Marketplace · API · x402

api.kadec0.xyz/v1/paper-details

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.

Endpoint	`https://api.kadec0.xyz/v1/paper-details`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~145 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	2026-11-13T12:37:58.169Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.kadec0.xyz/v1/paper-details
# 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/x402-931d4ed4bb0d7871

Search the whole marketplace from your agent (MCP)

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