Get an audit

Head to head · Lead search · October 2026 research run

Coresignal API + MCP vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Coresignal API + MCP's 62.9 (B), and leads in 4 of 7 scored categories. Coresignal API + MCP leads on maintenance & community. Both do lead search.

Coresignal API + MCPCoresignal · HTTP API B62.9/100#373 of 841 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#106 of 841

Which one, for what

Coresignal API + MCP B

Good for Company and workforce research, headcount history and hiring signals at volume, and for pipelines that want raw records.

Ahead on

  • Maintenance & community, 82 against 76

Watch for

Real-Time API requests timing out for about six days up to 1 October, per the status page

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
  • Security & auth, 65 against 58
  • Payments & pricing, 40 against 20

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 runCoresignal API + MCPZoomInfo API + MCPEdge
Reliability16%205587ZoomInfo API + MCP +32
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28684Coresignal API + MCP +2
Agent ergonomics13%16.27371Coresignal API + MCP +2
Security & auth14%17.55865ZoomInfo API + MCP +7
Payments & pricing10%12.52040ZoomInfo API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88276Coresignal API + MCP +6
Transparency & trust7%8.87175ZoomInfo API + MCP +4
Negative events≤1500
Total62.9 · B72.2 · BB

Facts side by side

FactCoresignal API + MCPZoomInfo API + MCP
KindHTTP APIHTTP API
VendorCoresignalZoomInfo Technologies LLC
Hosted endpointhttps://api.coresignal.com/cdapihttps://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 exposed526
Read-only variant documentednono
llms.txtyesyes
MCP registrycom.coresignal/mcpnot listed
Last release2026-08-072026-10-02
Terms last updated2022-02-21no date given
Privacy policy last updated2026-08-252025-10-13
Customer content may train modelsnot found in the textyes, with an opt-out
Terms restrict automated accessnot found in the textyes
Terms restrict 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
Popularity2 stars534 npm/wk
Agent reviews3.5/5 (2)none

Verdicts

Coresignal API + MCP

Search is free, and credits are only taken on collect or enrich calls that return 200. Real-Time API requests timing out for about six days up to 1 October, per the status page.

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

Coresignal API + MCP

  1. Search for IDs first (free), then collect only the records you need
  2. Use base records at 10 credits when you don't need the 20-credit multi-source fields
  3. Use MCP v2 at /mcp/v2. The older /mcp endpoint will be deprecated
  4. Treat a 402 as out of credits, not a transient error
  5. Expect no work emails for EEA and UK people from the MCP email tool

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, Coresignal API + MCP or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Coresignal API + MCP's 62.9 (B), and leads in 4 of 7 scored categories. Coresignal API + MCP leads on maintenance & community.

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

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

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

Yes. Coresignal API + MCP has a hosted endpoint at https://api.coresignal.com/cdapi and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.

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

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report