x402 census · api.kadec0.xyz · a19b7f2f4cad · JSON
GET /v1/papers
unprobed
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. Keyle…
Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.kadec0.xyz/v1/papers |
| Method | GET |
| Price | $0.02 USDC = 20000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA |
| Seller | api.kadec0.xyz |
| Catalogs | cdp (row updated 2026-09-30) |
| Listed since (lower bound) | 2026-09-30 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-30 |
| CDP quality counters | 180 calls and 5 unique payers in 30 days, last call 2026-09-29 (catalog-reported, not verified on chain) |
| Category (keyword rule) | research/reports |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | Academic Paper Search · academic-search, paper-search, arxiv-api, pubmed-search, research-paper-api |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 110 |
| Payments | 363 |
| USDC volume | $5.56 |
| Median payment | $0.01 |
| First / last payment | 2026-06-22 / 2026-09-30 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x4df66B6c140778fe0717880A7c6dDE5Ea53AcDeA |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"maxItems": "10",
"q": "transformer attention",
"sort": "citations",
"source": "all"
},
"type": "http"
},
"output": {
"type": "json",
"example_truncated": true,
"chars": 407
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://api.kadec0.xyz/v1/papers' -H 'accept: application/json'
The catalog declares GET. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.
Paid checks (x402, USDC on Base)
GET https://bazaar.agentexchange.work/r/a19b7f2f4cad/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"a19b7f2f4cad"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.
Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on api.kadec0.xyz.