Scientific paper lookup by DOI, arXiv id or PMID
Scientific paper lookup by DOI, arXiv id or PMID: full abstract, Semantic Scholar TLDR, ready-to-paste BibTeX and APA citations, citation counts, retraction flag, paper type, open-access PDF link. Merged from OpenAlex, Crossref, arXiv, PubMed and Semantic Scholar. Use to cite a known paper or expand a search hit.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
623 msmedian answer time
$0.005listed price per call
$0.005price 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/paper
| 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 | $0.005 | 623 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"id": "10.48550/arxiv.1706.03762"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"doi": {
"description": "Alias of id",
"type": "string"
},
"id": {
"description": "id from /search: a DOI, arxiv:<id> or pmid:<id>",
"type": "string"
}
},
"required": [
"id"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"abstract": {
"description": "Empty if no source has one",
"type": "string"
},
"authors": {
"items": {
"type": "string"
},
"type": "array"
},
"citation": {
"properties": {
"apa": {
"description": "APA 7",
"type": "string"
},
"bibtex": {
"type": "string"
}
},
"required": [
"bibtex",
"apa"
],
"type": "object"
},
"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"
]
},
"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"
},
"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"
},
"note": {
"description": "Present only when no source matched",
"type": "string"
},
"oa_status": {
"enum": [
"gold",
"green",
"hybrid",
"bronze",
"closed",
"unknown"
],
"type": "string"
},
"pdfUrl": {
"description": "Only when the full text is really open",
"type": [
"string",
"null"
]
},
"title": {
"type": "string"
},
"tldr": {
"description": "Semantic Scholar TLDR; empty if unavailable",
"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"
}
},
"required": [
"id",
"title",
"authors",
"year",
"venue",
"abstract",
"tldr",
"doi",
"citationCount",
"citationsPerYear",
"is_retracted",
"type",
"oa_status",
"pdfUrl",
"url",
"citation",
"coverage"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}