Apollo.io uses a credit-based system where each action (email reveal, phone number access, export) consumes credits. Typically, revealing an email costs 1 credit, while phone numbers cost 3-5 credits. Your plan determines your monthly credit allocation, which resets at the beginning of each billing cycle.

Apollo.io maintains GDPR compliance by sourcing data from public sources and providing opt-out mechanisms. However, you as the user are responsible for ensuring your outreach campaigns comply with GDPR, CAN-SPAM, and local regulations. Always include unsubscribe links and honor opt-out requests within 10 business days.

A healthy email deliverability rate is above 95%. Apollo.io provides verified emails with 90-95% accuracy. To maintain high deliverability: warm up new domains, use email verification tools, maintain clean lists, avoid spam triggers, and monitor your sender reputation through tools like Google Postmaster.

Budget 1-2 credits per lead for basic email reveals, 5-7 credits if you need phone numbers. For a campaign targeting 500 leads with email only, allocate 500-1000 credits. Always add a 20% buffer for list verification and duplicate removal.

Yes, Apollo.io provides a robust API for automated lead enrichment and export. You can integrate it with tools like Lemlist, Instantly, or custom scripts. However, respect rate limits (typically 100 requests/minute) and ensure your automation includes proper email verification and compliance checks before sending cold emails.