# Stupidly Clever

> REST API and MCP server providing 100+ calculators, validators, and data tools for dates, finance, health, global comparisons, and developer utilities.

## API

- Base URL: https://api.stupidlyclever.com/v1/
- MCP endpoint: https://api.stupidlyclever.com/mcp
- OpenAPI spec: https://api.stupidlyclever.com/openapi.json
- Documentation: https://api.stupidlyclever.com/docs
- Authentication: Bearer API key, required for both the REST API and the MCP endpoint. Get a key at https://www.stupidlyclever.com/dashboard
- Pricing: https://www.stupidlyclever.com/pricing

## MCP

The MCP server at https://api.stupidlyclever.com/mcp provides the same tools as the REST API in MCP tool format. Compatible with Claude, OpenAI Responses API, and any MCP-compatible client. Requires a Bearer API key in the Authorization header.

## Example use cases

- "How many business days are there between two dates in Germany?"
- "Validate this phone number and return its E.164 format: +44 7911 123456"
- "What is the income percentile for a salary of $85,000 in Canada?"
- "Calculate the Altman Z-Score for a company with these financials..."
- "Find the top 5 countries with a climate similar to Lisbon"
- "What are the public holidays in Japan in 2027?"
- "Run a mortgage stress test: £400,000 property, £80,000 deposit, 6.5% rate"
- "What is the biological age implied by these health metrics?"
- "Calculate compound interest: $10,000 at 7% for 20 years"
- "Look up the DNS records for example.com"

## Links

- Web calculators (free, no account required): https://www.stupidlyclever.com
- API documentation: https://api.stupidlyclever.com/docs
- Sign up: https://www.stupidlyclever.com/signup
- Support: support@stupidlyclever.com
- Terms: https://www.stupidlyclever.com/terms
- Privacy: https://www.stupidlyclever.com/privacy