# Research Paper Retraction & Correction Check

> Research Paper Retraction & Correction Check is a paid API for AI agents from research-papers.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-27).

Checks whether a research paper (by DOI) has been retracted, corrected, or flagged, using notices from Crossref and Retraction Watch.

## Facts

- Endpoint: GET https://research-papers.x402tookit.com/paper-retraction-check?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/research-paper-retraction-correction-check-20d0acb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DimFgIVX1wEDIYc2xkfrU

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 research-paper-retraction-correction-check-20d0acb1
```

Example prompt: Can you check if the paper with DOI 10.1016/j.cell.2022.04.012 has been retracted or flagged for any corrections or integrity issues?

## When to prefer this

Use this endpoint when you need a definitive, sourced integrity check on a specific paper before citing it, fact-checking a claim, or screening a literature review. Prefer this over manual Crossref or Retraction Watch searches when you need a combined, structured verdict in a single API call. Most useful for agents doing automated citation validation, academic writing assistance, or research integrity workflows.

## Known failure modes

- Invalid or malformed DOI returns an error or null result
- DOI not found in Crossref or Retraction Watch returns a 'not found' or inconclusive verdict
- Degraded mode if one data source (e.g. Retraction Watch) is unavailable — partial results with 'degraded: true'
- Rate limiting or payment failure returns a 402 or 429 error
- Very recent retractions may not yet be indexed, leading to a false-clear result

## How this service works

Has this paper been retracted, corrected or flagged? Notices from Crossref and Retraction Watch for a DOI.

## Output

Returns a structured response including the paper's DOI, a verdict (e.g. retracted, corrected, clear), a plain-language summary, a list of notices (each with type, date, source, and notice DOI), reasons for any flags, the source URL, an 'asOf' timestamp, and a disclaimer. Also indicates if any sources were not checked and whether the result is degraded.

## 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",
     "required": [
      "doi"
     ],
     "properties": {
      "doi": {
       "type": "string",
       "description": "DOI of the paper"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "doi": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "status": {
       "type": [
        "null",
        "string"
       ]
      },
      "notices": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "date": {
          "type": [
           "null",
           "string"
          ]
         },
         "type": {
          "type": [
           "null",
           "string"
          ]
         },
         "label": {
          "type": [
           "null",
           "string"
          ]
         },
         "source": {
          "type": [
           "null",
           "string"
          ]
         },
         "noticeDoi": {
          "type": [
           "null",
           "string"
          ]
         }
        }
       }
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
   
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/research-paper-retraction-correction-check-20d0acb1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from research-papers.x402tookit.com](https://www.zero.xyz/host/research-papers.x402tookit.com/llms.txt)