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https://agents.crowdspark.me/v1/research/papersOverview
Free tier: 25 calls/day per IP with header X-Free-Call: 1 (or ?free=1), then pay per call. Scholarly paper search for research agents: keywords or a DOI in, matching papers out with title, authors, year, venue, DOI, citation count, open access PDF or page link, retraction flag and abstract. Filter by year range and open access, sort by relevance, citations or newest. Source OpenAlex, Crossref fallback.
Protocol
x402
Price
$0.0060
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
tools/search
Provider
Agent Tools
Source
self-registered
Indexed
2026-10-29 15:42:43
Health
Status
healthy
Latency (p50)
279ms
Uptime (30d)
100.0%
Reliability Score
90/100
Last Checked
2026-10-31 07:01:51
Last Healthy
2026-10-31 07:01:51
Consecutive Failures
0
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Valid
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Known USDC
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—
Input Schema
{
"method": "GET",
"queryParams": {
"from_year": "2023",
"limit": "3",
"q": "retrieval augmented generation",
"sort": "citations"
},
"type": "http"
}
Output Schema
{
"example": {
"papers": [
{
"abstract": "A short abstract of the paper.",
"authors": [
"A. Author",
"B. Author"
],
"authors_total": 2,
"citations": 181,
"doi": "10.1234/example.5678",
"doi_url": "https://doi.org/10.1234/example.5678",
"open_access": true,
"open_access_url": "https://arxiv.org/pdf/0000.00000",
"retracted": false,
"title": "Example paper on retrieval augmented generation",
"venue": "Example Journal",
"year": 2024
}
],
"returned": 1,
"source": "OpenAlex (CC0)",
"total_matches": 136358
},
"type": "json"
}