# SRT Caption Preflight Offline Subtitle QA

> SRT Caption Preflight Offline Subtitle QA is a paid API for AI agents from speedbot.dev, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-18).

Purchases and delivers a dependency-free Python 3 CLI tool that validates SubRip (.srt) caption files for cue structure, timestamps, and overlaps

## Facts

- Endpoint: POST https://speedbot.dev/api/products/product_7d03d106958743c9a546d331950fdd8a/versions/version_d3f9015be95c4771baa8626f3b08debf/buy?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/srt-caption-preflight-offline-subtitle-qa-da9e8ec1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FdzR51Yp9FbkF6KEoGIiA

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 srt-caption-preflight-offline-subtitle-qa-da9e8ec1 -d '<json body>'
```

Example prompt: Buy me the SRT Caption Preflight offline subtitle QA tool from Speedbot — my email is user@example.com and I consent to immediate digital delivery. Generate a checkout key and request ID for the purchase.

## When to prefer this

Choose this endpoint when you need to acquire a self-contained, offline Python 3 tool for validating SRT subtitle files without any external runtime dependencies. It is appropriate when your environment requires air-gapped or offline operation, when you want commercial use rights to a subtitle QA CLI, and when you need checks for cue structure, timestamp ordering, and caption overlaps in SubRip format specifically.

## Known failure modes

- Invalid email format returns validation error
- checkout_key not 64 hex characters returns schema rejection
- request_id shorter than 16 characters returns rejection
- digital_delivery_consent not explicitly true blocks purchase
- Duplicate request_id on retry may indicate already-processed purchase
- Insufficient USDC balance causes payment failure

## How this service works

SRT Caption Preflight Offline Subtitle QA. SRT Caption Preflight is a read-only, dependency-free Python 3 CLI that checks common SubRip cue structure and timestamps, overlaps, short duration First approved purchase: 0.01 USDC total where maker terms permit; later 0.5 USDC plus tax. Stored ZIP download; commercial use, no redistribution. Verified by Speedbot for this version. Generate a private checkout_key and request_id; email and delivery consent required.

## Output

A stored ZIP archive download containing a dependency-free Python 3 CLI for offline SubRip caption quality assurance, covering cue structure checks, timestamp validation, and overlap detection. The purchase is confirmed via receipt to the provided email.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$",
   "description": "Your receipt/recovery email; required when paying, never copied to the facilitator."
  },
  "request_id": {
   "type": "string",
   "maxLength": 100,
   "minLength": 16,
   "description": "Generate a unique purchase identifier and retain on every retry."
  },
  "checkout_key": {
   "type": "string",
   "pattern": "^[a-fA-F0-9]{64}$",
   "writeOnly": true,
   "description": "Generate 32 private random bytes as 64 hex characters. Required when paying. Retain on every retry."
  },
  "digital_delivery_consent": {
   "type": "boolean",
   "const": true,
   "description": "Required for a purchase: request immediate digital delivery and acknowledge the applicable withdrawal consequence."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/srt-caption-preflight-offline-subtitle-qa-da9e8ec1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from speedbot.dev](https://www.zero.xyz/host/speedbot.dev/llms.txt)