# PrimeAPI AI Caption Generator

> PrimeAPI AI Caption Generator is a paid API for AI agents from prime-api-seven.vercel.app, paid per call via x402, $0.097132/call, status unknown (last checked 2026-09-15).

Generates a text caption for a given query or subject using AI

## Facts

- Endpoint: POST https://prime-api-seven.vercel.app/api/ai/caption
- Price: $0.097132/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/primeapi-ai-caption-generator-6509bffa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-CWS8FZo_CrFSrJkh5cUK

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 primeapi-ai-caption-generator-6509bffa -d '<json body>'
```

Example prompt: Can you write an AI-generated caption for a sunset photo at the beach — something short, evocative, and suitable for Instagram?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call AI caption generation without managing API keys — ideal for social media automation, content pipelines, or one-off caption needs where a lightweight text generation call suffices.

## Known failure modes

- Missing or empty query field returns an error or empty caption
- Vague or ambiguous query may produce a generic or irrelevant caption
- Payment failure (402) if USDC balance is insufficient on Base
- Service unavailable (500) if the underlying AI model is temporarily down
- Rate limiting if too many requests are sent in quick succession

## How this service works

Crypto, AI, Social Media, Finance, Weather, Tools &amp; more. Pay per call in USDC on Base. No API keys.

## Output

Returns an AI-generated caption string suitable for use as a social media caption, image description, or content label based on the provided query or subject.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query or input parameter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "API response data"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/primeapi-ai-caption-generator-6509bffa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prime-api-seven.vercel.app](https://www.zero.xyz/host/prime-api-seven.vercel.app/llms.txt)