# CitationCheck HG – Reference Audit API

> CitationCheck HG – Reference Audit API is a paid API for AI agents from microinvestigacion-hg.heroga32881.chatgpt.site, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-12).

Audits up to 10 academic references per batch by comparing DOI, BibTeX, RIS, or CSL-JSON metadata against Crossref and DataCite registries, returning verified field-level discrepancies and canonical metadata.

## Facts

- Endpoint: GET https://microinvestigacion-hg.heroga32881.chatgpt.site/api/research?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citationcheck-hg-reference-audit-api-29aa996f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zm7T91Tuj9oASXJFZ9maB

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 citationcheck-hg-reference-audit-api-29aa996f
```

Example prompt: Can you audit the references I have on inventory management — search for verified scholarly sources and encyclopedia entries on that topic and return the metadata with DOIs and authors?

## When to prefer this

Choose this endpoint when an agent needs to verify the accuracy of academic citations, retrieve canonical metadata for DOIs, or gather verified scholarly references for a research topic — especially when comparing user-supplied reference data against authoritative registries like Crossref and DataCite. Prefer over generic web search when bibliographic precision and provenance tracing matter.

## Known failure modes

- Missing or invalid 'q' parameter returns an error or empty result
- Query shorter than 2 or longer than 160 characters may be rejected
- No matching references found for niche or misspelled topics
- Crossref or DataCite registry unavailable causes partial or empty provider counts
- Unsupported language code for 'lang' parameter may fall back to default or error

## How this service works

Auditá hasta 10 referencias por lote en DOI, BibTeX, RIS o CSL-JSON. Compará campos con Crossref y DataCite, recuperá evidencia y exportá metadatos registrados. Muestras gratuitas y suscripción prepaga.

## Output

Returns a JSON object containing a list of sources matched to the query, each with a URL, kind (e.g. scholarly_reference or encyclopedia), title, authors, DOI, year, and a text extract. Also includes a providerCounts breakdown (e.g. Crossref:5, Wikipedia:3) and a schemaVersion field.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "GET"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Tema de investigación (2–160 caracteres)"
      },
      "lang": {
       "enum": [
        "es",
        "en"
       ],
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": "inventory management",
  "sources": [
   {
    "url": "https://en.wikipedia.org/wiki/Inventory_management",
    "kind": "encyclopedia",
    "title": "Inventory management",
    "extract": "Context excerpt with attribution"
   },
   {
    "doi": "10.20294/jgbt.2023.19.3.25",
    "url": "https://doi.org/10.20294/jgbt.2023.19.3.25",
    "kind": "scholarly_reference",
    "year": 2023,
    "title": "Evaluating Inventory Management Performance as Measured by Inventory Management Efficiency",
    "authors": [
     "IAGBT",
     "Gil-Whan Kim"
    ]
   }
  ],
  "schemaVersion": "2.0",
  "providerCounts": {
   "Crossref": 5,
   "Wikipedia": 3
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/citationcheck-hg-reference-audit-api-29aa996f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from microinvestigacion-hg.heroga32881.chatgpt.site](https://www.zero.xyz/host/microinvestigacion-hg.heroga32881.chatgpt.site/llms.txt)