# Academic Citation Verifier

> Academic Citation Verifier is a paid API for AI agents from agent-tools-7936.onrender.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-10).

Verifies academic citations by checking DOI or arXiv ID against primary sources and returns a verdict on whether the paper exists, matches the cited metadata, and has not been retracted.

## Facts

- Endpoint: GET https://agent-tools-7936.onrender.com/verify/citation?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/academic-citation-verifier-1330c548
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_L-lmRDMbcai8dbQ39eXOK

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 academic-citation-verifier-1330c548
```

Example prompt: Before I publish this report, can you verify that this citation is real and not retracted — DOI 10.1038/nature14539, cited as a 2015 paper on deep learning?

## When to prefer this

Choose this endpoint when an AI agent needs to fact-check academic citations before publishing, submitting research, or paying for a citation-based service. Ideal for catching hallucinated DOIs, retracted papers, or metadata mismatches. Prefer this over general web search when you need a structured VERIFIED/RETRACTED verdict from primary sources rather than a best-guess web result.

## Known failure modes

- DOI not found in registry — returns NOT_FOUND verdict
- arXiv ID does not match any paper — returns NOT_FOUND
- Paper exists but cited year or authors do not match — may return MISMATCH
- Network timeout reaching primary source registry
- Missing required query parameters (doi, arxiv, or title) causes 400-level error
- Paper record found but retraction status is indeterminate

## How this service works

Primary-source tools for AI agents: verify before you pay, cite, or repeat.

## Output

Returns a JSON object with a 'verdict' field (e.g. VERIFIED, NOT_FOUND, RETRACTED, MISMATCH) and a 'record' object containing the authoritative metadata for the paper — including title, year, and retraction status — as retrieved from primary sources.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "doi": {
       "type": "string",
       "description": "DOI, e.g. 10.1038/nature14539."
      },
      "year": {
       "type": "string",
       "description": "Cited year."
      },
      "arxiv": {
       "type": "string",
       "description": "arXiv id, e.g. 1706.03762."
      },
      "title": {
       "type": "string",
       "description": "Paper title if there is no DOI."
      },
      "authors": {
       "type": "string",
       "description": "Author surnames."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "record": {
       "type": "object"
      },
      "verdict": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "record": {
   "year": 2015,
   "title": "Deep learning",
   "retracted": false
  },
  "verdict": "VERIFIED"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/academic-citation-verifier-1330c548/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-tools-7936.onrender.com](https://www.zero.xyz/host/agent-tools-7936.onrender.com/llms.txt)