# CiteGate Citation Check

> CiteGate Citation Check is a paid API for AI agents from mcp-x402.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-26).

Probes whether AI answer engines (e.g. Perplexity, ChatGPT, Gemini) cite a target domain when answering a specific question, returning per-engine CITED / MISSED / BLOCKED verdicts with evidence.

## Facts

- Endpoint: GET https://mcp-x402.onrender.com/gate/squeezeos/citegate/citation-check?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citegate-citation-check-88a7147f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_o5hUfGtWPANvyRlwq8c04

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 citegate-citation-check-88a7147f
```

Example prompt: Check whether AI answer engines are citing 'techcrunch.com' when users ask 'what are the best startup funding strategies' — I want to know if it shows as CITED, MISSED, or BLOCKED for each engine.

## When to prefer this

Choose CiteGate when you need a real, evidence-backed probe of whether a specific domain is being cited by live AI answer engines for a given question — not a simulated or estimated result. It is best suited for SEO professionals, brand managers, and content strategists who need per-engine citation accountability rather than aggregate statistics. Prefer this over generic web monitoring tools when the goal is specifically AI answer engine citation visibility.

## Known failure modes

- Engine surface unavailable — returns BLOCKED rather than a guessed verdict
- Target domain not found in any engine — all engines return MISSED
- Malformed query parameters — missing target or question fields returns an error
- Rate limiting or payment failure — $0.05 USDC charge not processed
- Transient engine unavailability — engine probe times out and may return BLOCKED

## How this service works

CiteGate citation check — best-effort single-shot probe of whether AI answer engines cite a target domain for a question (per-engine CITED / MISSED / BLOCKED with evidence; engines without a public server-rendered answer surface report BLOCKED, never a guessed verdict), $0.05 per accepted check

## Output

A JSON response containing per-engine citation verdicts — each engine returns one of three statuses: CITED (the target domain was found as a source in the answer), MISSED (the engine answered but did not cite the domain), or BLOCKED (the engine has no public server-rendered answer surface and cannot be probed). Evidence snippets or source URLs are included where available.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "target": {
       "type": "string"
      },
      "question": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/citegate-citation-check-88a7147f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-x402.onrender.com](https://www.zero.xyz/host/mcp-x402.onrender.com/llms.txt)