MediaCaption API Transcriptions API
Retained transcript lookup endpoints.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Media Caption Public Transcriptions API
version: 1.0.0
description: 'Public API for reading account and credit balance details, fetching YouTube
transcripts, creating bulk transcript jobs, polling jobs, retrieving retained
transcriptions, and receiving job-level webhooks.'
contact:
name: Media Caption
url: https://mediacaption.io
license:
name: Proprietary
url: https://mediacaption.io/terms
servers:
- url: https://api.mediacaption.io/v1
description: Production
security:
- bearerApiKey: []
- headerApiKey: []
tags:
- name: Transcriptions
description: Retained transcript lookup endpoints.
paths:
/transcriptions:
post:
tags:
- Transcriptions
summary: Transcribe media already in cloud storage
description: 'Inspects the HTTPS source without persisting the media, verifies its size and
duration, charges the exact transcription credits, and then passes the URL
directly to ElevenLabs Scribe. The source must be no larger than 3 GB
(3,000,000,000 bytes) and remain accessible while ElevenLabs fetches it.'
operationId: createCloudTranscription
security:
- bearerApiKey: []
- headerApiKey: []
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CloudTranscriptionRequest'
responses:
'202':
description: Transcription queued
headers:
Location:
schema:
type: string
X-Request-Id:
$ref: '#/components/headers/XRequestId'
content:
application/json:
schema:
$ref: '#/components/schemas/CloudTranscriptionAcceptedResponse'
'400':
$ref: '#/components/responses/InvalidRequest'
'401':
$ref: '#/components/responses/Unauthorized'
'402':
$ref: '#/components/responses/InsufficientCredits'
'413':
description: Remote media exceeds the 3 GB limit
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
'429':
$ref: '#/components/responses/RateLimited'
'500':
$ref: '#/components/responses/InternalError'
/transcriptions/{id}:
get:
tags:
- Transcriptions
summary: Fetch a retained transcription
description: Fetches queued, processing, failed, or completed transcription state by account-owned access ID. Transcript bodies are retained for 3 days.
operationId: getTranscription
security:
- bearerApiKey: []
- headerApiKey: []
parameters:
- name: id
in: path
required: true
schema:
type: string
pattern: ^tr_[0-9a-fA-F-]{36}$
example: tr_3f6e5c6a-0d31-4f8c-9b1d-7f3b9e6a2c11
responses:
'200':
description: Transcription found
headers:
X-Request-Id:
$ref: '#/components/headers/XRequestId'
content:
application/json:
schema:
$ref: '#/components/schemas/Transcription'
'400':
$ref: '#/components/responses/InvalidRequest'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'410':
$ref: '#/components/responses/TranscriptionExpired'
'429':
$ref: '#/components/responses/RateLimited'
'500':
$ref: '#/components/responses/InternalError'
components:
schemas:
CloudTranscriptionRequest:
type: object
additionalProperties: false
required:
- sourceUrl
properties:
sourceUrl:
type: string
format: uri
maxLength: 8192
description: Public or presigned HTTPS URL for an existing cloud media object.
filename:
type: string
maxLength: 400
description: Optional display filename; defaults to the URL path basename.
ErrorCode:
type: string
enum:
- concurrent_job_limit_exceeded
- geo_restricted
- invalid_api_key
- invalid_request
- insufficient_credits
- internal_error
- missing_api_key
- not_found
- public_api_rate_limited
- single_transcript_rate_limited
- transcription_expired
- transcript_unavailable
- video_unavailable
- webhook_not_found
- youtube_blocked
- youtube_rate_limited
TranscriptSegment:
type: object
additionalProperties: false
required:
- startSec
- durationSec
- text
properties:
startSec:
type: number
minimum: 0
example: 0
durationSec:
type: number
minimum: 0
example: 2.4
text:
type: string
example: Example transcript text
Transcription:
type: object
additionalProperties: false
required:
- transcriptionId
- source
- status
- language
- sourceUrl
- durationSec
- expiresAt
- createdAt
- completedAt
- transcript
properties:
transcriptionId:
type: string
source:
type: string
enum:
- public
- ai
status:
type: string
enum:
- queued
- processing
- completed
- failed
language:
type: string
sourceUrl:
type: string
format: uri
durationSec:
type:
- number
- 'null'
expiresAt:
type: string
format: date-time
createdAt:
type: string
format: date-time
completedAt:
type:
- string
- 'null'
format: date-time
transcript:
type:
- array
- 'null'
items:
$ref: '#/components/schemas/TranscriptSegment'
error:
type: string
ErrorResponse:
type: object
additionalProperties: false
required:
- error
properties:
error:
type: object
additionalProperties: false
required:
- code
- message
properties:
code:
$ref: '#/components/schemas/ErrorCode'
message:
type: string
CloudTranscriptionAcceptedResponse:
type: object
additionalProperties: false
required:
- transcriptionId
- status
- sourceUrl
- durationSec
- sizeBytes
- requiredCredits
- statusUrl
properties:
transcriptionId:
type: string
status:
type: string
enum:
- queued
sourceUrl:
type: string
format: uri
description: Query-free source URL; signed credentials are never returned.
durationSec:
type: integer
sizeBytes:
type: integer
maximum: 3000000000
requiredCredits:
type: integer
statusUrl:
type: string
responses:
RateLimited:
description: Rate limit exceeded
headers:
Retry-After:
$ref: '#/components/headers/RetryAfter'
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
Unauthorized:
description: Missing or invalid API key
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
examples:
missing:
value:
error:
code: missing_api_key
message: Missing API key.
invalid:
value:
error:
code: invalid_api_key
message: Invalid API key.
NotFound:
description: Resource not found
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
InsufficientCredits:
description: Not enough credits to start processing
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
example:
error:
code: insufficient_credits
message: Insufficient credits.
InternalError:
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
InvalidRequest:
description: Invalid request
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
TranscriptionExpired:
description: Transcription retention window has ended
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
example:
error:
code: transcription_expired
message: This transcription has expired and is no longer available.
headers:
RetryAfter:
description: Seconds to wait before retrying.
schema:
type: integer
example: 30
XRequestId:
description: Request ID for troubleshooting.
schema:
type: string
example: req_01jz7mb36gp7h2nm5rwd1ah4zz
securitySchemes:
bearerApiKey:
type: http
scheme: bearer
bearerFormat: Media Caption API key
description: 'Use `Authorization: Bearer mc_live_xxx`.'
headerApiKey:
type: apiKey
in: header
name: X-API-Key
description: Alternative API key header.