Captions website screenshot

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 12 API contracts indexed on the APIs.io network, including Audio API, Health API, Internal API, and 9 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 29 more developer resources.

🌐 Visit website📡 Profile data on GitHub
54.6/100 strong ▬ flat Agent 35/100 agent ready Front door AI 6/6 dominant Heartbeat 45/100 slowing saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →
AccessFreemiumSelf serve⚡ Free to try
2 published contracts 3 Agent Skills
CompanyVideoArtificial IntelligenceVideo EditingVideo GenerationCaptionsSubtitlesText-to-SpeechAI AvatarsContent CreationMedia

What this lets a business do 2

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

AI Model Services
AE-110
AI AdsAI CreatorAudioVideosVideos v2internal-fal
POST /ads/submit POST /creator/submit POST /v1/audio/text-to-speech/{voice_id} POST /v1/videos
Content Origination & Production Management
BC-3700
Video Captions
POST /v1/videos/captions GET /v1/videos/captions/templates

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0
Composite quality — 54.6/100 · strong
Contract Quality 9.2 / 19
Developer Ergonomics 8.8 / 15
Access Clarity 9.1 / 15
Operational Transparency 4.1 / 10
Contract Governance 3.8 / 9
Discoverability 5.5 / 8
Regulatory Posture 4.1 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 35/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 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
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 5 / 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/.
Show this score on your site. Kin Score badge preview for Captions It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/captions/"><img src="https://apis.io/badge/captions/card.svg" alt="Captions on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
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
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • 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
  • Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
  • Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
5 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/captions/apis.yml: open an issue on github.com/api-evangelist/captions 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 12

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

Captions Audio API

The Audio API from Captions — 1 operation(s) for audio.

Captions Health API

The health API from Captions — 1 operation(s) for health.

Captions Internal API

The internal API from Captions — 8 operation(s) for internal.

Captions Meta Text Overlays API

The Meta Text Overlays API from Captions — 2 operation(s) for meta text overlays.

Captions Root API

The root API from Captions — 1 operation(s) for root.

Captions Video Captions API

The Video Captions API from Captions — 3 operation(s) for video captions.

Captions Videos API

The Videos API from Captions — 3 operation(s) for videos.

Captions AI Ads API

Generate UGC-style AI advertising videos using AI creators

Captions AI Creator API

Generate talking-head videos using community AI avatars or AI Twins

Captions Catalog API

The Catalog API from Captions — 2 operation(s) for catalog.

Captions Internal Fal API

The internal-fal API from Captions — 5 operation(s) for internal-fal.

Captions Videos v2 API

The Videos v2 API from Captions — 2 operation(s) for videos v2.

Scroll for all 12

Open Collections 9

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

Captions AI Creator & AI Ads API

OPEN COLLECTION

Captions & AI Ads AI Creator API

OPEN COLLECTION

Mirage Video Audio API

OPEN COLLECTION

Mirage Video Audio health API

OPEN COLLECTION

Mirage Video Audio internal API

OPEN COLLECTION

Mirage Video Audio Meta Text Overlays API

OPEN COLLECTION

Mirage Video Audio root API

OPEN COLLECTION

Mirage Video Audio Video Captions API

OPEN COLLECTION

Mirage Video Audio Videos API

OPEN COLLECTION

Scroll for all 9

Agent Skills 3

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

Add stylized captions to a video

AGENT SKILL

Generate an AI avatar video and retrieve the result

AGENT SKILL

Synthesize speech audio from text

AGENT SKILL

Pricing Plans 2

Published pricing tiers and plan structures.

Captions Plans Pricing

6 plans

PLANS

Captions Plans

5 plans

PLANS

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.

Captions Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Captions Context

3 classes · 31 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Captions — jsonschema rules

5 rules · 4 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

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.

Captions Mirage Overlay

4 actions · update · captions-mirage-openapi-original.json

DERIVED

JSON Schema 3

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

MACaptionTemplate

5 properties

JSON SCHEMA

CreatorJobPollResponse

4 properties

JSON SCHEMA

MAVideo

12 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Captions Add Captions Example

5 fields

EXAMPLE

Captions Creator Submit Example

6 fields

EXAMPLE

Captions Generate Video Example

6 fields

EXAMPLE

Security Posture 2

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

Captions Authentication

apiKey · 1 scheme

SECURITY

Captions Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Captions Agentic Access

23 operations · 11 acting · 5 human-in-the-loop

23 operations · 11 acting

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
LLMsTxt
 X-MCPServerCandidate
X-MCPServerCandidate
 AgentSkill
AgentSkill
 AgenticAccess
AgenticAccess

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 DataModel
DataModel
 Conformance
Conformance
 Vocabulary
Vocabulary
 JSONLDContext
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
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog
 RateLimits
RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Blog
Blog
 Website
Website
 LinkedIn
LinkedIn

Other 3

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 Overlay
Overlay
 X
X

Source (apis.yml)

apis.yml Raw ↑ 
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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.23'
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
tags_raw:
- 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
  tags_raw:
  - 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
  tags_raw:
  - 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
  tags_raw:
  - 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:
  - Video
  tags_raw:
  - 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
- aid: captions:captions-ai-ads-api
  name: Captions AI Ads API
  description: Generate UGC-style AI advertising videos using AI creators
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - AI Ads
  properties:
  - type: OpenAPI
    url: openapi/captions-ai-ads-api-openapi.yml
- aid: captions:captions-ai-creator-api
  name: Captions AI Creator API
  description: Generate talking-head videos using community AI avatars or AI Twins
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - AI Creator
  properties:
  - type: OpenAPI
    url: openapi/captions-ai-creator-api-openapi.yml
- aid: captions:captions-catalog-api
  name: Captions Catalog API
  description: The Catalog API from Captions — 2 operation(s) for catalog.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Catalog
  properties:
  - type: OpenAPI
    url: openapi/captions-catalog-api-openapi.yml
- aid: captions:captions-internal-fal-api
  name: Captions Internal Fal API
  description: The internal-fal API from Captions — 5 operation(s) for internal-fal.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - internal-fal
  properties:
  - type: OpenAPI
    url: openapi/captions-internal-fal-api-openapi.yml
- aid: captions:captions-videos-v2-api
  name: Captions Videos v2 API
  description: The Videos v2 API from Captions — 2 operation(s) for videos v2.
  humanURL: https://captions.ai/help/api-reference
  baseURL: https://api.mirage.app
  tags:
  - Videos v2
  properties:
  - type: OpenAPI
    url: openapi/captions-videos-v2-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/captions-capability-edges.yml
  name: Captions Business Capability Map
- 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: X-MCPServerCandidate
  url: mcp/captions-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: 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

Captions API — frequently asked questions

Does Captions have an API?

Yes. APIs.io lists 12 APIs from Captions, including Captions Audio API, Captions Health API and Captions Internal API, and 9 more.

Is there an OpenAPI specification for the Captions API?

Yes. APIs.io indexes 12 OpenAPI specifications for Captions, each linked for download from this page.

How do I authenticate with the Captions API?

Captions uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Captions Authentication.

How much does the Captions API cost?

APIs.io lists 11 pricing plans for Captions, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Captions API ready for AI agents?

Captions has a Kin Score of 54.6 out of 100 (strong) and an Agent Readiness score of 34.7 (agent-ready), scored by API Evangelist on 2026-11-02.

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