# Sift Subtitle Translation Checker

> Sift Subtitle Translation Checker is a paid API for AI agents from sift.srv1996466.hstgr.cloud, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-23).

Compares a translated subtitle file against its original, scoring translation quality and flagging mistranslations, timing issues, and reading speed problems

## Facts

- Endpoint: GET https://sift.srv1996466.hstgr.cloud/v1/yt/check-subtitles?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sift-subtitle-translation-checker-bae0bbc2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nDNX8QvEfsW-_o-hPznVp

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sift-subtitle-translation-checker-bae0bbc2
```

Example prompt: Can you check my Spanish subtitle translation against the English original? The source is at https://example.com/episode1.srt and the translation is at https://example.com/episode1-es.srt — give me a quality score and flag anything that looks wrong.

## When to prefer this

Choose this endpoint when you need a detailed, cue-by-cue review of a subtitle translation rather than just a generic text diff or spell-check. It is the right tool when you care about both linguistic accuracy (mistranslation, omission, grammar, naturalness) and technical subtitle quality (timing, reading speed, line length) in a single pass, and when you need actionable corrections per flagged cue. Works across any language pair including less common ones like Ukrainian.

## Known failure modes

- Inaccessible URL returns error if subtitle file cannot be fetched
- Unsupported file format if URL does not point to .srt or .vtt
- File too large or too many cues may time out
- Unrecognized language pair may reduce accuracy of linguistic checks
- Missing required source_url or translated_url returns validation error

## How this service works

Check a translated subtitle file against the original: meaning, grammar, timing, reading speed. Give the URLs of the original .srt or .vtt and its translation. A reviewer reads every cue pair and returns a 0-100 score, a verdict and only the cues that need attention (mistranslation, omission, grammar, spelling, unnatural phrasing) with a suggested correction, plus technical checks: cue count, timing drift, reading speed, line length. Works across any language pair, including Ukrainian.

## Output

Returns a 0-100 quality score, a short verdict string, an array of flagged cue objects (each with cue index, issue type, problem description, severity, and suggested correction), and a technical_issues array covering cue count mismatches, timing drift, reading speed violations, and line length problems.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "source_url",
      "translated_url"
     ],
     "properties": {
      "source_url": {
       "type": "string",
       "description": "Original subtitle file URL"
      },
      "translated_url": {
       "type": "string",
       "description": "Translated subtitle file URL"
      },
      "source_language": {
       "type": "string",
       "description": "Language of the original"
      },
      "target_language": {
       "type": "string",
       "description": "Language of the translation"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "score": 88,
  "verdict": "needs a few fixes",
  "language_issues": [
   {
    "cue": 3,
    "type": "unnatural",
    "problem": "literal phrasing",
    "severity": "minor",
    "suggestion": "..."
   }
  ],
  "technical_issues": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sift-subtitle-translation-checker-bae0bbc2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sift.srv1996466.hstgr.cloud](https://www.zero.xyz/host/sift.srv1996466.hstgr.cloud/llms.txt)