# 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 DOIs per batch by comparing metadata against Crossref and DataCite, detecting title mismatches and invalid formats

## Facts

- Endpoint: GET https://microinvestigacion-hg.heroga32881.chatgpt.site/api/audit?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-1bb545bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bHiXGAKXBgFSYOki5v_qz

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-1bb545bd
```

Example prompt: Can you check these DOIs for me — 10.1287/mnsc.2023.03801, 10.1038/s41586-021-03819-2 — and tell me whether Crossref has valid metadata for them and if the titles match what I have?

## When to prefer this

Use this endpoint when you need batch DOI validation against authoritative scholarly metadata registries (Crossref, DataCite) in a single API call, especially when you also want title mismatch detection. Prefer this over manual Crossref lookups when checking 2–10 citations at once, or when building automated bibliography audit pipelines for research agents.

## Known failure modes

- DOI not found in Crossref or DataCite returns status 'not_found'
- Malformed or non-existent DOI format returns status 'invalid_format'
- More than 10 DOIs in a single batch may be rejected or truncated
- Titles array length mismatch with DOIs array causes comparison errors
- Network timeout if upstream Crossref/DataCite APIs are slow
- Payment failure (402) if prepaid credits are exhausted

## 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 array of per-DOI audit results (status: metadata_found, not_found, or invalid_format; provider name; titleMatch boolean or null) plus a summary object with counts for notFound, invalidFormat, metadataFound, and titleMismatches, along with schemaVersion and referencesChecked.

## 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": [
      "dois"
     ],
     "properties": {
      "dois": {
       "type": "string",
       "description": "1–10 comma-separated DOI identifiers"
      },
      "titles": {
       "type": "string",
       "description": "Optional JSON array of provided titles, same length as DOIs"
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "results": [
   {
    "doi": "10.1287/mnsc.2023.03801",
    "status": "metadata_found",
    "provider": "Crossref",
    "titleMatch": null
   }
  ],
  "summary": {
   "notFound": 0,
   "invalidFormat": 0,
   "metadataFound": 1,
   "titleMismatches": 0
  },
  "schemaVersion": "audit-1.0",
  "referencesChecked": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/citationcheck-hg-reference-audit-api-1bb545bd/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)