# Clearbit vs Explorium AgentSource

> Explorium AgentSource scores 48.1 (D) to Clearbit's 13.5 (F) for lead enrichment. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource
- Markdown: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-14

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.

- Clearbit: grade F, 13.5/100, rank #1056 of 1076. Markdown https://www.anchorterminal.com/tools/clearbit.md · JSON https://www.anchorterminal.com/api/v1/tools/clearbit.json
- Explorium AgentSource: grade D, 48.1/100, rank #880 of 1076. Markdown https://www.anchorterminal.com/tools/explorium-agentsource.md · JSON https://www.anchorterminal.com/api/v1/tools/explorium-agentsource.json
- Best lead, contact and company data APIs for AI agents: https://www.anchorterminal.com/best/lead-data/index.md
- All 171 leads comparisons: https://www.anchorterminal.com/compare/lead-data/index.md

## Which one, for what

### Clearbit (F)

Good 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)

Good 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

| Category | Weight | Clearbit | Explorium AgentSource | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 42 | Explorium AgentSource +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 0 | 76 | Explorium AgentSource +76 |
| Agent ergonomics | 13% (16.2 this run) | 0 | 63 | Explorium AgentSource +63 |
| Security & auth | 14% (17.5 this run) | 8 | 37 | Explorium AgentSource +29 |
| Payments & pricing | 10% (12.5 this run) | 0 | 40 | Explorium AgentSource +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 4 | 28 | Explorium AgentSource +24 |
| Transparency & trust | 7% (8.8 this run) | 66 | 59 | Clearbit +7 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **13.5 · F** | **48.1 · D** | |

## Facts side by side

| Fact | Clearbit | Explorium AgentSource |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | HubSpot, Inc. | Explorium Ltd. |
| Hosted endpoint | no (local only) | `https://api.explorium.ai` |
| Transports | HTTP | HTTP, Streamable HTTP, SSE (legacy) |
| Auth | API key | API key |
| Pricing | Paid | Pay per use |
| Price for lead enrichment | not published | $0.15 per record |
| x402 | no | no |
| Licence | Proprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brand | Proprietary service under the Explorium Terms of Use. The `mcp-explorium` repository of connection files is MIT |
| Tools exposed | none | 11 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2025-12-08 | 2026-09-02 |
| Terms last updated | 2025-05-30 | 2026-06-14 |
| Privacy policy last updated | 2026-08-31 | 2026-06-28 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | not 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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource.json, and with the fewest tokens: https://www.anchorterminal.com/compare/clearbit-vs-explorium-agentsource.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "clearbit", "b": "explorium-agentsource"}`. From a terminal: `anchor compare clearbit explorium-agentsource`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/clearbit.json and https://www.anchorterminal.com/api/v1/tools/explorium-agentsource.json

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