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GET /v1/count

Citation & reference counts for a DOI

Try it live

10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/opencitations-api

It works. Grab an API key and use it in your project.

Get an API key

Code snippets

curl "https://api.oanor.com/opencitations-api/v1/count" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/opencitations-api/v1/count", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/opencitations-api/v1/count");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/opencitations-api/v1/count",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "doi": "10.1186/1756-8722-6-59",
        "cited_by_count": 208,
        "reference_count": 72
    },
    "meta": {
        "timestamp": "2026-06-01T16:23:08.515Z",
        "request_id": "68c949d8-2bc2-4406-9f74-97d3412cc8d7"
    },
    "status": "ok",
    "message": "Counts retrieved",
    "success": true
}