# Sigildex Documentation

> Quickstart, REST + MCP + CLI reference, and x402 payments setup. Each page has a Markdown mirror at the same path with a `.md` suffix for agent extraction.

Sigildex is a skill discovery API for coding agents. One natural-language query returns ranked, inspectable results from agent-skill SKILL.md repos and other leading sources. No accounts, no API keys, no SDK install required. 50 discovery workflows free per day per IP; pay-per-workflow in USDC on Base via x402 beyond.

## Getting started

- [Quickstart](https://sigildex.ai/docs/quickstart.md): Pick your integration — MCP, REST, or CLI. Same index, same ranking.
- [API Reference](https://sigildex.ai/docs/api.md): REST endpoints, MCP tools, CLI commands, error codes, rate limits.

## Concepts

- [Payments](https://sigildex.ai/docs/payments.md): x402 micropayments setup, network details, headers, troubleshooting.
- [Verification](https://sigildex.ai/docs/identity.md): Stable skill IDs, the content-hash recipe, and the pin / verify trust contract.

## Agent-readable manifests

- [`/llms.txt`](https://sigildex.ai/llms.txt): Single-file overview optimized for LLM extraction.
- [`/openapi.json`](https://sigildex.ai/openapi.json): Full OpenAPI 3.1 specification.
- [`/.well-known/mcp.json`](https://sigildex.ai/.well-known/mcp.json): MCP server discovery descriptor.
- [`/.well-known/x402.json`](https://sigildex.ai/.well-known/x402.json): x402 payment descriptor.
- [`/SKILL.md`](https://sigildex.ai/SKILL.md): Drop into `.claude/skills/` to teach Claude Code about Sigildex.
- [`/CLAUDE.md`](https://sigildex.ai/CLAUDE.md): Project-level Claude integration notes.

## Live status

- [`GET /health`](https://sigildex.ai/health): Liveness, version, default-corpus skill count, freshness signal.