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OpenCitations References Made by a Work (OMID)

opencitationsindexsparql/references-of-work

Lists the works a scholarly work cites in the OpenCitations Index, looked up by its OpenCitations Meta identifier (OMID, the number after https://w3id.org/oc/meta/br/). Each row gives the citation id (an OCI link) and the OMID link of the cited work. Up to 100 rows per call, paged with `offset`. Open citation data published by OpenCitations under CC0; served by Eden Engine and 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 (opencitations.net)

Data from the OpenCitations Index (opencitations.net), published as CC0 open data. No credit is required; credit offered as a courtesy: OpenCitations. Provided as published, with no warranty of accuracy. 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.

Connect once and your AI can find and run this tool, and any other it needs.

Install itCreate an account
agent
// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "opencitationsindexsparql/references-of-work" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "opencitationsindexsparql/references-of-work" })

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

ChargePrice
Per call
$0.0026
Updated
Oct 21, 2026

Input and output schemas

Input schema
input_schema.json
{
  "type": "object",
  "required": [
    "omid",
    "limit"
  ],
  "properties": {
    "omid": {
      "type": "string",
      "pattern": "^[0-9]{1,16}$",
      "description": "OpenCitations Meta bibliographic resource number, digits only: the part after https://w3id.org/oc/meta/br/, for example 0601."
    },
    "limit": {
      "type": "integer",
      "maximum": 100,
      "minimum": 1,
      "description": "Rows to return, 1 to 100."
    },
    "offset": {
      "type": "integer",
      "default": 0,
      "minimum": 0,
      "description": "Rows to skip, for reading further pages. Leave out to start at the first row."
    }
  },
  "additionalProperties": false
}
Output schema
output_schema.json
{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "description": "One result row: each selected variable as a string. A variable the query left unbound is absent.",
        "additionalProperties": true
      },
      "description": "One entry per row; empty when nothing matches."
    }
  },
  "description": "The rows of the result set, in the endpoint's order.",
  "additionalProperties": false
}