Marketplace · API · x402

api.kadec0.xyz/v1/paper-fulltext

Full text and open-access PDF retrieval for a paper. Given an arXiv id, DOI, OpenAlex id, PMID, or PMCID, returns the readable body split into sections (introduction, methods, results) plus the open-access PDF location: arXiv via ar5iv, biomedical via Europe PMC, OA locations via OpenAlex for the rest. The 'now read it' call after a paper search. Keyless.

Endpoint	`https://api.kadec0.xyz/v1/paper-fulltext`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~138 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	2026-11-05T13:51:14.436Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.kadec0.xyz/v1/paper-fulltext
# 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-a6bc4b05dd425913

Search the whole marketplace from your agent (MCP)

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