OutReign developer documentation

OutReign connects B2B lead intelligence and outbound workflows to your own tools. Choose the interface that matches what you are building.

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REST API

Read and manage saved leads, contacts, pipeline deals and activities. Enrich or score a saved lead, or generate an email draft.

• Base URL: https://api.outreign.io/rest-api
• Authentication: an OutReign API key in the X-API-Key header
• Make your first request
• Browse the API reference

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MCP for AI assistants

Connect a compatible assistant to your OutReign account. The assistant can discover tools for leads, sequences, inbox replies, deals, ICP profiles and agent configuration.

• Endpoint: https://api.outreign.io/mcp
• Authentication: sign in and approve access using OAuth
• Connect your assistant
• Read the tool reference

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Webhooks

Receive subscribed events at your own HTTPS endpoint, or use an inbound webhook to bring external events into OutReign.

• Configure outbound events
• Verify signatures and handle retries
• Set up inbound webhooks

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Before you begin

Use an OutReign account with access to the feature you need. API and MCP access is available on paid plans; plan restrictions and usage limits still apply. Never place API keys, OAuth tokens or webhook secrets in public browser code. For product setup rather than developer integration, visit the Help Center. Check API status when troubleshooting availability.