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The /outputs endpoints expose Hexagraph’s index of scholarly works — including journal articles, preprints, book chapters, and datasets. Each output record carries citation counts, open-access status, source journal details, and a structured author list. Works are identified by the OA:W prefix system.

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List outputs

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search
string
Full-text search query applied against output titles and abstracts. Supports multi-word phrases such as climate change.
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filter
string
Narrow results using colon-separated key-value filters. Supported filter keys:
  • has_doi:true — only return works that have a registered DOI
  • is_oa:true — only return open-access works
  • year:YYYY — restrict results to a specific publication year (e.g. year:2021)
Combine multiple filters with a comma: has_doi:true,is_oa:true.
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page
integer
default:"1"
Page number for paginated results. Starts at 1.
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per_page
integer
default:"25"
Number of results returned per page. Maximum value is 200.
curl "https://hexagraph-core.onrender.com/outputs?search=climate+change&filter=has_doi:true&per_page=3"

[
  {
    "id": "OA:W2107277218",
    "doi": "10.1038/nature11829",
    "title": "Global warming and the disruption of plant–pollinator networks",
    "year": 2013,
    "date": "2013-01-06",
    "citations": 412,
    "source": {
      "name": "Nature"
    },
    "authors": [
      { "name": "David W. Inouye" },
      { "name": "Amy M. McKinney" }
    ]
  },
  {
    "id": "OA:W2342981892",
    "doi": "10.1126/science.1251635",
    "title": "Climate change and the integrity of science",
    "year": 2014,
    "date": "2014-05-07",
    "citations": 289,
    "source": {
      "name": "Science"
    },
    "authors": [
      { "name": "Peter H. Gleick" }
    ]
  },
  {
    "id": "OA:W1983463608",
    "doi": "10.1038/nclimate1690",
    "title": "Climate change impacts on plant phenology in a warming world",
    "year": 2012,
    "date": "2012-09-23",
    "citations": 553,
    "source": {
      "name": "Nature Climate Change"
    },
    "authors": [
      { "name": "Camille Parmesan" },
      { "name": "Gary Yohe" }
    ]
  }
]

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Get a single output

Fetch a specific scholarly work by its OA:W identifier. 
curl "https://hexagraph-core.onrender.com/outputs/OA:W2107277218"

{
  "id": "OA:W2107277218",
  "doi": "10.1038/nature11829",
  "title": "Global warming and the disruption of plant–pollinator networks",
  "year": 2013,
  "date": "2013-01-06",
  "citations": 412,
  "source": {
    "name": "Nature"
  },
  "authors": [
    { "name": "David W. Inouye" },
    { "name": "Amy M. McKinney" }
  ]
}

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Response fields

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id
string
required
Unique identifier for the output. Always prefixed with OA:W (e.g. OA:W2107277218).
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doi
string
The Digital Object Identifier registered for this work (e.g. 10.1038/nature11829). May be null if no DOI is registered.
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title
string
required
Full title of the scholarly work.
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year
integer
Four-digit publication year (e.g. 2013).
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date
string
ISO 8601 publication date string (e.g. "2013-01-06"). More precise than year when available.
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citations
integer
Total number of citations received by this work, as indexed by Hexagraph.
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source
object
The journal, repository, or venue that published this work.
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authors
array
Ordered list of authors credited on this work. Each element is an object with at minimum a name field. See Authors for full author records.