Apollo.io — Technical Setup & API Reference

Authentication

Apollo uses API key-based authentication. Retrieve your key from Settings → Integrations → API.

curl -X POST https://api.apollo.io/v1/people/search \
  -H "Content-Type: application/json" \
  -d '{
    "api_key": "YOUR_API_KEY",
    "q_organization_domains": ["apollo.io"],
    "page": 1,
    "per_page": 25
  }'

Key API Endpoints

POST /v1/people/search — Search contacts with filters (title, seniority, location, industry, etc.)
POST /v1/organizations/search — Search company records
POST /v1/people/match — Enrich a contact by email or LinkedIn URL
POST /v1/emailer_campaigns — Create and manage outreach sequences
POST /v1/opportunities — Manage pipeline deals programmatically

CRM Integrations

Apollo natively syncs with Salesforce and HubSpot via OAuth. Configure field mappings, sync frequency, and activity logging under Settings → CRM Integrations. Bidirectional sync ensures contact updates, email events, and call logs flow between systems automatically.

Apollo MCP (Multi-Channel Platform)

The MCP layer orchestrates cross-channel sequences (email, phone, LinkedIn) with rule-based branching logic. Developers can trigger sequence enrollment via API, enabling automated enrollment from external CRM events or webhook payloads.

Webhooks

Subscribe to events (e.g., email.opened, email.replied, meeting.booked) to push real-time data to your own systems or data warehouse via Settings → Webhooks.