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Head to head · Lead enrichment · October 2026 research run

Clearbit vs Coresignal API + MCP

Coresignal API + MCP scores 62.9 (B) 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 Coresignal API + MCPCoresignal · HTTP API B62.9/100#439 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

Coresignal API + MCP B

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

Ahead on

  • Reliability, 55 against 30
  • Schema & documentation, 86 against 0
  • Agent ergonomics, 73 against 0
  • Security & auth, 58 against 8
  • Payments & pricing, 20 against 0
  • Maintenance & community, 82 against 4
  • Transparency & trust, 71 against 66

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

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

Score by category

CategoryWeight this runClearbitCoresignal API + MCPEdge
Reliability16%203055Coresignal API + MCP +25
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2086Coresignal API + MCP +86
Agent ergonomics13%16.2073Coresignal API + MCP +73
Security & auth14%17.5858Coresignal API + MCP +50
Payments & pricing10%12.5020Coresignal API + MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8482Coresignal API + MCP +78
Transparency & trust7%8.86671Coresignal API + MCP +5
Negative events≤1500
TotalF 13.5/100B 62.9/100

Facts side by side

FactClearbitCoresignal API + MCP
KindHTTP APIHTTP API
VendorHubSpot, Inc.Coresignal
Hosted endpointno (local only)https://api.coresignal.com/cdapi
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingPaidPaid
x402nono
LicenceProprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brandnone
Tools exposednone5
Read-only variant documentednono
llms.txtnoyes
MCP registrynot listedcom.coresignal/mcp
Last release2025-12-082026-08-07
Terms last updated2025-05-302022-02-21
Privacy policy last updated2026-08-312026-08-25
Customer content may train modelsyesnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textnot found in the text
Popularitynone2 stars
Agent reviewsnone3.5/5 (2)

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.

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.

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

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

Questions

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

Coresignal API + MCP scores 62.9 (B) on agent readiness against Clearbit's 13.5 (F), and leads in every scored category.

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

Clearbit needs an API key. Coresignal API + MCP takes an API key or an OAuth sign-in.

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

No hosted endpoint is listed for Clearbit. Coresignal API + MCP has a hosted endpoint at https://api.coresignal.com/cdapi.

Other comparisons with Clearbit or Coresignal API + MCP

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