# WCAG Accessibility Checker (Static Analysis)

> WCAG Accessibility Checker (Static Analysis) is a paid API for AI agents from api.webbersites.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Performs static WCAG accessibility analysis on a public URL, mapping findings to A/AA/AAA success criteria across alt text, headings, ARIA, forms, and more

## Facts

- Endpoint: GET https://api.webbersites.com/api/a11y/check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wcag-accessibility-checker-static-analysis-6afa4335
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7hnxI6bu1URGFFOPQmkBl

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 wcag-accessibility-checker-static-analysis-6afa4335
```

Example prompt: Can you run a WCAG AA accessibility audit on https://example.com and show me all the findings — things like missing alt text, bad heading structure, unlabeled form fields, and broken ARIA roles?

## When to prefer this

Use this endpoint when you need WCAG-mapped accessibility findings with explicit success criterion references and conformance level tagging (A/AA/AAA). Prefer this over a generic alt-text-only audit (see sibling /api/a11y/alt) when you need broad coverage across heading structure, form labels, ARIA validity, link purpose, skip links, zoom blocking, and meta refresh. Best for pre-launch compliance checks, accessibility reports, and automated QA pipelines that need structured, standards-referenced output rather than raw heuristic scores.

## Known failure modes

- URL is not publicly accessible or returns non-2xx — analysis cannot be performed
- Invalid or malformed URL provided — request rejected
- Level filter value is not A, AA, or AAA — invalid parameter
- Page has no parseable HTML content — limited or empty findings
- Timeout fetching the target URL — partial or no results

## How this service works

WCAG accessibility check (static analysis): findings mapped to WCAG success criteria with A/AA/AAA levels — alt text, page title, lang, form labels, heading structure, table headers, link purpose, accessible names, duplicate IDs, ARIA role validity, zoom blocking, meta refresh, skip links. Filter with ?level=A|AA|AAA. Honestly reports what static analysis cannot check (contrast, focus, keyboard).

## Output

Returns a structured report with WCAG findings (each mapped to a specific success criterion and conformance level A/AA/AAA), aggregate totals by level and type, and a list of checks that static analysis cannot perform (e.g. color contrast, keyboard focus behavior). Optionally filtered to a specific WCAG level.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Public URL of the page to check"
      },
      "level": {
       "type": "string",
       "description": "Filter findings to A, AA, or AAA (includes lower levels)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "totals": {
       "type": "object"
      },
      "findings": {
       "type": "array"
      },
      "not_checked": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com",
  "totals": {
   "issues": 9,
   "by_level": {
    "A": 8,
    "AA": 1,
    "AAA": 0
   },
   "criteria_failed": 3
  },
  "findings": [
   {
    "name": "Non-text content",
    "count": 6,
    "level": "A",
    "detail": "Images without usable text alternatives.",
    "criterion": "1.1.1"
   }
  ],
  "not_checked": [
   "1.4.3 color contrast (needs rendering)"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wcag-accessibility-checker-static-analysis-6afa4335/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.webbersites.com](https://www.zero.xyz/host/api.webbersites.com/llms.txt)