ZoomInfo API
ZoomInfo's API is REST and JSON with JWT auth, covering contact and company search, enrichment, intent, scoops, technographics, and bulk operations. Access is no longer strictly contract gated: ZoomInfo documents a free self-serve Builder Portal in GTM AI for users without an active subscription, and the GTM AI pricing page advertises free signup with no credit card plus pay as you go from $20 for API, MCP, and CLI access. Usage remains credit metered with per second rate caps, and high volume production work still runs on paid enterprise terms.
Frequently asked questions
ZoomInfo scores A on Supergood's API Report Card. ZoomInfo's API is REST and JSON with JWT auth, covering contact and company search, enrichment, intent, scoops, technographics, and bulk operations. Access is no longer strictly contract gated: ZoomInfo documents a free self-serve Builder Portal in GTM AI for users without an active subscription, and the GTM AI pricing page advertises free signup with no credit card plus pay as you go from $20 for API, MCP, and CLI access. Usage remains credit metered with per second rate caps, and high volume production work still runs on paid enterprise terms.
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 and company database of hundreds of millions of professionals with intent data, sales engagement (Engage), conversation intelligence (Chorus), workflow automation, and the Go-To-Market Studio.
Revenue teams (sales, marketing, RevOps, recruiting) at mid-market and enterprise B2B companies, weighted toward North American technology, financial services, and professional services buyers. CRM and marketing automation enrichment (Salesforce, HubSpot, Marketo, Dynamics) via native connectors and the API. Prospect list building, ICP targeting, and TAM analysis.
Very high within its niche. ZoomInfo is the default enterprise B2B data provider and the benchmark competitors such as Apollo, Cognism, Lusha, Kaspr, Clearbit/HubSpot Breeze, and LeadIQ are 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 above $100K ACV (Q1 2025). Headquartered in Vancouver, WA; CEO Henry Schuck.
Roots go back to 2007 (DiscoverOrg), with the merged ZoomInfo entity formed in 2019 and an IPO in 2020.
Rate limits and 429 handling require careful exponential backoff, and integrators frequently get retry logic wrong. Enrichment match rates and field coverage vary by entitlement, so gaps surface as silently empty fields rather than explicit errors. Full sourced list under Sources below.
Common alternatives include Apollo.io, Cognism, Lusha, Clearbit (HubSpot Breeze Intelligence), LeadIQ, Kaspr. Graded alternatives appear under "More from the report card" below.
Supergood's grades measure one thing: can a customer's engineering team get their own data out programmatically? Supergood checks six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and rolls them into a letter grade. Supergood re-verifies grades, and they only move on evidence.
ZoomInfo scores GOOD on MCP availability. ZoomInfo maintains an official MCP plugin under its GitHub org that connects clients to its hosted server at mcp.zoominfo.com, with setup instructions for Claude, Codex, and Cursor and OAuth sign-in. The repo shows commits as recent as August 2026 and covers company and contact search, enrichment, and lead scoring.
Yes. ZoomInfo publishes an official MCP server, so MCP clients like Claude, Cursor, and Codex can connect to it directly. Setup instructions are in the vendor's documentation.