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Head to head · Lead enrichment · October 2026 research run

Clearbit vs Explorium AgentSource

Explorium AgentSource scores 48.1 (D) on agent readiness against Clearbit's 13.5 (F), and leads in 6 of 7 scored categories. Clearbit leads on transparency & trust. 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 Explorium AgentSourceExplorium Ltd. · HTTP API D48.1/100#880 of 1076

Which one, for what

Clearbit F

Best for Only for teams that already hold a Clearbit contract.

Ahead on

  • Transparency & trust, 66 against 59

Watch for

No public API or MCP server an outside agent can call

Explorium AgentSource D

Best for Agents that build prospect lists by filter and then enrich them, or that watch companies for events such as funding and role changes.

Ahead on

  • Reliability, 42 against 30
  • Schema & documentation, 76 against 0
  • Agent ergonomics, 63 against 0
  • Security & auth, 37 against 8
  • Payments & pricing, 40 against 0
  • Maintenance & community, 28 against 4

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

No status page was found, and no SLA is published

Score by category

CategoryWeight this runClearbitExplorium AgentSourceEdge
Reliability16%203042Explorium AgentSource +12
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2076Explorium AgentSource +76
Agent ergonomics13%16.2063Explorium AgentSource +63
Security & auth14%17.5837Explorium AgentSource +29
Payments & pricing10%12.5040Explorium AgentSource +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8428Explorium AgentSource +24
Transparency & trust7%8.86659Clearbit +7
Negative events≤150-2
TotalF 13.5/100D 48.1/100

Facts side by side

FactClearbitExplorium AgentSource
KindHTTP APIHTTP API
VendorHubSpot, Inc.Explorium Ltd.
Hosted endpointno (local only)https://api.explorium.ai
TransportsHTTPHTTP, Streamable HTTP, SSE (legacy)
AuthAPI keyAPI key
PricingPaidPay per use
Price for lead enrichmentnot published$0.15 per record
x402nono
LicenceProprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brandProprietary service under the Explorium Terms of Use. The mcp-explorium repository of connection files is MIT
Tools exposednone11
Read-only variant documentednono
llms.txtnoyes
Last release2025-12-082026-09-02
Terms last updated2025-05-302026-06-14
Privacy policy last updated2026-08-312026-06-28
Customer content may train modelsyesnot found in the text
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 textyes
Arbitration or class-action waivernot found in the textnot found in the text

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.

Explorium AgentSource

AgentSource v2 has a public OpenAPI 3.1 file, Markdown docs, a 200 queries a minute limit with Retry-After, public credit prices and a 100-credit trial. No status page or published SLA was found, each company shares one API key with no scopes, and the vendor's two published price tables disagree.

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

Explorium AgentSource

  1. Send the key in the api_key header to https://api.explorium.ai and use /v2 paths. v1 is deprecated
  2. Point MCP clients at https://mcp-v2.explorium.ai/mcp. The site's agent files still name the v1 server at mcp.explorium.ai
  3. Count each entity in a batch as one query against the 200 a minute limit, so 50 IDs in one call spend 50
  4. Call the statistics endpoint first to size an audience for free. Fetch costs 1 credit a result, or 2 with the Bombora intent filter
  5. Call /v2/autocomplete before filtering on category, tech stack or job title, and never mix two category types in one request

Questions

Which is better for AI agents, Clearbit or Explorium AgentSource?

Explorium AgentSource scores 48.1 (D) on agent readiness against Clearbit's 13.5 (F), and leads in 6 of 7 scored categories. Clearbit leads on transparency & trust.

Do Clearbit and Explorium AgentSource need an API key?

Both need an API key.

Can an agent call Clearbit and Explorium AgentSource without installing anything?

No hosted endpoint is listed for Clearbit. Explorium AgentSource has a hosted endpoint at https://api.explorium.ai.

Other comparisons with Clearbit or Explorium AgentSource

Machine-readable

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