curl --request GET \
  --url https://api.firecrawl.dev/v2/search/research/papers/{id}/similar \
  --header 'Authorization: Bearer <token>'

{
  "poolSize": 40,
  "results": [
    {
      "abstract": "We present high quality image synthesis results using diffusion probabilistic models...",
      "ids": {
        "arxiv": [
          "2006.11239"
        ]
      },
      "paperId": "482107036680302043",
      "primaryId": "arxiv:2006.11239",
      "score": 0.032119,
      "signals": {
        "articleRank": 0.00031,
        "seedOverlap": 2,
        "semantic": 0.61,
        "structural": 12
      },
      "title": "Denoising Diffusion Probabilistic Models"
    }
  ],
  "success": true,
  "truncated": false
}