Paper Search

Search academic papers across arXiv, Semantic Scholar, and OpenAlex

Available Tools (25)

• search: Deep Research compatible search tool aggregating across sources. — $0.01/call

• fetch: Fetch full document content for a search result. — $0.01/call

• search_arxiv: Search academic papers from arXiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• search_pubmed: Search academic papers from PubMed.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• search_biorxiv: Search academic papers from bioRxiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• search_medrxiv: Search academic papers from medRxiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• search_google_scholar: Search academic papers from Google Scholar.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• search_iacr: Search academic papers from IACR ePrint Archive.

  Args: query: Search query string (e.g., 'cryptography', 'secret sharing'). max_results: Maximum number of papers to return (default: 10). fetch_details: Whether to fetch detailed information for each paper (default: True). Returns: List of paper metadata in dictionary format. — $0.01/call

• download_arxiv: Download PDF of an arXiv paper.

  Args: paper_id: arXiv paper ID (e.g., '2106.12345'). save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call

• download_pubmed: Attempt to download PDF of a PubMed paper.

  Args: paper_id: PubMed ID (PMID). save_path: Directory to save the PDF (default: './downloads'). Returns: str: Message indicating that direct PDF download is not supported. — $0.01/call

• download_biorxiv: Download PDF of a bioRxiv paper.

  Args: paper_id: bioRxiv DOI. save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call

• download_medrxiv: Download PDF of a medRxiv paper.

  Args: paper_id: medRxiv DOI. save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call

• download_iacr: Download PDF of an IACR ePrint paper.

  Args: paper_id: IACR paper ID (e.g., '2009/101'). save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call

• read_arxiv_paper: Read and extract text content from an arXiv paper PDF.

  Args: paper_id: arXiv paper ID (e.g., '2106.12345'). save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call

• read_pubmed_paper: Read and extract text content from a PubMed paper.

  Args: paper_id: PubMed ID (PMID). save_path: Directory where the PDF would be saved (unused). Returns: str: Message indicating that direct paper reading is not supported. — $0.01/call

• read_biorxiv_paper: Read and extract text content from a bioRxiv paper PDF.

  Args: paper_id: bioRxiv DOI. save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call

• read_medrxiv_paper: Read and extract text content from a medRxiv paper PDF.

  Args: paper_id: medRxiv DOI. save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call

• read_iacr_paper: Read and extract text content from an IACR ePrint paper PDF.

  Args: paper_id: IACR paper ID (e.g., '2009/101'). save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call

• search_semantic: Search academic papers from Semantic Scholar.

  Args: query: Search query string (e.g., 'machine learning'). year: Optional year filter (e.g., '2019', '2016-2020', '2010-', '-2015'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call

• download_semantic: Download PDF of a Semantic Scholar paper.

  Args: paper_id: Semantic Scholar paper ID, Paper identifier in one of the following formats: - Semantic Scholar ID (e.g., "649def34f8be52c8b66281af98ae884c09aef38b") - DOI: (e.g., "DOI:10.18653/v1/N18-3011") - ARXIV: (e.g., "ARXIV:2106.15928") - MAG: (e.g., "MAG:112218234") - ACL: (e.g., "ACL:W12-3903") - PMID: (e.g., "PMID:19872477") - PMCID: (e.g., "PMCID:2323736") - URL: (e.g., "URL:https://arxiv.org/abs/2106.15928v1") save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call

• ...and 5 more tools

Quick Start

{
  "mcpServers": {
    "paper-search": {
      "url": "https://paper-search.mcp.xpay.sh/mcp?key=YOUR_XPAY_KEY"
    }
  }
}

Pricing

$0.01 per tool call. Pay per use from your XPay wallet. No subscriptions.

Get an API key at xpay.tools.

Tools: 25 Category: Academic & Research

When to Use

Use Paper Search tools when you need to search academic papers across arxiv, semantic scholar, and openalex. All tools are available through xpay✦'s single MCP connection.

MCP Connection

{
  "mcpServers": {
    "xpay": {
      "url": "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"
    }
  }
}

For Claude Code:

claude mcp add --transport http xpay "https://mcp.xpay.sh/mcp?key=YOUR_API_KEY"

Available Tools

• Search — Deep Research compatible search tool aggregating across sources. — $0.01/call — SKILL.md

• Fetch — Fetch full document content for a search result. — $0.01/call — SKILL.md

• Search Arxiv — Search academic papers from arXiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Search Pubmed — Search academic papers from PubMed.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Search Biorxiv — Search academic papers from bioRxiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Search Medrxiv — Search academic papers from medRxiv.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Search Google Scholar — Search academic papers from Google Scholar.

  Args: query: Search query string (e.g., 'machine learning'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Search Iacr — Search academic papers from IACR ePrint Archive.

  Args: query: Search query string (e.g., 'cryptography', 'secret sharing'). max_results: Maximum number of papers to return (default: 10). fetch_details: Whether to fetch detailed information for each paper (default: True). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Download Arxiv — Download PDF of an arXiv paper.

  Args: paper_id: arXiv paper ID (e.g., '2106.12345'). save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call — SKILL.md

• Download Pubmed — Attempt to download PDF of a PubMed paper.

  Args: paper_id: PubMed ID (PMID). save_path: Directory to save the PDF (default: './downloads'). Returns: str: Message indicating that direct PDF download is not supported. — $0.01/call — SKILL.md

• Download Biorxiv — Download PDF of a bioRxiv paper.

  Args: paper_id: bioRxiv DOI. save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call — SKILL.md

• Download Medrxiv — Download PDF of a medRxiv paper.

  Args: paper_id: medRxiv DOI. save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call — SKILL.md

• Download Iacr — Download PDF of an IACR ePrint paper.

  Args: paper_id: IACR paper ID (e.g., '2009/101'). save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call — SKILL.md

• Read Arxiv Paper — Read and extract text content from an arXiv paper PDF.

  Args: paper_id: arXiv paper ID (e.g., '2106.12345'). save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call — SKILL.md

• Read Pubmed Paper — Read and extract text content from a PubMed paper.

  Args: paper_id: PubMed ID (PMID). save_path: Directory where the PDF would be saved (unused). Returns: str: Message indicating that direct paper reading is not supported. — $0.01/call — SKILL.md

• Read Biorxiv Paper — Read and extract text content from a bioRxiv paper PDF.

  Args: paper_id: bioRxiv DOI. save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call — SKILL.md

• Read Medrxiv Paper — Read and extract text content from a medRxiv paper PDF.

  Args: paper_id: medRxiv DOI. save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call — SKILL.md

• Read Iacr Paper — Read and extract text content from an IACR ePrint paper PDF.

  Args: paper_id: IACR paper ID (e.g., '2009/101'). save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call — SKILL.md

• Search Semantic — Search academic papers from Semantic Scholar.

  Args: query: Search query string (e.g., 'machine learning'). year: Optional year filter (e.g., '2019', '2016-2020', '2010-', '-2015'). max_results: Maximum number of papers to return (default: 10). Returns: List of paper metadata in dictionary format. — $0.01/call — SKILL.md

• Download Semantic — Download PDF of a Semantic Scholar paper.

  Args: paper_id: Semantic Scholar paper ID, Paper identifier in one of the following formats: - Semantic Scholar ID (e.g., "649def34f8be52c8b66281af98ae884c09aef38b") - DOI: (e.g., "DOI:10.18653/v1/N18-3011") - ARXIV: (e.g., "ARXIV:2106.15928") - MAG: (e.g., "MAG:112218234") - ACL: (e.g., "ACL:W12-3903") - PMID: (e.g., "PMID:19872477") - PMCID: (e.g., "PMCID:2323736") - URL: (e.g., "URL:https://arxiv.org/abs/2106.15928v1") save_path: Directory to save the PDF (default: './downloads'). Returns: Path to the downloaded PDF file. — $0.01/call — SKILL.md

• Read Semantic Paper — Read and extract text content from a Semantic Scholar paper.

  Args: paper_id: Semantic Scholar paper ID, Paper identifier in one of the following formats: - Semantic Scholar ID (e.g., "649def34f8be52c8b66281af98ae884c09aef38b") - DOI: (e.g., "DOI:10.18653/v1/N18-3011") - ARXIV: (e.g., "ARXIV:2106.15928") - MAG: (e.g., "MAG:112218234") - ACL: (e.g., "ACL:W12-3903") - PMID: (e.g., "PMID:19872477") - PMCID: (e.g., "PMCID:2323736") - URL: (e.g., "URL:https://arxiv.org/abs/2106.15928v1") save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: The extracted text content of the paper. — $0.01/call — SKILL.md

• Search Crossref — Search academic papers from CrossRef database.

  CrossRef is a scholarly infrastructure organization that provides persistent identifiers (DOIs) for scholarly content and metadata. It's one of the largest citation databases covering millions of academic papers, journals, books, and other scholarly content.

  Args: query: Search query string (e.g., 'machine learning', 'climate change'). max_results: Maximum number of papers to return (default: 10, max: 1000). **kwargs: Additional search parameters: - filter: CrossRef filter string (e.g., 'has-full-text:true,from-pub-date:2020') - sort: Sort field ('relevance', 'published', 'updated', 'deposited', etc.) - order: Sort order ('asc' or 'desc') Returns: List of paper metadata in dictionary format.

  Examples: # Basic search search_crossref("deep learning", 20)

    # Search with filters
    search_crossref("climate change", 10, filter="from-pub-date:2020,has-full-text:true")
    
    # Search sorted by publication date
    search_crossref("neural networks", 15, sort="published", order="desc")
  

  — $0.01/call — SKILL.md

• Get Crossref Paper By Doi — Get a specific paper from CrossRef by its DOI.

  Args: doi: Digital Object Identifier (e.g., '10.1038/nature12373'). Returns: Paper metadata in dictionary format, or empty dict if not found.

  Example: get_crossref_paper_by_doi("10.1038/nature12373") — $0.01/call — SKILL.md

• Download Crossref — Attempt to download PDF of a CrossRef paper.

  Args: paper_id: CrossRef DOI (e.g., '10.1038/nature12373'). save_path: Directory to save the PDF (default: './downloads'). Returns: str: Message indicating that direct PDF download is not supported.

  Note: CrossRef is a citation database and doesn't provide direct PDF downloads. Use the DOI to access the paper through the publisher's website. — $0.01/call — SKILL.md

• Read Crossref Paper — Attempt to read and extract text content from a CrossRef paper.

  Args: paper_id: CrossRef DOI (e.g., '10.1038/nature12373'). save_path: Directory where the PDF is/will be saved (default: './downloads'). Returns: str: Message indicating that direct paper reading is not supported.

  Note: CrossRef is a citation database and doesn't provide direct paper content. Use the DOI to access the paper through the publisher's website. — $0.01/call — SKILL.md

How to Execute

1. xpay_discover — Search for tools: xpay_discover("paper-search")
2. xpay_details — Get input schema: xpay_details("paper-search/TOOL_NAME")
3. xpay_run — Execute: xpay_run("paper-search/TOOL_NAME", { ...inputs })
4. xpay_balance — Check credits

Links

• Provider page: https://xpay.tools/paper-search/
• All providers: https://xpay.tools/explore
• Docs: https://docs.xpay.sh