# DomainBrief

> On-demand domain lookup with shareable reports and agent-readiness signals.

## API

- Lookup (GET): https://domainbrief.app/api/v1/lookup?domain={domain}
- Lookup (POST): https://domainbrief.app/api/v1/lookup — body: `{ "domain": "example.com" }`

## Discovery

- OpenAPI: https://domainbrief.app/openapi.json
- API catalog (RFC 9727): https://domainbrief.app/.well-known/api-catalog
- MCP server card: https://domainbrief.app/.well-known/mcp/server-card.json
- Agent skills: https://domainbrief.app/.well-known/agent-skills/index.json
- Auth notes: https://domainbrief.app/auth.md
- Agents guide: https://domainbrief.app/AGENTS.md

## Report UI

- Home: https://domainbrief.app/
- Report: https://domainbrief.app/{domain}

## Modules

Full scan modules: domainRating, whois, dns, ssl, http, emailSecurity, tech, network, subdomains, site, llmCrawlability, structuredData, agentProtocols, machineReadability, seoIndexability, performanceHints, hosting, reputation, rdap, tlsPolicy, routing, exposure

Partial scan: add `sections=` query param (comma-separated module names).

## Agent readiness

DomainBrief scans targets for agent protocols, Link headers, Content-Signal in robots.txt, markdown negotiation, LLM crawlability, structured data, machine readability, and DNS-AID HTTPS records with DNSSEC validation.

## Rate limit

1 lookup per 10 seconds per IP. No authentication required.