: conventions/captions-conventions.yml
- type: ErrorCatalog
  url: errors/captions-problem-types.yml
- type: Lifecycle
  url: lifecycle/captions-lifecycle.yml
- type: DataModel
  url: data-model/captions-data-model.yml
- type: Conformance
  url: conformance/captions-conformance.yml
- type: DomainSecurity
  url: security/captions-domain-security.yml
- type: MCPServer
  url: mcp/captions-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: AgenticAccess
  url: agentic-access/captions-agentic-access.yml
- type: Plans
  url: plans/captions-plans.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/captionsapp
- type: X
  url: https://x.com/getcaptionsapp
- type: ChangeLog
  url: https://captions.ai/help/whats-new
- type: RateLimits
  url: rate-limits/captions-rate-limits.yml
- type: FinOps
  url: finops/captions-finops.yml
- type: Vocabulary
  url: vocabulary/captions-vocabulary.yml
- type: JSONLDContext
  url: json-ld/captions-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence
x-merged-from:
- captions-ai