Crossref doi API

One Crossref scholarly work: title, authors, venue, publication date, license and citation count.

Ask your agent

“Call crossref/doi with doi 10.1038/nature14539 and summarize what comes back.”

Works in any MCP client connected to https://data.openkrill.app/mcp. Install in one line.

Path: crossref/doi
MCP tool: call_endpoint
Credits: 1
Cache: 10 min

Parameters

doistring, required	DOI such as 10.1038/nature14539, or a doi.org link

Response

data.resources[] uses the same keys as every other platform: author, engagement, metadata, with Crossref-only fields under extras. A failed upstream call is never billed.

More Crossref tools

Same doi call on other platforms

DataCite

MCP tool call

{
  "name": "call_endpoint",
  "arguments": {
    "path": "crossref/doi",
    "params": {
      "doi": "10.1038/nature14539"
    }
  }
}

curl

curl "https://data.openkrill.app/v1/crossref/doi?doi=10.1038%2Fnature14539" \
  -H "x-api-key: YOUR_API_KEY"

Response

{
  "success": true,
  "platform": "crossref",
  "endpoint": "crossref/doi",
  "data": {
    "resources": [
      { "id": …, "title": …, "text": …, "url": …,
        "author": {…}, "engagement": {…},
        "metadata": {…}, "extras": {…} }
    ]
  },
  "credits_used": 1,
  "cached": false
}