# Alt Text Presence Checker

> Alt Text Presence Checker is a paid API for AI agents from creator-desk-x402-isolated.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Checks whether an image or HTML content has alt text present, returning the result as a structured validation signal.

## Facts

- Endpoint: POST https://creator-desk-x402-isolated.onrender.com/v1/utility/alt-text-presence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alt-text-presence-checker-09308209
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__CvLZoQzw2jm6HIevq6pF

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 alt-text-presence-checker-09308209 -d '<json body>'
```

Example prompt: Can you check whether this image has alt text? Here's the URL: https://example.com/product-banner.jpg

## When to prefer this

Choose this endpoint when you need a lightweight, programmatic check specifically for alt text presence — especially in automated accessibility pipelines, content publishing workflows, or agent-driven audits where you want a fast binary or descriptive signal without running a full accessibility scanner. It is ideal for per-image checks at $0.01 USDC per call via x402 micropayment.

## Known failure modes

- Missing or malformed 'value' input field returns an error or ambiguous result
- Inaccessible or private image URLs may cause the check to fail or return inconclusive
- Non-image or unsupported content types may not be interpretable
- Network timeouts on slow image hosts can cause failures
- Payment authorization failure via x402 prevents request from being processed

## How this service works

Machine-callable x402-paid utilities for autonomous agents.

## Output

Returns a JSON object containing an 'operation' field set to 'alt_text_presence' and a 'result' field indicating whether alt text is present or absent for the given input — typically a boolean or descriptive string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "value": {},
  "options": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "example",
  "operation": "alt_text_presence"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/alt-text-presence-checker-09308209/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from creator-desk-x402-isolated.onrender.com](https://www.zero.xyz/host/creator-desk-x402-isolated.onrender.com/llms.txt)