x402 census · api.x402node.dev · 834810e3a4ae · JSON
GET /search/academic
live
Search academic papers across 240M+ publications via OpenAlex (free, no API key, no rate-limit issues). Returns papers with title, authors, abstract, year, citation count, DOI, PDF link. Use ?q=YOUR_QUERY and limit=10. Built for research agents and literature review workflows. Accepts payment on Base or Solana — either network works.
Verdict: live. The unpaid GET reached a valid 402. The live amount equals the catalog price.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.x402node.dev/search/academic |
| Method | GET |
| Price | $0.008 USDC = 8000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| payTo | 0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e |
| Seller | api.x402node.dev |
| Catalogs | cdp (row updated 2026-09-26), payai (row updated 2026-07-19) |
| Listed since (lower bound) | 2026-07-19 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-26 |
| CDP quality counters | 2 calls and 2 unique payers in 30 days, last call 2026-09-26 (catalog-reported, not verified on chain) |
| Category (keyword rule) | research/reports |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | none |
Unpaid probe (census of 2026-09-30)
| Field | Value |
|---|---|
| Probed at | 2026-09-30T23:30:38.766Z |
| HEAD | 400 |
| GET | 402 |
| Verdict | live live: valid 402 to an unpaid GET |
| 402 carried in | header |
| x402Version in the 402 | 2 |
| accepts[0] | {"scheme":"exact","network":"eip155:8453","amount":"8000","payTo":"0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":300,"extra":{"name":"USD Coin","version":"2"}} |
| Live amount equals catalog price | yes |
| Live payTo equals catalog payTo | yes |
| extensions.bazaar in the 402 | yes |
| PAYMENT-REQUIRED header | yes |
| WWW-Authenticate offer | none |
| Content type / server / CORS | application/json / n/a / none |
| Latency | 2,082 ms |
| Error | Payment required |
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 | 97 |
| Payments | 385 |
| USDC volume | $4.30 |
| Median payment | $0.005 |
| First / last payment | 2026-06-17 / 2026-09-30 |
| Sampler-shaped share of payments | 99.5% |
| Payers that are not samplers | 2 |
| Source | forensics-2026-09-30 |
| Address | 0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"limit": "string",
"q": "string"
},
"type": "http"
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://api.x402node.dev/search/academic' -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/834810e3a4ae/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"834810e3a4ae"} 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: PayAI listing status · agentic.market (CDP Bazaar front end) · this record as JSON · all resources on api.x402node.dev.