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Head to head · Lead enrichment · October 2026 research run

Clearbit vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Clearbit's 13.5 (F), and leads in every scored category. Both do lead enrichment.

Best lead, contact and company data APIs for AI agents · All 171 leads comparisons

ClearbitHubSpot, Inc. · HTTP API F13.5/100#1056 of 1076 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#113 of 1076

Which one, for what

Clearbit F

Best for Only for teams that already hold a Clearbit contract.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

No public API or MCP server an outside agent can call

ZoomInfo API + MCP BB

Best for Sales and marketing agents that need company, contact, intent and business-event data from one vendor, with free search before paid enrichment.

Ahead on

  • Reliability, 87 against 30
  • Schema & documentation, 84 against 0
  • Agent ergonomics, 71 against 0
  • Security & auth, 65 against 8
  • Payments & pricing, 40 against 0
  • Maintenance & community, 76 against 4
  • Transparency & trust, 75 against 66

Also in its favour

  • Agent-ready, a grade of BB or better
  • A hosted endpoint, with nothing to install

Watch for

The Licence Terms and Conditions bar disclosing benchmark results and automated access outside ZoomInfo's own tools without written approval

Score by category

CategoryWeight this runClearbitZoomInfo API + MCPEdge
Reliability16%203087ZoomInfo API + MCP +57
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2084ZoomInfo API + MCP +84
Agent ergonomics13%16.2071ZoomInfo API + MCP +71
Security & auth14%17.5865ZoomInfo API + MCP +57
Payments & pricing10%12.5040ZoomInfo API + MCP +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8476ZoomInfo API + MCP +72
Transparency & trust7%8.86675ZoomInfo API + MCP +9
Negative events≤1500
TotalF 13.5/100BB 72.2/100

Facts side by side

FactClearbitZoomInfo API + MCP
KindHTTP APIHTTP API
VendorHubSpot, Inc.ZoomInfo Technologies LLC
Hosted endpointno (local only)https://api.zoominfo.com/gtm
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth
PricingPaidFreemium
x402nono
LicenceProprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brandProprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT
Tools exposednone26
Read-only variant documentednono
llms.txtnoyes
Last release2025-12-082026-10-02
Terms last updated2025-05-30no date given
Privacy policy last updated2026-08-312025-10-13
Customer content may train modelsyesyes, with an opt-out
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textyes
Popularitynone534 npm/wk

Verdicts

Clearbit

There is no public API or MCP server an outside agent can call today. Clearbit's APIs still run for existing customers behind a login, and its free tools and Logo API were retired in 2025. HubSpot's Breeze Intelligence is the route for new buyers, through HubSpot rather than Clearbit.

ZoomInfo API + MCP

Search, lookup and similar-record calls cost no credits, and a free account with 1,000 data and 1,000 AI credits needs no card. OAuth carries 20 scopes and limits are published per package. The Licence Terms and Conditions bar disclosing benchmark results, and the two documentation sites disagree on batch sizes and rate-limit headers.

Before you call either

Clearbit

  1. Don't plan to call Clearbit. Hand the task to a person with an existing Clearbit account, or use HubSpot's Breeze Intelligence through HubSpot
  2. Replace logo.clearbit.com links, which stopped working after 8 December 2025

ZoomInfo API + MCP

  1. Call Lookup first and pass the returned IDs to Search. Unknown industry, metro or topic strings are rejected with a 422
  2. Search before Enrich. Search is free, and each newly enriched record costs one data credit
  3. Request only the scopes the task needs in the scope parameter of the token call. Omitting it grants every scope configured on the app
  4. On 429 read X-RateLimit-Rejected-Bucket and wait for Retry-After. An exhausted hourly window can mean a wait of several hundred seconds
  5. Turn off model training in the AI client before connecting the MCP server. ZoomInfo prohibits MCP data being used for training

Questions

Which is better for AI agents, Clearbit or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Clearbit's 13.5 (F), and leads in every scored category.

Do Clearbit and ZoomInfo API + MCP need an API key?

Clearbit needs an API key. ZoomInfo API + MCP uses an OAuth sign-in.

Can an agent call Clearbit and ZoomInfo API + MCP without installing anything?

No hosted endpoint is listed for Clearbit. ZoomInfo API + MCP has a hosted endpoint at https://api.zoominfo.com/gtm.

Other comparisons with Clearbit or ZoomInfo API + MCP

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