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Head to head · Lead enrichment · October 2026 research run

Clearbit vs FullEnrich API + MCP

FullEnrich API + MCP scores 59.6 (C) on agent readiness against Clearbit's 13.5 (F), and leads in 6 of 7 scored categories. 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#1073 of 1094 FullEnrich API + MCPFullEnrich · HTTP API C59.6/100#577 of 1094

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

FullEnrich API + MCP C

Best for Maximising find rate on known contacts, especially mobiles, without a long-term contract.

Ahead on

  • Reliability, 60 against 30
  • Schema & documentation, 72 against 0
  • Agent ergonomics, 60 against 0
  • Security & auth, 55 against 8
  • Payments & pricing, 40 against 0
  • Maintenance & community, 68 against 4

Also in its favour

  • A hosted endpoint, with nothing to install
  • Free to start without a card

Watch for

Enrichment sources are third-party providers the vendor doesn't name

Score by category

CategoryWeight this runClearbitFullEnrich API + MCPEdge
Reliability16%203060FullEnrich API + MCP +30
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2072FullEnrich API + MCP +72
Agent ergonomics13%16.2060FullEnrich API + MCP +60
Security & auth14%17.5855FullEnrich API + MCP +47
Payments & pricing10%12.5040FullEnrich API + MCP +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8468FullEnrich API + MCP +64
Transparency & trust7%8.86664Clearbit +2
Negative events≤1500
TotalF 13.5/100C 59.6/100

Facts side by side

FactClearbitFullEnrich API + MCP
KindHTTP APIHTTP API
VendorHubSpot, Inc.FullEnrich
Hosted endpointno (local only)https://app.fullenrich.com/api/v2
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingPaidFreemium
x402nono
LicenceProprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brandnone
Tools exposednone13
Read-only variant documentednono
llms.txtnoyes
MCP registrynot listedio.github.FullEnrich/fullenrich
Last release2025-12-082026-08-27
Terms last updated2025-05-302026-08-20
Privacy policy last updated2026-08-312026-08-20
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 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
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.

FullEnrich API + MCP

Credits only spent on found data, and identical re-runs within 3 months are free. Enrichment sources are third-party providers the vendor doesn't name.

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

FullEnrich API + MCP

  1. Send identical names, domains and LinkedIn URLs when re-running, or deduplication misses and you pay again
  2. Expect 30 to 90 seconds a contact. Use the webhook or poll get_enrichment_results
  3. Ask for mobiles only when needed. They cost 10 credits against 1 for a work email
  4. Call list_industries and list_seniorities before filtering search
  5. Use the 0-credit test contacts in the docs to check an integration

Questions

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

FullEnrich API + MCP scores 59.6 (C) on agent readiness against Clearbit's 13.5 (F), and leads in 6 of 7 scored categories.

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

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

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

No hosted endpoint is listed for Clearbit. FullEnrich API + MCP has a hosted endpoint at https://app.fullenrich.com/api/v2.

Other comparisons with Clearbit or FullEnrich API + MCP

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