# Macaroon Network Crossref Research Paper Metadata Search

> Macaroon Network Crossref Research Paper Metadata Search is a paid API for AI agents from api.macaroonnetwork.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Search a bounded Crossref snapshot to retrieve DOI metadata, source provenance, and linked-work rights fields for academic research papers.

## Facts

- Endpoint: POST https://api.macaroonnetwork.com/execute/crossref-research-paper-metadata-v1
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/macaroon-network-crossref-research-paper-metadata-search-5e4e5d58
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v1p507EqO5fQDDJvpRVfS

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 macaroon-network-crossref-research-paper-metadata-search-5e4e5d58 -d '<json body>'
```

Example prompt: Search Crossref for research papers about CRISPR gene editing and give me the DOI, authors, journal, and publication date for the top results — I need stable DOI links and source provenance details.

## When to prefer this

Choose this endpoint when you need structured DOI metadata, provenance, and rights fields for academic papers sourced from Crossref, especially when you want stable DOI links without needing abstracts or full text. Prefer it over general web search when you need machine-readable bibliographic data for citation, rights-checking, or research discovery workflows.

## Known failure modes

- Query matches no papers in the bounded snapshot — returns empty results
- Query is too broad and returns truncated or low-relevance results
- DOI metadata is incomplete in the Crossref snapshot for older or obscure papers
- Snapshot may be outdated and not reflect the very latest publications
- Malformed or missing required input body fields return a validation error

## How this service works

Search a bounded Crossref snapshot for research-paper DOI metadata with stable DOI links, source provenance and conservative linked-work rights fields. Returns metadata only and excludes abstracts and full text.

## Output

Returns structured bibliographic metadata for matching research papers from the Crossref snapshot, including stable DOI links, paper title, author list, journal name, publication date, source provenance, and conservative linked-work rights fields. Abstracts and full text are not included.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "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/macaroon-network-crossref-research-paper-metadata-search-5e4e5d58/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.macaroonnetwork.com](https://www.zero.xyz/host/api.macaroonnetwork.com/llms.txt)