Scientific and academic paper search
Scientific and academic paper search: research papers and scholarly literature from arXiv, PubMed, OpenAlex, Crossref and Semantic Scholar in one call, deduplicated and retraction-aware. Each hit: DOI, authors, venue, snippet, citation count and citations per year, type, open-access PDF link. Sort by relevance, recency, citations or impact. Keyless. For literature review and citing research.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
629 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://papers.use.x402atlas.com/search
| Category | Search and research |
|---|---|
| Provider host | papers.use.x402atlas.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.01 | 629 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"limit": 10,
"open_access": false,
"query": "transformer attention mechanism",
"sort": "impact",
"source": "all",
"year_from": 2017,
"year_to": 2026
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"limit": {
"default": 20,
"maximum": 50,
"minimum": 1,
"type": "integer"
},
"open_access": {
"default": false,
"description": "true keeps only items with a pdfUrl",
"type": "boolean"
},
"query": {
"description": "Free-text search",
"maxLength": 500,
"type": "string"
},
"sort": {
"default": "relevance",
"description": "impact = citations per year",
"enum": [
"relevance",
"recency",
"citations",
"impact"
],
"type": "string"
},
"source": {
"default": "all",
"enum": [
"all",
"arxiv",
"pubmed",
"openalex",
"crossref",
"semanticscholar"
],
"type": "string"
},
"year_from": {
"maximum": 9999,
"minimum": 1,
"type": "integer"
},
"year_to": {
"maximum": 9999,
"minimum": 1,
"type": "integer"
}
},
"required": [
"query"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"count": {
"type": "integer"
},
"coverage": {
"properties": {
"complete": {
"type": "boolean"
},
"missing": {
"description": "Sources that failed, timed out or were skipped",
"items": {
"type": "string"
},
"type": "array"
},
"retry": {
"description": "true when a requested source failed (not merely skipped)",
"type": "boolean"
}
},
"required": [
"complete",
"missing",
"retry"
],
"type": "object"
},
"items": {
"items": {
"properties": {
"authors": {
"items": {
"type": "string"
},
"type": "array"
},
"citationCount": {
"description": "Max across sources; null when no source reports counts (arXiv/PubMed-only hits)",
"type": [
"integer",
"null"
]
},
"citationsPerYear": {
"description": "citationCount / years since publication; null with citationCount",
"type": [
"number",
"null"
]
},
"detail_url": {
"description": "/paper call for the full record",
"type": "string"
},
"doi": {
"description": "Lowercase, no doi.org prefix; empty if none",
"type": "string"
},
"id": {
"description": "DOI, or arxiv:<id> / pmid:<id> when the paper has no DOI",
"type": "string"
},
"is_retracted": {
"description": "From OpenAlex; false if OpenAlex did not match",
"type": "boolean"
},
"oa_status": {
"enum": [
"gold",
"green",
"hybrid",
"bronze",
"closed",
"unknown"
],
"type": "string"
},
"pdfUrl": {
"description": "Only when the full text is really open",
"type": [
"string",
"null"
]
},
"snippet": {
"description": "First 300 chars of the abstract; empty if none",
"type": "string"
},
"title": {
"type": "string"
},
"type": {
"enum": [
"journal-article",
"preprint",
"review",
"book-chapter",
"other"
],
"type": "string"
},
"url": {
"description": "doi.org, arxiv.org or pubmed landing page",
"type": "string"
},
"venue": {
"description": "Empty if unknown",
"type": "string"
},
"year": {
"description": "0 if unknown",
"type": "integer"
}