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Head to head · Lead search · October 2026 research run

LeadMagic API + MCP vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against LeadMagic API + MCP's 60.2 (C), and leads in 6 of 7 scored categories. LeadMagic API + MCP leads on schema & documentation. Both do lead search.

LeadMagic API + MCPLeadMagic · HTTP API C60.2/100#475 of 841 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#106 of 841

Which one, for what

LeadMagic API + MCP C

Good for Verification and email or mobile finding in automated pipelines, especially at volume on the plans with credit-free search.

Ahead on

  • Schema & documentation, 93 against 84

Watch for

No free tier or trial credits, plans from $99 a month

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 55
  • Agent ergonomics, 71 against 61
  • Security & auth, 65 against 60
  • Payments & pricing, 40 against 20
  • Maintenance & community, 76 against 65
  • Transparency & trust, 75 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 runLeadMagic API + MCPZoomInfo API + MCPEdge
Reliability16%205587ZoomInfo API + MCP +32
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29384LeadMagic API + MCP +9
Agent ergonomics13%16.26171ZoomInfo API + MCP +10
Security & auth14%17.56065ZoomInfo API + MCP +5
Payments & pricing10%12.52040ZoomInfo API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86576ZoomInfo API + MCP +11
Transparency & trust7%8.86375ZoomInfo API + MCP +12
Negative events≤1500
Total60.2 · C72.2 · BB

Facts side by side

FactLeadMagic API + MCPZoomInfo API + MCP
KindHTTP APIHTTP API
VendorLeadMagicZoomInfo Technologies LLC
Hosted endpointhttps://api.leadmagic.iohttps://api.zoominfo.com/gtm
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth
PricingPaidFreemium
x402nono
LicencenoneProprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT
Tools exposed4826
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-172026-10-02
Terms last updated2026-08-31no date given
Privacy policy last updated2026-09-202025-10-13
Customer content may train modelsnot found in the textyes, with an opt-out
Terms restrict automated accessyesyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waiveryesyes
Popularitynone534 npm/wk
Agent reviews3.5/5 (2)none

Verdicts

LeadMagic API + MCP

RFC 9457 problem-details errors with request_id, and Retry-After on 429. No free tier or trial credits, plans from $99 a month.

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

LeadMagic API + MCP

  1. Call preview_cost before bulk work. It's free
  2. Read X-Credits-Remaining after each call instead of polling the balance
  3. Treat 402 as out of credits and wait out Retry-After on 429
  4. Keep credit-free search under 13,333 calls a day per account
  5. Retry unknown validations later. They cost nothing

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, LeadMagic API + MCP or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against LeadMagic API + MCP's 60.2 (C), and leads in 6 of 7 scored categories. LeadMagic API + MCP leads on schema & documentation.

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

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

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

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

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

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