# X402 Hub Alt Text Generator

> X402 Hub Alt Text Generator is a paid API for AI agents from x402-hub.vercel.app, paid per call via x402, $0.075/call, status unknown (last checked 2026-10-01).

Generates descriptive alt text for images using AI, paid via x402 micropayments on Base

## Facts

- Endpoint: POST https://x402-hub.vercel.app/api/alt-text?utm_source=zero.xyz
- Price: $0.075/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-hub-alt-text-generator-9b70196f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MKYFBbRkPjhBySORmrawI

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 x402-hub-alt-text-generator-9b70196f -d '<json body>'
```

Example prompt: Generate alt text for this product image so I can make my website accessible: https://example.com/images/red-sneaker.jpg

## When to prefer this

Choose this endpoint when you need to programmatically generate alt text for images at scale, especially in automated pipelines where accessibility compliance is required. Ideal for e-commerce platforms, CMS integrations, or any workflow where images lack descriptive metadata and WCAG compliance is needed. Best suited for agents that can handle x402 micropayments on Base.

## Known failure modes

- Invalid or inaccessible image URL returns an error
- Image format not supported by the underlying vision model
- Insufficient USDC balance or x402 payment failure prevents the call
- Query parameter missing causes a 400 validation error
- Rate limiting or upstream model unavailability causes a 503

## How this service works

63 paid API endpoints protected by x402 micropayments on Base

## Output

Returns a text description of the image suitable for use as HTML alt text, providing an accessible, human-readable summary of the image content for screen readers and WCAG compliance purposes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "query": {
   "type": "string",
   "description": "Query parameter for the API"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "description": "Response data from upstream API"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-hub-alt-text-generator-9b70196f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-hub.vercel.app](https://www.zero.xyz/host/x402-hub.vercel.app/llms.txt)