MediaCaption API

A credit-billed REST API for retrieving public YouTube transcripts, with single and bulk transcript jobs, job-level webhooks, and AI transcription/translation capabilities. Backed by a public OpenAPI 3.1 contract with bearer/X-API-Key authentication.

MediaCaption API publishes 1 API on the APIs.io network: Media Caption Public API. Tagged areas include YouTube, Transcription, Captions, Subtitles, and Video.

The MediaCaption API catalog on APIs.io includes 1 event-driven AsyncAPI specification.

MediaCaption API’s developer surface includes authentication, changelog, pricing, support, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

48.0/100 developing ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs 1 MCP Servers

YouTube Transcription Captions Subtitles Video REST OpenAPI Webhook Speech-to-Text Media Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 48.0/100 · developing

Contract Quality 10.8 / 23

Developer Ergonomics 8.5 / 18

Access Clarity 9.5 / 18

Operational Transparency 6.5 / 12

Contract Governance 0.5 / 11

Discoverability 5.7 / 9

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 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 7 / 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/mediacaption-api: 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 1

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

Media Caption Public API

REST API for fetching public YouTube transcripts synchronously and in bulk, with account/balance endpoints, job polling, and completion webhooks. Bearer API key or X-API-Key auth.

MCP Servers 1

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

MediaCaption API MCP Server

Media Caption ships no MCP server — no hosted endpoint, no stdio package, no MCP mention anywhere in the docs, and a web search finds only unaffiliated third-party YouTube-capti...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Mediacaption Api Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mediacaption Api Rate Limits

4 limits

RATE LIMITS

Event Specifications 1

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

Mediacaption Api Webhooks

ASYNCAPI

Security Posture 2

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

Mediacaption Api Authentication

apiKey/http · 2 schemes

SECURITY

Mediacaption Api Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown

MCPServer

LLMsTxt

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 4

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

RateLimits

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

name: MediaCaption API
description: A credit-billed REST API for retrieving public YouTube transcripts, with single and bulk transcript jobs, job-level
  webhooks, and AI transcription/translation capabilities. Backed by a public OpenAPI 3.1 contract with bearer/X-API-Key authentication.
url: https://raw.githubusercontent.com/api-evangelist/mediacaption-api/refs/heads/main/apis.yml
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
created: '2026-07-18'
modified: '2026-09-03'
image: https://www.mediacaption.io/android-chrome-512x512.png
specificationVersion: '0.23'
tags:
- YouTube
- Transcription
- Captions
- Subtitles
- Video
- REST
- OpenAPI
- Webhook
- Speech-to-Text
- Media
- Developer Tools
tags_raw:
- youtube
- transcription
- captions
- subtitles
- video
- rest
- openapi
- webhooks
- speech-to-text
- media
- developer-tools
apis:
- name: Media Caption Public API
  description: REST API for fetching public YouTube transcripts synchronously and in bulk, with account/balance endpoints,
    job polling, and completion webhooks. Bearer API key or X-API-Key auth.
  humanURL: https://www.mediacaption.io/api
  baseURL: https://api.mediacaption.io/v1
  image: https://www.mediacaption.io/android-chrome-512x512.png
  tags:
  - YouTube
  - Transcription
  - Captions
  - Subtitles
  - Video
  - REST
  - OpenAPI
  - Webhook
  - Speech-to-Text
  - Media
  - Developer Tools
  tags_raw:
  - youtube
  - transcription
  - captions
  - subtitles
  - video
  - rest
  - openapi
  - webhooks
  - speech-to-text
  - media
  - developer-tools
  properties:
  - type: OpenAPI
    url: https://www.mediacaption.io/docs/openapi/mediacaption.v1.yaml
  - type: Documentation
    url: https://www.mediacaption.io/docs
  - type: GettingStarted
    url: https://www.mediacaption.io/docs/quickstart
  - type: OpenAPI
    url: openapi/mediacaption-api-openapi.yaml
  - type: Overlay
    url: overlays/mediacaption-api-openapi-overlay.yaml
  - type: APIReference
    url: https://www.mediacaption.io/docs/api-reference/transcripts
maintainers:
- FN: MediaCaption API
  url: https://www.mediacaption.io
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 95
  at: '2026-07-18T18:19:45.114Z'
common:
- type: Website
  url: https://mediacaption.io
- type: DomainSecurity
  url: security/mediacaption-api-domain-security.yml
- type: Authentication
  url: authentication/mediacaption-api-authentication.yml
- type: WellKnown
  url: well-known/mediacaption-api-well-known.yml
- type: Webhooks
  url: asyncapi/mediacaption-api-webhooks.yml
- type: MCPServer
  url: mcp/mediacaption-api-mcp.yml
- type: LLMsTxt
  url: llms/mediacaption-api-llms.txt
- type: Conformance
  url: conformance/mediacaption-api-conformance.yml
- type: ErrorCatalog
  url: errors/mediacaption-api-problem-types.yml
- type: Lifecycle
  url: lifecycle/mediacaption-api-lifecycle.yml
- type: ChangeLog
  url: changelog/mediacaption-api-changelog.yml
- type: ChangeLog
  url: https://www.mediacaption.io/docs/changelog
- type: Conventions
  url: conventions/mediacaption-api-conventions.yml
- type: DataModel
  url: data-model/mediacaption-api-data-model.yml
- type: Plans
  url: plans/mediacaption-api-plans-pricing.yml
- type: RateLimits
  url: rate-limits/mediacaption-api-rate-limits.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Pricing
  url: https://www.mediacaption.io/pricing
- type: Support
  url: https://www.mediacaption.io/report
- type: TermsOfService
  url: https://www.mediacaption.io/terms
- type: PrivacyPolicy
  url: https://www.mediacaption.io/privacy
x-enrichment:
  date: '2026-09-03'
  status: enriched
  artifacts_added: 22
  pass: local-v2

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