# fastapi.online — Product Description Generator

> fastapi.online — Product Description Generator is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Generates a product description from a list of features and an optional tone specification

## Facts

- Endpoint: POST https://api.fastapi.online/product-description
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-product-description-generator-4e7066c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_r8eW-Q5zI_reP7rve8qDo

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 fastapi-online-product-description-generator-4e7066c8 -d '<json body>'
```

Example prompt: Write me a professional product description for a wireless noise-cancelling headphone with features: 40-hour battery life, active noise cancellation, Bluetooth 5.3, foldable design, and USB-C charging — use a confident, enthusiastic tone.

## When to prefer this

Choose this endpoint when you need cheap ($0.001/call), no-signup product description generation using a self-hosted AI, especially when privacy or crypto-payment compatibility matters. Prefer it over OpenAI or cloud-based copywriting APIs when cost-per-call optimization is critical at scale, or when you want to pay anonymously with USDC crypto. Best for batch product catalog generation pipelines where per-call cost adds up.

## Known failure modes

- Missing or empty 'features' field returns a validation error
- 'tone' value exceeding 40 characters may be rejected
- Very long feature strings (>4000 chars) will be truncated or rejected
- Self-hosted model may produce inconsistent quality on niche or technical products
- No response or timeout if the self-hosted inference server is overloaded

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.

## Output

A ready-to-use product description paragraph or short-form copy, generated by a self-hosted AI model, tailored to the provided features and tone. Returned as text, suitable for use in product listings, marketing pages, or catalogs.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tone": {
   "type": "string",
   "maxLength": 40
  },
  "features": {
   "type": "string",
   "maxLength": 4000,
   "minLength": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-product-description-generator-4e7066c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)