# Public technical data explorers

> A network of 5 focused, deterministic tools. Every tool has a human page, a JSON API, an OpenAPI description and an MCP tool that all return the same result (inputs, result, units, assumptions, sources, timestamps).

## Machine interfaces
- Tool catalog (JSON): https://publicdata.usefulweb.site/api/v1/tools
- OpenAPI (all tools): https://publicdata.usefulweb.site/openapi.json
- MCP server (all tools + workflows): https://publicdata.usefulweb.site/mcp
- Pick a tool for a natural-language request: POST https://publicdata.usefulweb.site/api/v1/tools/prompt-to-tool-router/calculate {"request": "..."}

## Tools
- [Energy Grid Explorer](https://energygridexplorer.usefulweb.site/): Generation mix, load, renewable share, cross-border flows and power prices for European grids. API: POST https://publicdata.usefulweb.site/api/v1/tools/energy-grid-explorer/calculate
- [Internet Archive Change Explorer](https://internetarchivechangeexplorer.usefulweb.site/): See how a web page changed in the Wayback Machine: capture timeline plus the changes that matter. API: POST https://publicdata.usefulweb.site/api/v1/tools/internet-archive-change-explorer/calculate
- [Public Spending Explorer](https://publicspendingexplorer.usefulweb.site/): Search government contracts and grants: who pays whom, totals per agency and vendor. API: POST https://publicdata.usefulweb.site/api/v1/tools/public-spending-explorer/calculate
- [Satellite Change Explorer](https://satellitechangeexplorer.usefulweb.site/): Compare NASA satellite images of any place on two dates: true colour, NDVI, night lights. API: POST https://publicdata.usefulweb.site/api/v1/tools/satellite-change-explorer/calculate
- [Software Adoption Explorer](https://softwareadoptionexplorer.usefulweb.site/): Open-source usage signals: weekly downloads, growth and version adoption for npm, PyPI, crates. API: POST https://publicdata.usefulweb.site/api/v1/tools/software-adoption-explorer/calculate

## Workflows