Scholarly search over arXiv, Crossref, and Semantic Scholar. An agent sends a query, pays $0.002 in USDC, and gets a merged, de-duplicated, citation-ranked paper list back in the same response. Citation graphs and paste-ready bibliographies too. No API key, no account, no subscription.
git clone https://github.com/nirholas/x402-research
cd x402-research && npm install
npm run dev| Route | Price | Returns |
|---|---|---|
GET /search | $0.002 | Merged, de-duplicated, citation-ranked papers with authors, venue, DOI, abstract, and citation count, plus a per-source status block |
GET /paper/:id | $0.003 | Full metadata, abstract, TL;DR, open-access PDF link, plus the top citing works and the reference list |
POST /bibliography | $0.005 | Paste-ready BibTeX and/or APA 7 references, one entry per DOI |
GET /, GET /health, GET /.well-known/x402 |
free | Service info, liveness, discovery manifest |
Every paid route returns the purchased artifact in the 200 response body.
The 402 challenge advertises both. Your client picks whichever it can sign.
base-sepolia · base on mainnetsolana · solana-devnet on devnetimport { wrapFetchWithPayment, createSigner } from "x402-fetch";
const signer = await createSigner("base-sepolia", process.env.PRIVATE_KEY!);
const payFetch = wrapFetchWithPayment(fetch, signer);
const res = await payFetch(
"http://localhost:4021/search?q=attention%20is%20all%20you%20need&limit=5"
);
const artifact = await res.json(); // purchased artifact, in-response