Marketplace · API · x402

api.kadec0.xyz/v1/papers

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.

Endpoint	`https://api.kadec0.xyz/v1/papers`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~415 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA
method	GET
last updated	2026-11-13T01:15:20.225Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.kadec0.xyz/v1/papers
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-4517c94a3a4340d9

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}

api.kadec0.xyz/v1/papers

Use it

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