Index onlineMerchant portal
Api Endpoint

scholar-paper

Resolve one research paper and fuse its metadata across OpenAlex, Crossref, Unpaywall and Semantic Scholar into a single cited JSON. Give a doi, arxiv, pmid, pmcid, openalex_id or title and get canonical metadata, authors with ORCID and affiliations, venue, citation counts, an open-access PDF link and a full id crosswalk.

Open interactive test console

Offering

Provider
payai.agentstools.dev
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://payai.agentstools.dev/scholar/paper
MIME type
application/json
First seen
2026-10-16T02:01:31.612Z
Last seen
Tags
scholar, Research, paper, doi, citation, openalex, crossref, unpaywall, semantic-scholar, metadata, open-access, literature

Website

Payment pricing

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

Payment option 1
0.02 USDC
Atomic price: 20000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.02 USDC
Atomic price: 20000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "payTo": "0xF22e558a00D91Ee12A1F50C52186FecB8dDFf493"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "20000",
    "payTo": "AytHnvc6bZx1ALTy7b5Px7hcavoSYszG9aeKvDcZ8R1u"
  }
]

Observed health

Status
Healthy
Latest latency
364 ms
Average latency
6470 ms
HTTP status
402
Last checked
Reachability
90% over 10 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": {
        "doi": {
          "type": "string",
          "description": "DOI, with or without a doi.org prefix"
        },
        "arxiv": {
          "type": "string",
          "description": "arXiv id such as 2401.01234"
        },
        "pmid": {
          "type": "string",
          "description": "PubMed id (digits)"
        },
        "pmcid": {
          "type": "string",
          "description": "PubMed Central id such as PMC1234567"
        },
        "openalex_id": {
          "type": "string",
          "description": "OpenAlex work id such as W2741809807"
        },
        "title": {
          "type": "string",
          "description": "Paper title to resolve by search"
        },
        "id": {
          "type": "string",
          "description": "Any single identifier; its type is auto-detected"
        }
      },
      "required": []
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "input"
  ],
  "properties": {
    "input": {
      "type": "object",
      "required": [
        "type",
        "method"
      ],
      "properties": {
        "type": {
          "type": "string",
          "const": "http"
        },
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "type": "object",
          "required": [],
          "properties": {
            "id": {
              "type": "string",
              "description": "Any single identifier; its type is auto-detected"
            },
            "doi": {
              "type": "string",
              "description": "DOI, with or without a doi.org prefix"
            },
            "pmid": {
              "type": "string",
              "description": "PubMed id (digits)"
            },
            "arxiv": {
              "type": "string",
              "description": "arXiv id such as 2401.01234"
            },
            "pmcid": {
              "type": "string",
              "description": "PubMed Central id such as PMC1234567"
            },
            "title": {
              "type": "string",
              "description": "Paper title to resolve by search"
            },
            "openalex_id": {
              "type": "string",
              "description": "OpenAlex work id such as W2741809807"
            }
          }
        }
      },
      "additionalProperties": false
    },
    "output": {
      "type": "object",
      "required": [
        "type"
      ],
      "properties": {
        "type": {
          "type": "string"
        },
        "example": {
          "type": "object"
        }
      }
    }
  }
}