# nichedata.dev

> Pay-per-call niche demand and competition intelligence for Kindle Direct Publishing authors and AI agents. Gated by the x402 micropayment protocol — no API keys, no signup. $0.03 USDC per cached query, $0.10 for live on-demand research, settled in USDC on Base.

## Endpoints

- [Service overview](https://nichedata.dev/): Pricing and quick-start
- [OpenAPI 3.1 spec](https://nichedata.dev/openapi.json): Machine-readable API definition
- [x402 manifest](https://nichedata.dev/.well-known/x402): x402 payment discovery
- [MCP server](https://nichedata.dev/mcp): Streamable-HTTP MCP endpoint with `list_niches` and `research_niche` tools
- [Browse cached niches](https://nichedata.dev/v1/niches): Free list of pre-seeded keywords
- [Health](https://nichedata.dev/v1/health): Service status

## Optional

- [Interactive docs](https://nichedata.dev/docs): Swagger UI
- [ReDoc](https://nichedata.dev/redoc): Alternative documentation
- [Sitemap](https://nichedata.dev/sitemap.xml): Crawlable URL list