FastX402 Subtitle VTT/SRT Parser

x402

FastX402 Subtitle VTT/SRT Parser is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-28).

Parses SRT or WebVTT subtitle file content into structured timed blocks and plain text

Price / call$0.001

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StatusUnknown

How this service works

200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.

Output

Returns a JSON object containing an array of timed subtitle blocks (each with 'start', 'end', and 'text' fields in HH:MM:SS.mmm format) and a 'plain_text' field with all subtitle text joined by newlines, stripped of timing information.

Example use cases

Extract transcript from video subtitles

“I have this SRT subtitle file content from a YouTube video — can you parse it and give me the plain text transcript without all the timestamps? Here's the content: '1 00:00:01,000 --> 00:00:04,000 Welcome to the tutorial 2 00:00:05,000 --> 00:00:09,000 Today we will learn about Python'”

Build searchable subtitle index

“Parse this WebVTT subtitle file into structured blocks with start times, end times, and text so I can build a searchable index: 'WEBVTT 00:00:00.500 --> 00:00:02.000 Chapter one begins here 00:00:03.000 --> 00:00:06.500 The protagonist enters the scene'”

Sync captions to media player

“I need to convert this SRT caption content into structured JSON with start and end timestamps for each line so my media player can sync them — here's the raw content: '1 00:00:00,800 --> 00:00:03,200 Good morning everyone 2 00:00:04,100 --> 00:00:07,000 Let's get started'”

Technical details

Endpoint

GEThttps://fastx402.tools/subtitles-vtt-parse?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need to programmatically parse SRT or WebVTT subtitle file content into structured JSON without setting up an account or API key — ideal for lightweight, pay-per-call subtitle processing in agent workflows where you occasionally need to convert caption files to timed blocks or plain text transcripts.

Side effects

Malformed or invalid SRT/WebVTT syntax may produce incomplete or empty block arrays
Missing 'content' query parameter returns an error
Non-subtitle text content passed as input may return empty blocks or garbled output
Very large subtitle files may hit query string length limits when passed as a GET parameter

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "blocks": [
      {
        "end": "00:00:04.000",
        "text": "Hello world",
        "start": "00:00:01.000"
      },
      {
        "end": "00:00:08.000",
        "text": "This is a test",
        "start": "00:00:05.000"
      }
    ],
    "plain_text": "Hello world\nThis is a test"
  }
}

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