ZoomInfo API
ZoomInfo's Enterprise API is REST and JSON with JWT auth, covering contact and company search, enrichment, intent, technographics, and bulk operations. There is no self-serve or free tier: access requires a paid contract, and usage is credit-metered with per-second rate caps.
Frequently asked questions
ZoomInfo scores A on the API Report Card. ZoomInfo's Enterprise API is REST and JSON with JWT auth, covering contact and company search, enrichment, intent, technographics, and bulk operations. There is no self-serve or free tier: access requires a paid contract, and usage is credit-metered with per-second rate caps.
ZoomInfo has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
ZoomInfo (NASDAQ: GTM, formerly ZI) is the dominant B2B go-to-market intelligence platform, combining a contact/company database of hundreds of millions of professionals with intent data, sales engagement (Engage), conversation intelligence (Chorus), workflow automation, and the newly launched Go-To-Market Studio.
Vertical: Enterprise/HR/ERP (sub-vertical: B2B Sales Intelligence & GTM Data). CRM/MAP enrichment (Salesforce, HubSpot, Marketo, Dynamics) via native connectors and the Enterprise API. Prospect list building, ICP targeting, and TAM analysis. Intent data + website visitor identification for ABM.
Very high within its niche, 9/10. ZoomInfo is the default 'enterprise' B2B data provider and is consistently the benchmark every competitor (Apollo, Cognism, Lusha, Kaspr, Clearbit/HubSpot Breeze, LeadIQ) is compared against.
Public company: NASDAQ: GTM (formerly ZI), IPO June 2020. Q3 2025 revenue: $318.0M (+5% YoY); Q2 2025 revenue: $306.7M. 35,000+ customers; 1,868 customers >$100K ACV (Q1 2025, +108 YoY). Headquartered in Vancouver, WA; CEO Henry Schuck (founder of DiscoverOrg).
Roots go back to 2007 (DiscoverOrg) with the merged ZoomInfo entity formed in 2019 and IPO in 2020.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.