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mirrored listing x402 eip155:8453

Academic and scientific paper search API

Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed, OpenAlex, Crossref, and Semantic Scholar in one call, deduplicated into a ranked result set: title, authors, year, venue, abstract, citation count, DOI, and direct PDF link. Query by keyword or restrict to one source; filter by year range; sort by relevance, recency, or citations. Keyless.

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20000 (raw units)
price
181
calls / 30d
4
unique payers
2026-09-18
updated

Provider

api.kadec0.xyz · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "maxItems": "10",
          "q": "transformer attention",
          "sort": "citations",
          "source": "all"
        },
        "type": "http"
      },
      "output": {
        "example": {
          "count": 1,
          "items": [
            {
              "abstract": "The dominant sequence transduction models...",
              "authors": [
                "Ashish Vaswani"
              ],
              "citationCount": 181057,
              "doi": "10.48550/arxiv.1706.03762",
              "pdfUrl": "https://arxiv.org/pdf/1706.03762",
              "source": "openalex",
              "sources": [
                "openalex",
                "semanticscholar"
              ],
              "title": "Attention Is All You Need",
              "type": "paper",
              "url": "https://doi.org/...",
              "venue": "NeurIPS",
              "year": 2017
            }
          ]
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "properties": {
                "maxItems": {
                  "default": "20",
                  "description": "1-50",
                  "type": "string"
                },
                "q": {
                  "description": "search query / keywords",
                  "type": "string"
                },
                "sort": {
                  "default": "relevance",
                  "enum": [
                    "relevance",
                    "recency",
                    "citations"
                  ],
                  "type": "string"
                },
                "source": {
                  "default": "all",
                  "enum": [
                    "all",
                    "arxiv",
                    "pubmed",
                    "openalex",
                    "crossref",
                    "semanticscholar"
                  ],
                  "type": "string"
                },
                "year_from": {
                  "description": "earliest publication year (inclusive)",
                  "type": "string"
                },
                "year_to": {
                  "description": "latest publication year (inclusive)",
                  "type": "string"
                }
              },
              "required": [
                "q"
              ],
              "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"
    }
  }
}

Use it

curl

curl "https://api.kadec0.xyz/v1/papers"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.kadec0.xyz/v1/papers");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://api.kadec0.xyz/v1/papers")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/311.json, and this resource appears in /discovery/resources and /discovery/search.