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Swartzpath — Legal Open-Access Paper Resolver
x402
Swartzpath — Legal Open-Access Paper Resolver is a paid API for AI agents from api.robotsshop.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Resolves a paper DOI or title to a legal open-access PDF URL via Unpaywall/OpenAlex, returning nothing for paywalled papers
Price / call$0.01
Success—
StatusUnknown
How this service works
Swartzpath — legal OA path to the paper (Unpaywall/OpenAlex). Not Sci-Hub. Closed stays closed.
Output
Returns the legal open-access PDF URL for the paper if one exists via Unpaywall or OpenAlex repositories; if the paper is paywalled with no legal OA version, the response indicates closed access. Does not return Sci-Hub or piracy links.
Example use cases
Legal PDF for literature review
“I'm doing a literature review and need a free legal PDF for the paper '10.1016/j.cell.2020.02.052' — can you check if there's an open-access version available?”
Check OA availability before purchase
“Before I pay for journal access, can you check if the paper 'Attention is All You Need' by Vaswani et al. has a legal free version I can download?”
Research agent bulk paper access
“I have a list of DOIs from my citation manager — can you find legal open-access PDF links for the paper '10.1126/science.1260419' so I don't have to pay the publisher?”
Technical details
Endpoint
GEThttps://api.robotsshop.io/v0/swartzpathWhen to prefer
Choose this endpoint when you need to find a legally free PDF for a specific academic paper and want to stay within copyright law. Prefer it over general web search when you have a DOI or paper title and need a direct, machine-readable OA URL from authoritative academic open-access databases. Not suitable for paywalled-only papers or gray-market sources.
Side effects
- Paper has no legal open-access version — closed access papers return no URL
- Invalid or malformed DOI results in resolution failure
- Free-text search query is ambiguous and matches wrong paper
- Paper not yet indexed by Unpaywall or OpenAlex
- Rate limiting or upstream provider unavailability
Output
Schema · Response
{
"type": "json",
"example": {
"doi": "10.1038/nature12373",
"grade": "A",
"seller": "RobotsShop",
"pdf_url": "https://example.org/paper.pdf",
"product": "Swartzpath",
"oa_status": "gold"
}
}Tags
x402
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