# Saylor Innovations Accessible Tap Target Checker

> Saylor Innovations Accessible Tap Target Checker is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Checks whether a UI tap target's width, height, and spacing meet WCAG AA and enhanced accessibility thresholds

## Facts

- Endpoint: GET https://saylorinnovations.com/api/accessibility/tap-target?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/saylor-innovations-accessible-tap-target-checker-071d35bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XuQz0IRHNxzPKfJnnOAhA

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 saylor-innovations-accessible-tap-target-checker-071d35bd
```

Example prompt: Can you check if a tap target that is 36 pixels wide, 40 pixels tall, and has 6 pixels of spacing to the nearest adjacent element passes WCAG AA and enhanced target size requirements?

## When to prefer this

Choose this endpoint when you need a quick, programmatic WCAG tap target size check (AA or enhanced) based purely on pixel dimensions and spacing — ideal for automated accessibility audits, CI/CD pipelines, or design review tools where you already have the CSS pixel measurements and need a standards-grounded pass/fail result without running a full browser-based audit.

## Known failure modes

- Missing required query parameters (width_px, height_px, or spacing_px) results in an error response
- Non-numeric or negative values for width or height may be rejected
- Negative spacing_px values are invalid and will likely cause an error
- Payment not included or invalid x402 payment header results in 402 Payment Required

## How this service works

Tap target size checker from width, height and spacing - WCAG threshold flags

## Output

Returns a JSON object containing the input dimensions (width_px, height_px, spacing_px), the computed short_side_px, boolean flags for wcag_aa_target_size and enhanced_target_size compliance, the formula applied in the calculation, and a scope_note explaining what the result covers and excludes.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "width_px",
      "height_px",
      "spacing_px"
     ],
     "properties": {
      "width_px": {
       "type": "string",
       "description": "required positive target width in CSS pixels (query)"
      },
      "height_px": {
       "type": "string",
       "description": "required positive target height in CSS pixels (query)"
      },
      "spacing_px": {
       "type": "string",
       "description": "required non-negative spacing to nearest adjacent target in CSS pixels (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "width_px",
      "height_px",
      "spacing_px",
      "short_side_px",
      "wcag_aa_target_size",
      "enhanced_target_size",
      "scope_note"
     ],
     "properties": {
      "formula": {
       "type": "string",
       "description": "Formula used for the calculation"
      },
      "width_px": {
       "type": "number",
       "description": "Width px"
      },
      "height_px": {
       "type": "number",
       "description": "Height px"
      },
      "scope_note": {
       "type": "string",
       "description": "What this data covers and what it leaves out"
      },
      "spacing_px": {
       "type": "number",
       "description": "Spacing px"
      },
      "short_side_px": {
       "type": "number",
       "description": "Short side px"
      },
      "wcag_aa_target_size": {
       "type": "boolean",
       "description": "Wcag aa target size"
      },
      "enhanced_target_size": {
       "type": "boolean",
       "description": "Enhanced target size"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-accessible-tap-target-checker-071d35bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)