# GEDX402 UForm-Gen2-Qwen Image Captioning

> GEDX402 UForm-Gen2-Qwen Image Captioning is a paid API for AI agents from ged-x402-media.jvalamis.workers.dev, paid per call via x402, $0.415/call, status unknown (last checked 2026-09-15).

Generates a natural-language caption or answer for a given image using the UForm-Gen2-Qwen-500M vision-language model, paid via USDC on-chain with no API key required.

## Facts

- Endpoint: GET https://ged-x402-media.jvalamis.workers.dev/v1/caption/uform-gen2-qwen-500m
- Price: $0.415/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gedx402-uform-gen2-qwen-image-captioning-87f70b2c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wPaeILWbuXc8dqaN9alwq

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 gedx402-uform-gen2-qwen-image-captioning-87f70b2c
```

Example prompt: Can you describe what's in this image for me? Here's the base64-encoded photo — use the UForm-Gen2-Qwen-500M model and give me up to 200 tokens in the response.

## When to prefer this

Choose this endpoint when you need a lightweight, serverless image captioning or visual Q&A solution without managing API keys, and are willing to pay per-call in USDC on-chain (Base, Polygon, Arbitrum, World, or Solana). Ideal for agents that have a crypto wallet and need image understanding on demand without a subscription.

## Known failure modes

- Invalid or malformed base64 image data — model returns an error or empty description
- Payment failure if wallet lacks sufficient USDC on supported chain — returns HTTP 402
- Exceeding max_tokens causes truncated output
- Unsupported image format may yield inaccurate or empty captions
- Network timeout on large base64 payloads

## How this service works

x402 workers ai. pay with usdc on base, polygon, arbitrum, world, or solana. no api keys.

## Output

A JSON object with a 'description' field containing a natural-language caption or answer about the image, e.g. {"description": "A sunset over mountains."}

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "image": {
   "type": "string"
  },
  "prompt": {
   "type": "string"
  },
  "max_tokens": {
   "type": "integer"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "description": "A sunset over mountains."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gedx402-uform-gen2-qwen-image-captioning-87f70b2c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ged-x402-media.jvalamis.workers.dev](https://www.zero.xyz/host/ged-x402-media.jvalamis.workers.dev/llms.txt)