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Unveil Prompt Injection Scanner (URL)
x402
Unveil Prompt Injection Scanner (URL) is a paid API for AI agents from unveil.x402utils.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Fetches a URL and scans the retrieved content for hidden prompt injection attacks targeting AI agents, returning severity-graded findings with SHA-256 evidence hashes but never the matched text itself.
Price / call$0.005
Success—
StatusUnknown
How this service works
Scan untrusted text or URLs for hidden prompt injection before an AI agent reads them: invisible Unicode, tag-character smuggling, bidi overrides, terminal escapes, instructions in HTML comments or CSS-hidden elements, secret-exfiltration requests, text addressed to AI readers. Matched text is never returned (sha256 only). Paid per call via x402, USDC on Base.
Output
A JSON object containing a top-level verdict ('safe', 'suspicious', or 'dangerous'), a counts object with low/medium/high finding tallies, and a findings array. Each finding includes the rule ID (e.g. UNV002), a human-readable title, line and column, severity, evidence length, and a SHA-256 hash of the matched text — the actual matched content is never returned.
Example use cases
Safe ingestion of user-submitted URLs
“A user just pasted this link for me to summarize: https://pastebin.com/abc123. Before you read and process it, scan it with Unveil to check for hidden prompt injection, bidi overrides, or invisible tag characters that could hijack you.”
Vetting third-party API docs for agents
“I'm about to let my agent read the API docs at https://docs.somevendor.com/integration-guide to extract configuration steps — first run that URL through Unveil's injection scanner to make sure there are no CSS-hidden or HTML-comment instructions targeting AI readers.”
Auditing GitHub issue before automated triage
“Before my support bot processes the GitHub issue at https://github.com/myorg/myrepo/issues/4217, scan that URL with Unveil to detect any secret-exfiltration requests, Unicode smuggling, or AI-addressed instructions hidden in the page.”
Technical details
Endpoint
GEThttps://unveil.x402utils.workers.dev/v1/scan-url?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to consume content from an untrusted or user-supplied URL and you want to guard against prompt injection before processing. It is distinct from text-based scanning because it fetches the remote resource itself, including rendered HTML, comments, and CSS-hidden elements that a raw text scan would miss. Prefer it over generic content-moderation APIs when the threat model specifically involves adversarial instructions targeting AI agents rather than human-facing harmful content.
Side effects
- URL exceeds 1 MB page size limit — request rejected
- URL is unreachable or returns non-2xx status — fetch error returned
- Invalid or non-HTTP(S) URL provided — schema validation error
- Payment not completed via x402/USDC — 402 Payment Required response
- Method not in allowed enum (GET, HEAD, DELETE) — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"counts": {
"low": 0,
"high": 1,
"medium": 0
},
"verdict": "dangerous",
"findings": [
{
"line": 1,
"rule": "UNV002",
"title": "Unicode tag-character smuggling",
"column": 6,
"detail": "16 tag characters decode to a withheld payload",
"severity": "high",
"evidence_length": 41,
"evidence_sha256": "3f1c…"
}
]
}
}Tags
x402
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