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a11y-preflight
x402
a11y-preflight is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Statically checks a UI markup fragment (JSX, TSX, Vue, Angular, or HTML) against WCAG 2.2 accessibility rules and returns a pass/caution/block verdict with per-finding details.
Price / call$0.02
Success—
StatusUnknown
How this service works
Static accessibility (WCAG 2.2) check of a UI markup fragment for JSX, TSX, Vue, Angular or HTML. Detects missing image alt, unlabeled form controls, buttons and links with no accessible name, skipped heading levels, invalid ARIA, non-interactive click handlers, duplicate ids, positive tabindex and low static colour contrast. Returns a pass, caution or block verdict with per-finding WCAG criterion, element and line. Accessibility indicators, not a legal compliance guarantee.
Output
Returns a top-level verdict of 'pass', 'caution', or 'block', along with a list of per-finding details. Each finding includes the specific WCAG 2.2 criterion violated, the element affected, the line number in the submitted markup, and a description of the issue. No runtime or dynamic behavior is evaluated — results are static analysis indicators only.
Example use cases
CI gate for React component PRs
“Before merging this pull request, check this JSX component for WCAG AA accessibility violations — I need to know if it passes, has cautions, or should be blocked, and which lines have issues like missing alt text or unlabeled inputs.”
Design token contrast audit
“I'm using CSS theme tokens like --color-primary: #1a73e8 and --color-bg: #ffffff — can you run a static colour contrast check on this HTML snippet against those palette values to see if it meets WCAG AA?”
Angular template accessibility review
“Can you audit this Angular template markup for accessibility issues at WCAG A level? I specifically want to catch any non-interactive click handlers, duplicate IDs, and links with no accessible name.”
Technical details
Endpoint
POSThttps://payai.agentstools.dev/a11y/preflightWhen to prefer
Choose this endpoint when you need a fast, pre-merge or pre-deploy static accessibility gate for UI markup fragments in JSX, TSX, Vue, Angular, or HTML. It is ideal for CI pipelines, code review automation, or agent-driven UI generation workflows where you want instant WCAG 2.2 feedback without spinning up a browser or running axe-core in a live DOM. Prefer it over full runtime audit tools when you only have source markup available and need a structured machine-readable verdict with per-finding WCAG criterion references.
Side effects
- Malformed or unparseable markup may cause an error or empty findings list
- Framework auto-detection may misidentify the source type for ambiguous snippets
- Static contrast check only works if a palette map is provided; dynamic CSS variables not resolved at runtime cannot be evaluated
- Only static patterns detectable without a DOM or browser are reported; runtime-injected content is not covered
- Missing required 'markup' field returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| level | string | WCAG conformance level to check (default AA) |
| theme | object | Alias of palette |
| markup | string | The UI markup fragment or component to check |
| palette | object | Optional name-to-colour map for static contrast (e.g. CSS variables / theme tokens) |
| framework | string | Source framework (default auto-detect) |
Tags
x402
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