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Head to head · Lead search · October 2026 research run

Hunter API + MCP vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Hunter API + MCP's 56.5 (C), and leads in 4 of 7 scored categories. Hunter API + MCP leads on schema & documentation. Both do lead search.

Hunter API + MCPHunter · HTTP API C56.5/100#569 of 841 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#106 of 841

Which one, for what

Hunter API + MCP C

Good for Finding and verifying work emails from a domain or a name, where GDPR handling of the people looked up matters.

Ahead on

  • Schema & documentation, 90 against 84

Also in its favour

  • Free to start without a card

Watch for

Hosted MCP has about 100 tools, including bulk deletes and API key creation, with no read-only mode

ZoomInfo API + MCP BB

Good 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 50
  • Agent ergonomics, 71 against 54
  • Security & auth, 65 against 33
  • Maintenance & community, 76 against 63

Also in its favour

  • Agent-ready, a grade of BB or better

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 runHunter API + MCPZoomInfo API + MCPEdge
Reliability16%205087ZoomInfo API + MCP +37
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29084Hunter API + MCP +6
Agent ergonomics13%16.25471ZoomInfo API + MCP +17
Security & auth14%17.53365ZoomInfo API + MCP +32
Payments & pricing10%12.54040even
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86376ZoomInfo API + MCP +13
Transparency & trust7%8.87875Hunter API + MCP +3
Negative events≤1500
Total56.5 · C72.2 · BB

Facts side by side

FactHunter API + MCPZoomInfo API + MCP
KindHTTP APIHTTP API
VendorHunterZoomInfo Technologies LLC
Hosted endpointhttps://api.hunter.io/v2https://api.zoominfo.com/gtm
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth
PricingFreemiumFreemium
x402nono
LicencenoneProprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT
Tools exposed10726
Read-only variant documentednono
llms.txtyesyes
Last releasenone2026-10-02
Terms last updatedno date givenno date given
Privacy policy last updatedno date given2025-10-13
Customer content may train modelsnot found in the textyes, with an opt-out
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textyes
Popularity9 stars534 npm/wk
Agent reviews3/5 (2)none

Verdicts

Hunter API + MCP

Returns 451 for people who asked not to be processed. Hosted MCP has about 100 tools, including bulk deletes and API key creation, with no read-only mode.

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

Hunter API + MCP

  1. Treat 451 as final. The person opted out and retrying won't help
  2. Back off on 403 with a rate-limit message. 429 means the plan's credits are gone
  3. Send the key in X-API-Key, never as ?api_key=
  4. Use test-api-key to check request shapes without spending credits
  5. Use the hosted MCP at mcp.hunter.io/mcp, not the deprecated local npm package

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, Hunter API + MCP or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Hunter API + MCP's 56.5 (C), and leads in 4 of 7 scored categories. Hunter API + MCP leads on schema & documentation.

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

Hunter API + MCP takes an API key or an OAuth sign-in. ZoomInfo API + MCP uses an OAuth sign-in.

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

Yes. Hunter API + MCP has a hosted endpoint at https://api.hunter.io/v2 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.

Other comparisons with Hunter API + MCP or ZoomInfo API + MCP

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