subsets.io

Connect your LLM with the world's statistics

Simple primitives. Thousands of datasets

1
search_datasets// Find relevant statistical data
2
get_dataset_details// Understand data structure
3
execute_sql_query// Extract specific insights
Clone datasets locally. Or query remotely

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Ground your LLM with structured data

Web search scrapes fragments from hundreds of pages with no lineage. Subsets queries authoritative sources directly. Even for World Development Indicators—one of the most common datasets online—LLMs still hallucinate. Over 80% of our warehouse isn't even on the web.

Accuracy on 20 questions

GPT 5.2
Without Subsets
75%
With Subsets
95%
Gemini 3.0 Flash
Without Subsets
75%
With Subsets
95%

Evaluated on World Development Indicators

Even basic facts get hallucinated

"What are the top 3 European countries by GDP per capita in 2022?"

Without Subsets
Luxembourg$126,000
Switzerland$92,000
Norway$89,000
With Subsets
Luxembourg$125,006
Ireland$103,983
Switzerland$92,101

Dataset: wdi_gdp_per_capita

View evaluation source code →

Setup Subsets

Add to your configuration file

macOS:~/Library/Application Support/Claude/claude_desktop_config.json
JSON
{
  "mcpServers": {
    "subsets": {
      "url": "https://mcp.subsets.io/sse"
    }
  }
}

Authentication: Browse and search datasets freely. To run SQL queries, sign in to authenticate your session.

Full documentation →