# Expect-CT Response Header Inspector

> Expect-CT Response Header Inspector is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Checks whether the Expect-CT HTTP response header is present on a given URL, returns its raw value, and provides a plain-English interpretation of its security implications.

## Facts

- Endpoint: GET https://site.intel.rallylive.ca/site/header/expect-ct?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/expect-ct-response-header-inspector-e3970369
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DQmOK1MkvWftW0Yg9mB9C

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 expect-ct-response-header-inspector-e3970369
```

Example prompt: Can you check whether https://example.com has the Expect-CT response header set, what its value is, and whether the configuration looks secure?

## When to prefer this

Choose this endpoint when you specifically need to inspect the Expect-CT HTTP response header in isolation for auditing, monitoring, or compliance purposes. It is ideal for automated security scans, CI/CD pipeline checks, or lightweight monitoring scripts that need a per-header answer with a plain-English risk summary, without the overhead of a full security header analysis suite.

## Known failure modes

- Target URL is unreachable or returns a network error, resulting in no header data
- URL is malformed or not provided, causing a request validation failure
- Target server returns an unexpected response format
- Rate limits or payment verification failure preventing the check from completing

## How this service works

The expect-ct response header of a URL: whether it is present, its value, and a one-line reading of what the value means (or the risk of its absence for security headers). One header, one answer, for audits and monitoring scripts. $0.01 per check.

## Output

Returns whether the Expect-CT header is present on the target URL's HTTP response, its raw header value if found, and a one-line human-readable interpretation of the value's security meaning or an explanation of the security risk posed by its absence.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/expect-ct-response-header-inspector-e3970369/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from site.intel.rallylive.ca](https://www.zero.xyz/host/site.intel.rallylive.ca/llms.txt)