# Unpaywall MCP for AI Agents AI Agent Connect

> Unpaywall (Open Access Papers) lets your AI agent find legal, free versions of scholarly research. It checks DOIs against the Unpaywall database to pull full-text PDF links and metadata. Instead of hitting paywalls, your agent finds the actual files hosted on institutional repositories or publisher sites.

## Overview
- **Category:** knowledge-management
- **Price:** Free
- **Endpoint:** https://edge.vinkius.com/vk_preview_FhVinYZ5ipCUoRhSWZX441L0cACxRSjvwvPVvMMz/ai-agent-connect
- **Tags:** open-access, scholarly-articles, academic-research, doi-lookup, pdf-retrieval, research-database

## Description

This Connector connects your AI agent to the Unpaywall database to find legal, open-access versions of scholarly research. You spend half your day hunting for papers that are stuck behind paywalls. You find a DOI, click a link, and get hit with a subscription prompt. This Connector changes that by letting your AI agent do the legwork for you. When you give your agent a DOI, it queries the database to see if a legal, open-access version exists. If it does, your agent pulls the direct PDF link or the repository source for you. It handles the heavy lifting of checking various license types like gold or green open access so you don't have to. You can find this in the Vinkius catalog to get your agent connected to millions of scholarly articles instantly. It turns a manual search process into a single prompt, letting you focus on reading the data instead of hunting for the files.

## Tools

### get_article_oa_status
Retrieve the Open Access status and direct links for a specific DOI. It tells you if a paper is free and where to find it.

## Prompt Examples

**Prompt:** 
```
Is DOI 10.1038/nature12345 free?
```

**Response:** 
```
I checked the Unpaywall database for you. That paper is available via Open Access. You can find the full PDF here: [Link].
```

**Prompt:** 
```
Find me the PDF for 10.1126/science.1234567.
```

**Response:** 
```
I found a legal, open-access version of that paper hosted on a university repository. Here is the direct link to the full text.
```

**Prompt:** 
```
What kind of open access is 10.1016/j.cell.2021.01.001?
```

**Response:** 
```
That DOI isn't currently available as a free Open Access version. It appears to be behind a publisher paywall.
```

## Capabilities

### Check open access status
Your agent tells you if a specific research paper is available for free.

### Get direct PDF links
The agent provides a clickable link to the full-text PDF of a paper.

### Identify license types
It identifies whether a paper is gold, green, or bronze open access.

### Find repository sources
Your agent locates where a paper is hosted, such as a university repository.

### Automate literature searches
It finds accessible versions of multiple cited works in one go.

## Use Cases

### Gathering a thesis bibliography
A student has a list of 50 DOIs and needs to find every available PDF. The agent checks all 50 and provides a list of direct links.

### Data mining for research
A scientist wants to see which papers in a field are gold open access. The agent pulls the license metadata for 1,000 DOIs.

### Quick reference checking
A researcher wants to know if a specific Nature paper is free before they try to find it. The agent confirms the OA status in seconds.

### Automated literature review
An agent builds a bibliography by checking DOIs for cited works in a specific field and pulling the repository links.

## Benefits

- Skip the paywall hunt by checking OA status instantly for any DOI.
- Save hours on literature reviews by finding multiple cited works at once.
- Verify license types like gold or green open access without visiting publisher sites.
- Get direct links to institutional repositories for papers not on the main site.
- Keep your research legal by only accessing verified open-access versions of articles.

## How It Works

The bottom line is that your agent finds the legal PDF links so you don't have to browse multiple sites.

1. Subscribe to this Connector on Vinkius.
2. Enter your email address as required by the Unpaywall API policy.
3. Ask your agent to find a paper using its DOI.

## Frequently Asked Questions

**How does Unpaywall MCP find research papers?**
It queries the Unpaywall database using a DOI to see if a legal, open-access version of the paper exists on the internet.

**Can Unpaywall MCP get me PDFs for free?**
Yes, it provides direct links to full-text PDFs that are hosted on publisher sites or institutional repositories under open-access licenses.

**Does Unpaywall MCP work with any DOI?**
It works with any DOI that is indexed in the Unpaywall database, which covers millions of scholarly articles.

**Can I use Unpaywall MCP for my literature review?**
Yes, it's a great way to automate the discovery of accessible papers when you have a large list of citations to check.

**Is it legal to use Unpaywall MCP?**
Yes, this Connector only finds versions of papers that are already made available for free under legal open-access licenses.

**What types of papers can Unpaywall MCP find?**
It finds various types of open access, including gold, green, and bronze licenses, from a wide range of publishers and repositories.

**How do I check if a specific research paper is available for free?**
Use the `get_article_oa_status` tool with the paper's DOI. Your agent will query the Unpaywall database and return the Open Access status along with direct links to the PDF if available.

**Does this tool provide legal versions of the papers?**
Yes. Unpaywall only indexes legal, author-archived, or publisher-provided Open Access versions of scholarly articles. It does not access pirated content.

**What information is required to use this server?**
You need the DOI (Digital Object Identifier) of the article and a valid email address to authenticate with the Unpaywall API.