# NexusAPI AI Caption Generator

> NexusAPI AI Caption Generator is a paid API for AI agents from nexus-api-peach-nine.vercel.app, paid per call via x402, $0.097132/call, status unknown (last checked 2026-09-14).

Generates a descriptive or creative caption for a given query or image concept using AI

## Facts

- Endpoint: POST https://nexus-api-peach-nine.vercel.app/api/ai/caption
- Price: $0.097132/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexusapi-ai-caption-generator-15ce8e17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JZIgtYFn4HWFbxI8gZqc8

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 nexusapi-ai-caption-generator-15ce8e17 -d '<json body>'
```

Example prompt: Generate an AI caption for a photo of a golden retriever playing on the beach at sunset — something upbeat and suitable for an Instagram post.

## When to prefer this

Use this endpoint when you need to quickly generate AI-written captions for images, social media posts, or content based on a text prompt, and want to pay per call without managing API keys. Best for agents that need on-demand captioning without a standing subscription.

## Known failure modes

- Empty or missing query field returns a 400 bad request error
- Payment not completed returns 402 Payment Required
- Ambiguous or too-short query may produce a generic or low-quality caption
- Service unavailable returns 500 internal server error
- Rate limiting or quota exceeded may return 429 Too Many Requests

## 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 based on the input query or image concept, suitable for use in social media posts, product listings, or image descriptions.

## 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/nexusapi-ai-caption-generator-15ce8e17/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-api-peach-nine.vercel.app](https://www.zero.xyz/host/nexus-api-peach-nine.vercel.app/llms.txt)