# DomainSignal

> Sub-30ms domain infrastructure, mailbox diagnostics, and deliverability intelligence API for autonomous AI agents and outbound sales pipelines.

DomainSignal queries Microsoft UserRealm, Google discovery, and Cloudflare DNS-over-HTTPS directly at the edge to provide deterministic, zero-scraping intelligence on corporate domains.

## Core Capabilities
- Mailbox Routing: Identifies Microsoft 365, Google Workspace, and Email Security Gateways (Proofpoint, Mimecast, Barracuda).
- Deliverability Scoring: 0-100 composite score based on RFC 7208 SPF lookup limits, DMARC enforcement, and gateway presence.
- Tech Stack Detection: Decodes DNS SPF records to unmask active CRM and marketing tools (Salesforce, HubSpot, Adobe Marketo, Zendesk, SendGrid).
- Sovereign GovCloud: Identifies Microsoft USGov GCC High and DoD sovereign cloud tenants.
- Tenant GUID: Extracts immutable Microsoft Entra ID directory GUIDs for corporate hierarchy and subsidiary mapping.
- Link Safety & Playbook: Prescriptive guidance on whether to strip hyperlinks to bypass sandbox crawlers.
- Dead Domain Filter: Identifies parked and abandoned domains (GoDaddy, Namecheap, Sedo, Bodis).

## Endpoints
- `GET https://api.domainsignal.io/v1/probe?domain={domain}`: Primary intelligence lookup (requires Bearer token or ?demo=true for testing).
- `POST https://api.domainsignal.io/v1/keys/provision`: Programmatic API key generation (grants 250 free credits).
- `GET https://api.domainsignal.io/openapi.json`: Full OpenAPI 3.0.0 specification for AI Agent tool-calling (OpenAI Actions, LangChain, CrewAI).

## Web Tools
- Domain CSV Enricher: `https://domainsignal.io/split` (Upload lead lists, enrich with live mailbox telemetry, auto-export Google vs. Outlook CSVs, 250 rows free).

## Use Cases Page: https://domainsignal.io/use-cases
Playbooks for provider-matched cold outbound, Proofpoint/Mimecast link-sandboxing defense, USGov GCC High GovCon qualification, zero-scraping CRM/SPF tech-stack discovery, and autonomous AI SDR workflows.

## Pricing
- Starter Pack: $35 for 1,500 credits ($0.023/lookup)
- Growth Pack: $199 for 15,000 credits ($0.013/lookup)
- Scale Pack: $799 for 100,000 credits ($0.008/lookup)
- Custom Enterprise: $0.008/lookup for 100,000+ credits ($800 minimum)
- Credits never expire.

## Contact & Legal
- Operated by Sawtooth Logic Systems LLC
- Support: support@domainsignal.io
- Website: https://domainsignal.io