Api Endpoint

Citations, References, Cited-By

Citation lookup and reference list for a paper. Given a DOI, arXiv id, OpenAlex id, or PMID, returns its references (the works it cites) and its cited-by list (recent works that cite it), plus full metadata and citation count — for bibliography building and citation lookup. Keyless via OpenAlex and Semantic Scholar.

Open interactive test console

Offering

Provider: api.kadec0.xyz
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Science And Education
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://api.kadec0.xyz/v1/paper-details
MIME type: application/json
First seen: 2026-10-16T01:50:10.647Z
Last seen: 2026-11-02T16:48:23.072Z
Tags: citation-lookup, citations, references, cited-by, doi-lookup

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.03 USDC
Atomic price: 30000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "30000",
    "payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA"
  }
]

Observed health

Status: Healthy
Latest latency: 126 ms
Average latency: 399 ms
HTTP status: 402
Last checked: 2026-11-02T16:48:23.066Z
Reachability: 100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "HEAD",
        "DELETE"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "description": "arXiv id, DOI, OpenAlex id, or PMID"
        },
        "doi": {
          "type": "string",
          "description": "alias for id (DOI form)"
        },
        "ref_limit": {
          "type": "string",
          "default": "25",
          "description": "max references (0-100)"
        },
        "cite_limit": {
          "type": "string",
          "default": "25",
          "description": "max citing works (0-100)"
        }
      },
      "required": [],
      "anyOf": [
        {
          "required": [
            "id"
          ]
        },
        {
          "required": [
            "doi"
          ]
        }
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "anyOf": [
            {
              "required": [
                "id"
              ]
            },
            {
              "required": [
                "doi"
              ]
            }
          ],
          "properties": {
            "cite_limit": {
              "default": "25",
              "description": "max citing works (0-100)",
              "type": "string"
            },
            "doi": {
              "description": "alias for id (DOI form)",
              "type": "string"
            },
            "id": {
              "description": "arXiv id, DOI, OpenAlex id, or PMID",
              "type": "string"
            },
            "ref_limit": {
              "default": "25",
              "description": "max references (0-100)",
              "type": "string"
            }
          },
          "required": [],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}