# PixelCove Citation Tracker

> PixelCove Citation Tracker is a paid API for AI agents from citation-tracker.pixelcove.co, paid per call via x402, $0.75/call, status unknown (last checked 2026-09-14).

Checks whether AI assistants (Perplexity, ChatGPT, Claude, Gemini) cite a specified domain when answering a given prompt

## Facts

- Endpoint: POST https://citation-tracker.pixelcove.co/v1/check
- Price: $0.75/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pixelcove-citation-tracker-003cef13
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DmMSTO3YIfCkTFlRk53FO

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 pixelcove-citation-tracker-003cef13 -d '<json body>'
```

Example prompt: Check whether Perplexity and ChatGPT cite mybrand.com when someone asks 'what are the best project management tools for remote teams?' — I want to know if either engine mentions my domain.

## When to prefer this

Use this endpoint when you need to verify whether specific domains are being cited by major AI assistants in response to a given query — ideal for SEO professionals, brand managers, PR teams, and content marketers tracking their AI search visibility. Prefer this over manual testing when you want programmatic, multi-engine citation checks in a single call with structured output.

## Known failure modes

- Engine unavailable or rate-limited — returns error field on that result with null cited value
- Invalid engine name in engines array — likely validation error or failed result
- Prompt exceeds 4000 characters — request rejected
- More than 10 target domains specified — request rejected
- Network timeout to upstream AI engine — captured in error field with latency recorded
- Payment not received or insufficient — x402 payment required response before processing

## How this service works

An MCP server that checks whether Perplexity, ChatGPT, Claude, and Gemini cite your domain when they answer a prompt. One free Perplexity check a day, then $0.20 to $0.75 per call.

## Output

Returns an array of per-engine results, each containing: whether the target domain was cited (boolean), how many times it appeared, a list of cited domains, the model used, response latency in ms, any error messages, and related questions surfaced by the AI. Also includes aggregate succeeded/failed counts across engines.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "prompt",
  "engines",
  "targets"
 ],
 "properties": {
  "prompt": {
   "type": "string",
   "description": "The prompt to send to the search assistant(s), verbatim. 1 to 4000 characters."
  },
  "engines": {
   "type": "array",
   "description": "1 to 4 distinct engines to check, from perplexity, openai, anthropic, gemini."
  },
  "targets": {
   "type": "array",
   "description": "1 to 10 target domains to check for a citation."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "results",
  "succeeded",
  "failed"
 ],
 "properties": {
  "failed": {
   "type": "number"
  },
  "results": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "engine",
     "model",
     "cited",
     "count",
     "domains",
     "latency_ms",
     "error",
     "related_questions"
    ],
    "properties": {
     "cited": {
      "type": [
       "boolean",
       "null"
      ]
     },
     "count": {
      "type": "number"
     },
     "error": {
      "type": [
       "string",
       "null"
      ]
     },
     "model": {
      "type": [
       "string",
       "null"
      ]
     },
     "engine": {
      "type": "string"
     },
     "domains": {
      "type": "array",
      "items": {
       "type": "string"
      }
     },
     "latency_ms": {
      "type": "number"
     },
     "related_questions": {
      "type": "array",
      "items": {
       "type": "string"
      }
     }
    }
   }
  },
  "succeeded": {
   "type": "number"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pixelcove-citation-tracker-003cef13/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from citation-tracker.pixelcove.co](https://www.zero.xyz/host/citation-tracker.pixelcove.co/llms.txt)