OpenCitations Meta: Scholarly Work by DOI (Title, Publication Date)

opencitationsmetasparql/work-by-doi

Looks up one scholarly work in OpenCitations Meta by its DOI and returns the work's OpenCitations identifier (an IRI under https://w3id.org/oc/meta/br/), its title and its publication date. Give the DOI in lowercase, for example 10.1038/171737a0. Returns the SPARQL results document with one row per matching work; an empty `bindings` list means OpenCitations Meta does not hold that DOI. The publication date is as precise as the source gives it (a year, a month or a day). OpenCitations data as served by Eden Engine; not an official OpenCitations product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

OpenCitations Meta

Data from OpenCitations Meta (opencitations.net), released under a Creative Commons CC0 Public Domain Waiver (read 2026-10-21). No credit is required; credit offered as a courtesy: OpenCitations. Served by Eden Engine; not an official OpenCitations product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "opencitationsmetasparql/work-by-doi" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "opencitationsmetasparql/work-by-doi" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "opencitationsmetasparql/work-by-doi", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "opencitationsmetasparql/work-by-doi", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 24, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "doi"
  ],
  "properties": {
    "doi": {
      "type": "string",
      "pattern": "^10\\.[0-9]{4,9}/[a-z0-9._;()/:+-]{1,200}$",
      "maxLength": 220,
      "description": "A DOI in lowercase, for example 10.1038/171737a0. OpenCitations stores DOIs in lowercase, so an upper-case DOI matches nothing."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "head",
    "results"
  ],
  "properties": {
    "head": {
      "type": "object",
      "properties": {
        "vars": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "description": "`vars` lists work, title and date.",
      "additionalProperties": true
    },
    "meta": {
      "type": "object",
      "description": "Engine statistics (query time in ms, result size).",
      "additionalProperties": true
    },
    "results": {
      "type": "object",
      "properties": {
        "bindings": {
          "type": "array",
          "items": {
            "type": "object",
            "additionalProperties": true
          },
          "description": "One object per solution, keyed by variable name. Each value is a term object: `type` (uri or literal), `value` and, for typed literals, `datatype`. A variable left unbound by an OPTIONAL is absent from its row. An empty list means no match."
        }
      },
      "additionalProperties": true
    }
  },
  "description": "The SPARQL 1.1 query results document (application/sparql-results+json), passed through as the endpoint sent it.",
  "additionalProperties": true
}