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Sentinel402 PII & Secret Guardrail (scan_for_pii)
x402
Sentinel402 PII & Secret Guardrail (scan_for_pii) is a paid API for AI agents from pii-guardrail.chronokey.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-17).
Scans outbound text payloads for PII and secrets, returning a risk score, categorized findings, and optionally redacted/sanitized output.
Price / call$0.02
Success—
StatusUnknown
How this service works
Paid tools for AI agents over x402: a PII and secret guardrail that scans outbound payloads, live citable data (crypto, weather, GitHub, sports, FX), and an RCP/1 retrieval server backed by that live data.
Output
Returns a JSON object with a numeric risk score (0-100), a decision enum (allow/redact/block), a findings array with per-rule details including rule name, count, severity, confidence, and redacted samples, counts broken down by severity level, and optionally a sanitized string with PII tokens replaced.
Example use cases
Guard LLM output before delivery
“Check this AI-generated response for any leaked PII or credentials before we send it to the customer — use redact mode so anything sensitive gets masked: 'Hi John, your billing card 4111-1111-1111-1111 has been charged.'”
Compliance scan for logged payloads
“I need to scan this API request body for sensitive data before we write it to our logs — run it in block mode with a minimum severity of high so we stop anything critical: '{"email":"jane@example.com","ssn":"078-05-1120","message":"please process my order"}'”
Agent safety guardrail in workflow
“My AI agent just composed an outbound webhook payload — can you scan it in detect mode to get a risk score and list of any PII findings before I decide whether to send it? Here's the text: 'Customer Alice Brown, DOB 1985-03-12, passport MX1234567.'”
Technical details
Endpoint
POSThttps://pii-guardrail.chronokey.workers.dev/mcp?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, no-subscription PII and secret scanner that integrates directly into MCP-compatible agent pipelines via x402 micropayments. It is ideal for agent workflows that need an inline guardrail — scanning LLM outputs, API responses, or user-submitted text before forwarding — especially when you want severity-tiered findings with confidence scores and the option to auto-redact rather than just flag. Prefer it over static regex libraries when you need a managed, regularly updated ruleset without hosting infrastructure.
Side effects
- Missing or invalid payment credential returns HTTP 402 with payment-required details
- Text field absent or empty may return an error or trivial allow decision
- Invalid mode or min_severity enum value causes validation error
- Very large payloads may time out on the Cloudflare Worker edge
- If the MCP JSON-RPC envelope is malformed (wrong method, missing jsonrpc field), returns JSON-RPC error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"risk": 100,
"counts": {
"low": 0,
"high": 0,
"medium": 0,
"critical": 2
},
"decision": "redact",
"findings": [
{
"rule": "CREDIT_CARD",
"count": 1,
"samples": [
"[CREDIT_CARD:************4242]"
],
"severity": "critical",
"confidence": 0.99
},
{
"rule": "SSN_KEYWORD",
"count": 1,
"samples": [
"[SSN_KEYWORD:#ba9f03]"
],
"severity": "critical",
"confidence": 0.98
}
],
"sanitized": "card [CREDIT_CARD:************4242], [SSN_KEYWORD:#ba9f03]"
}
}Tags
x402
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