x402 census · 2s.io · 218b753b4611 · JSON
GET /api/papers/search
unprobed
Unified scientific literature search across arXiv (preprints), PubMed (biomedical), and Semantic Scholar (cross-field, with citation counts). Returns a flat array of papers with stable schema: source, sourceId, doi, title, authors, abstract, year, publishedAt, citationCount, url, pdfUrl. Partial failures surface in the errors array rather than failing the whole call. Optional filters: since (YYYY…
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://2s.io/api/papers/search |
| Method | GET |
| Price | $0.006 USDC = 6000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| payTo | 0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5 |
| Seller | 2s.io |
| Catalogs | cdp (row updated 2026-09-19) |
| Listed since (lower bound) | 2026-09-19 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-19 |
| CDP quality counters | 1 calls and 1 unique payers in 30 days, last call 2026-09-19 (catalog-reported, not verified on chain) |
| Category (keyword rule) | other/unknown |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | 2s · public-records, identifiers, ai-agents, us-gov-data, x402 |
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 | 118 |
| Payments | 833 |
| USDC volume | $6.21 |
| Median payment | $0.0012 |
| First / last payment | 2026-06-12 / 2026-09-30 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x2b6D4988Db4723E6908Db86Ab2b8dFBc51FC32C5 |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"limit": 10,
"q": "example",
"since": "2024-01-01",
"sources": "example"
},
"type": "http"
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://2s.io/api/papers/search' -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/218b753b4611/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"218b753b4611"} 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 2s.io.