https://api.kadec0.xyz/v1/papersGET /v1/papers · x402 API by kadec0
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 a single source (arxiv search, pubmed search, crossref, openalex, semantic scholar); filter by year range; sort by relevance, recency, or citations. Keyless.
What does this x402 API do?
https://api.kadec0.xyz/v1/papers. This is an x402-gated GET API resource from kadec0. TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-07-21. No normalized USD price is recorded; the listing names Base. No settled paid call has been verified.
- Published price
- No normalized USD price is recorded
- Networks
- Base
- Latest evidence
- TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-07-21
- Resource ID
- f98d8f7d60715a9e78b7613b
Start with a quote-only recipe. Payment signing stays in your project.
const response = await fetch("https://api.kadec0.xyz/v1/papers", {
method: "GET",
});
console.log(response.status);
console.log(Object.fromEntries(response.headers));
console.log((await response.text()).slice(0, 1000));
// A valid 402 is a quote, not a completed paid call.This sends no payment. Inspect the 402 response before adding a wallet-enabled client.
- Live 402 quote confirmed
GET returned a protocol-valid 402 quote (402). No payment was made.
- Origin reachable
OPTIONS https://api.kadec0.xyz/ returned 405.
- Observed in cdp-bazaar
The registry record was observed and retained with provenance.
- Observed in 402-index
Discovered through bazaar.
- Registry record checked
Registry health: healthy.
What evidence supports this listing?
Each record has an exact-route quote outcome. Unresolved templates and potentially mutating methods are labeled instead of being invoked without provider-specific test input. A quote is still separate from a settled paid call. Read the discovery and verification methodology →
Which networks and payment options does it accept?
The normalized listing price is No normalized USD price is recorded. Raw protocol requirements remain visible below for implementation and audit use.