The Subtitle Lint API from WritersLogic Verifiable AI Agent Hub — 1 operation(s) for subtitle lint.
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openapi: 3.2.0
info:
title: WritersLogic Verifiable AI Agent Hub Subtitle Lint API
version: 2.0.0
description: Pay-per-call agents settled in USDC on Base via x402. Every response carries a signed provenance envelope.
contact:
name: WritersLogic
url: https://writerslogic.com/agents
email: agents@writerslogic.com
servers:
- url: https://agents.writerslogic.com
tags:
- name: Subtitle Lint
paths:
/api/v1/subtitle-lint:
post:
operationId: subtitle_lint
summary: 'Subtitle lint: SRT and WebVTT overlaps, duration, reading speed, line length'
description: 'Parses an SRT or WebVTT file (up to 400000 characters, 4000 cues) and checks every cue for an agent about to deliver or burn in captions: end after start, overlaps and out-of-order cues, minimum gap, minimum and maximum duration, lines per cue, characters per line and characters per second (markup tags are not counted). Rules come from a named profile (netflix-en-adult, netflix-en-children, values quoted from the Netflix Partner Help Center with page URLs) or from your own custom values; with neither it checks structure only and answers unknown. It does not judge translation quality, shot changes, positioning or languages other than the profile''s own, and does not read ASS/SSA or TTML.
Price: 0.005 USDC on Base (x402).'
x-x402-price-usdc: '0.005'
x-x402-amount: '5000'
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.005'
x-audience: business
x-sample-url: https://agents.writerslogic.com/api/v1/samples/subtitle-lint
security:
- x402: []
- apiKey: []
requestBody:
required: true
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- text
properties:
text:
type: string
minLength: 1
maxLength: 400000
description: The whole .srt or .vtt file.
format:
type: string
enum:
- srt
- vtt
description: 'Default: vtt if the text starts with WEBVTT, else srt.'
profile:
type: string
enum:
- netflix-en-adult
- netflix-en-children
description: 'netflix-en-adult: 42 chars/line, 2 lines, 20 cps, 5/6 s to 7 s, 2-frame gap. netflix-en-children: same at 17 cps.'
custom:
type: object
properties:
maxLinesPerCue:
type: integer
minimum: 1
maximum: 20
maxCharsPerLine:
type: integer
minimum: 1
maximum: 500
maxCps:
type: number
minimum: 1
maximum: 100
minDurationMs:
type: number
minimum: 0
maximum: 60000
maxDurationMs:
type: number
minimum: 1
maximum: 600000
minGapFrames:
type: number
minimum: 0
maximum: 100
minGapMs:
type: number
minimum: 0
maximum: 60000
description: Your own rules; these override profile values.
frameRate:
type: number
minimum: 1
maximum: 240
description: Needed to turn a minimum gap in frames into milliseconds.
example:
text: '1
00:00:01,000 --> 00:00:03,000
Hello there.
2
00:00:02,500 --> 00:00:04,000
Overlapping cue.
'
profile: netflix-en-adult
frameRate: 24
responses:
'200':
description: Paid result with provenance
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
status:
type: string
enum:
- pass
- fail
- unknown
- unsupported
description: 'pass: every rule held. fail: a rule was violated (see witnesses). unknown: the input lacks the evidence to decide. unsupported: outside what this engine covers. Missing evidence is never a pass.'
format:
type: string
profile:
type: string
appliedRules:
type: object
description: The rule values actually applied.
properties:
maxLinesPerCue:
type: integer
minimum: 1
maximum: 20
maxCharsPerLine:
type: integer
minimum: 1
maximum: 500
maxCps:
type: number
minimum: 1
maximum: 100
minDurationMs:
type: number
minimum: 0
maximum: 60000
maxDurationMs:
type: number
minimum: 1
maximum: 600000
minGapFrames:
type: number
minimum: 0
maximum: 100
minGapMs:
type: number
minimum: 0
maximum: 60000
cueCount:
type: integer
violationCounts:
type: object
description: Violations per rule id.
maxCps:
anyOf:
- type: number
description: Highest reading speed in the file, characters per second.
- type: 'null'
skippedRules:
type: array
items:
type: string
witnessesTruncated:
type: boolean
description: True when more than 200 violations were found; counts are still complete.
witnesses:
type: array
items:
type: object
properties:
ruleId:
type: string
detail:
type: string
path:
type: string
description: JSON pointer or dotted path into the input.
offset:
type: integer
index:
type: integer
expected:
description: What the rule required.
actual:
description: What the input had.
versions:
type: object
description: Every semantic dependency of this answer (engine, tables and their as-of dates, tokenizer, calendar, rounding profile).
limits:
type: array
items:
type: string
deterministic:
type: boolean
description: 'Always true: pure code, no model.'
_provenance:
type: object
description: C2PA-aligned manifest and W3C VC 2.0 (eddsa-jcs-2022) issued by the hub DID; verify at POST /api/v1/verify-provenance
required:
- data
- _provenance
'400':
description: Invalid request (no payment consumed)
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'401':
description: Invalid X-API-KEY
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
'402':
description: Payment required or invalid
content:
application/json:
schema:
type: object
description: x402 v2 PaymentRequired (also base64 in the PAYMENT-REQUIRED header)
properties:
x402Version:
type: integer
error:
type: string
code:
type: string
resource:
type: object
accepts:
type: array
items:
type: object
extensions:
type: object
'502':
description: Upstream failure; the payment is released or not settled
content:
application/json:
schema:
type: object
properties:
error:
type: string
code:
type: string
tags:
- Subtitle Lint
components:
securitySchemes:
x402:
type: apiKey
in: header
name: PAYMENT-SIGNATURE
description: x402 v2 payment payload (base64) sent after a 402 challenge
apiKey:
type: apiKey
in: header
name: X-API-KEY