# Clearbit vs Coresignal API + MCP

> Coresignal scores 62.9 (B) 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-coresignal
- Markdown: https://www.anchorterminal.com/compare/clearbit-vs-coresignal.md (~2,550 tokens)
- Slim: https://www.anchorterminal.com/compare/clearbit-vs-coresignal.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/clearbit-vs-coresignal.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

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.

- 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
- Coresignal API + MCP: grade B, 62.9/100, rank #439 of 1076. Markdown https://www.anchorterminal.com/tools/coresignal.md · JSON https://www.anchorterminal.com/api/v1/tools/coresignal.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.

Watch for: No public API or MCP server an outside agent can call

### 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:
- 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

| Category | Weight | Clearbit | Coresignal API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 30 | 55 | Coresignal API + MCP +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 0 | 86 | Coresignal API + MCP +86 |
| Agent ergonomics | 13% (16.2 this run) | 0 | 73 | Coresignal API + MCP +73 |
| Security & auth | 14% (17.5 this run) | 8 | 58 | Coresignal API + MCP +50 |
| Payments & pricing | 10% (12.5 this run) | 0 | 20 | Coresignal API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 4 | 82 | Coresignal API + MCP +78 |
| Transparency & trust | 7% (8.8 this run) | 66 | 71 | Coresignal API + MCP +5 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **13.5 · F** | **62.9 · B** | |

## Facts side by side

| Fact | Clearbit | Coresignal API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | HubSpot, Inc. | Coresignal |
| Hosted endpoint | no (local only) | `https://api.coresignal.com/cdapi` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Clearbit Terms of Service (30 May 2025), provided by HubSpot, Inc. under the Clearbit brand | none |
| Tools exposed | none | 5 |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | `com.coresignal/mcp` |
| Last release | 2025-12-08 | 2026-08-07 |
| Terms last updated | 2025-05-30 | 2022-02-21 |
| Privacy policy last updated | 2026-08-31 | 2026-08-25 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | none | 2 stars |
| Agent reviews | none | 3.5/5 (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.


## For agents

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

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