Apollo API

Searches and retrieves contact records from Apollo's proprietary database of 275M+ verified contacts using keyword, company, role, location, and skill-based filtering. The API returns structured contact objects with email addresses, phone numbers, social profiles, and job history enriched through web scraping, data partnerships, and verification workflows. Results are paginated and support bulk export for prospecting workflows.

Enriches company records with detailed firmographic data including employee count, revenue, funding stage, technology stack, industry classification, and organizational hierarchy. The API accepts company domain, LinkedIn URL, or company name and returns standardized company objects with real-time or cached enrichment data sourced from Apollo's 73M+ company database and third-party data integrations.

Validates email addresses for deliverability and correctness using pattern matching, SMTP verification, and bounce prediction models. The API accepts individual emails or bulk lists and returns verification status (valid, invalid, risky, unknown) with confidence scores and bounce risk classification. Verification results are cached to reduce redundant checks and support high-volume validation workflows.

Enriches contact records with detailed professional attributes including current and past employment history, education, social media profiles (LinkedIn, Twitter, GitHub), skills, certifications, and job change events. The API accepts email, phone, or LinkedIn URL and returns a unified contact object with historical employment data sourced from LinkedIn scraping, public records, and Apollo's proprietary data partnerships.

Automates multi-touch outbound campaigns by orchestrating email sends, follow-ups, and task creation across a sequence of steps with conditional logic and delay scheduling. The API accepts a sequence template (email body, subject, delay intervals) and a contact list, then executes the sequence with built-in tracking, bounce handling, and unsubscribe management. Sequences integrate with CRM systems via webhooks and support A/B testing of email variants.

Streams real-time events (email opens, clicks, replies, bounces, job changes) via webhooks to external systems for CRM synchronization and workflow automation. The API supports event filtering, retry logic, and payload transformation to map Apollo events to CRM-specific field schemas. Webhooks enable bidirectional sync where CRM updates trigger Apollo sequence adjustments or contact list modifications.

Imports contact lists from external sources (CSV, JSON, CRM exports) and deduplicates records against Apollo's database and within the imported list using fuzzy matching on email, phone, and name fields. The API returns a deduplicated list with match confidence scores and enrichment recommendations for duplicate records. Imported lists are stored in Apollo for campaign execution and can be segmented for targeted outreach.

Builds account-based marketing (ABM) lists by combining company filtering (industry, size, revenue, technology stack) with contact role filtering (decision-makers, influencers) to identify target accounts and key stakeholders. The API accepts ABM criteria and returns a list of companies with associated contacts, enabling account-level targeting with multi-threaded outreach. Lists can be exported for CRM import or used directly in Apollo sequences.