# AgentRXI Citation Checker

> AgentRXI Citation Checker is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.011/call, status unknown (last checked 2026-10-15).

Verifies whether a cited URL actually supports a given claim, returning a verdict (supported, partial, not supported, or contradicted) with the decisive quote from the source.

## Facts

- Endpoint: GET https://agentrxi.com/v1/citecheck?utm_source=zero.xyz
- Price: $0.011/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-citation-checker-e1086831
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4nq9FBDg6zE9ptaYty-nX

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 agentrxi-citation-checker-e1086831
```

Example prompt: Can you check whether this URL actually supports the claim I'm making? The claim is 'Electric vehicles produce zero direct emissions during operation' and the citation is https://example.com/ev-facts — tell me if it's supported, partially supported, not supported, or contradicted, and show me the quote that decides it.

## When to prefer this

Choose this endpoint when you need to verify that specific URLs actually support specific textual claims — ideal for fact-checking AI-generated content, auditing citations in research or journalism, or validating references before publishing. Prefer it over general web search when you already have the claim and the URL and need a precise verdict with evidence. It handles batch verification of up to 6 claim-URL pairs in one call, making it efficient for document-level citation audits.

## Known failure modes

- URL is inaccessible, paywalled, or returns an error — verdict cannot be determined
- Claim is too vague or ambiguous to evaluate against source content
- Source page has no textual content (e.g. pure image or video page)
- JSON citations parameter is malformed or exceeds 6 items
- Source language differs from claim language, reducing accuracy
- Rate limiting or payment failure blocks the request

## How this service works

Citation checker: for each claim and the URL cited for it, reads the source and says whether it really supports the claim (supported, partial, not supported, contradicted) with the deciding quote. Also callable as GET with the same fields as query parameters.

## Output

For each claim-URL pair, the agent receives a verdict string (supported, partial, not supported, or contradicted), the specific quote from the source page that determined the verdict, and relevant context. Up to 6 citations can be checked in a single call.

## 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": {
      "url": {
       "type": "string"
      },
      "claim": {
       "type": "string"
      },
      "citations": {
       "type": "string",
       "description": "JSON [{claim, url}] up to 6"
      }
     }
    }
   },
   "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/agentrxi-citation-checker-e1086831/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)