# Coresignal API + MCP vs Fuse MCP

> Coresignal API + MCP scores 62.9 (B) on agent readiness against Fuse MCP's 47.9 (D), and leads in 6 of 7 scored categories. Fuse MCP leads on payments & pricing. Both do lead search. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/coresignal-vs-fuse-mcp
- Markdown: https://www.anchorterminal.com/compare/coresignal-vs-fuse-mcp.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/coresignal-vs-fuse-mcp.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/coresignal-vs-fuse-mcp.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: 2026-10-08

Coresignal API + MCP scores 62.9 (B) on agent readiness against Fuse MCP's 47.9 (D), and leads in 6 of 7 scored categories. Fuse MCP leads on payments & pricing. Both do lead search.

- Coresignal API + MCP: grade B, 62.9/100, rank #290 of 629. Markdown https://www.anchorterminal.com/tools/coresignal.md · JSON https://www.anchorterminal.com/api/v1/tools/coresignal.json
- Fuse MCP: grade D, 47.9/100, rank #543 of 629. Markdown https://www.anchorterminal.com/tools/fuse-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/fuse-mcp.json

## Which one, for what

### 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 40
- Schema & documentation, 86 against 72
- Agent ergonomics, 73 against 57
- Security & auth, 58 against 45
- Maintenance & community, 82 against 35
- Transparency & trust, 71 against 49

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

### Fuse MCP (D)

Good for: Suited to a salesperson or founder who wants an assistant to build prospect lists, enrich them and run email and LinkedIn outreach inside one Fuse account.

Ahead on:
- Payments & pricing, 30 against 20

Watch for: The only OAuth scope is `mcp:tools`, so a connection can do everything its user can, including sending email and LinkedIn messages


## Score by category

| Category | Weight | Coresignal API + MCP | Fuse MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 40 | Coresignal API + MCP +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 72 | Coresignal API + MCP +14 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 57 | Coresignal API + MCP +16 |
| Security & auth | 14% (17.5 this run) | 58 | 45 | Coresignal API + MCP +13 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | Fuse MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 35 | Coresignal API + MCP +47 |
| Transparency & trust | 7% (8.8 this run) | 71 | 49 | Coresignal API + MCP +22 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.9 · B** | **47.9 · D** | |

## Facts side by side

| Fact | Coresignal API + MCP | Fuse MCP |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Coresignal | FuseAI, LLC |
| Hosted endpoint | `https://api.coresignal.com/cdapi` | `https://mcp.fuseai.com` |
| Transports | HTTP, Streamable HTTP | Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | none | Proprietary hosted service under FuseAI's terms of service. No public source repository found |
| Tools exposed | 5 | 290 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | `com.coresignal/mcp` | not listed |
| Last release | 2026-08-07 | 2026-10-07 |
| Terms last updated | 2022-02-21 | 2026-07-01 |
| Privacy policy last updated | 2026-08-25 | 2026-07-01 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| 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 | yes |
| Popularity | 2 stars | none |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**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.

**Fuse MCP.** The server documents 290 tools with read-only and destructive annotations, OAuth with PKCE and dynamic client registration, and published limits of 60 requests a minute. The single `mcp:tools` scope grants everything the user can do, sends happen at once with no undo, and no status page, changelog or security contact was found.

## Before you call either

### 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

### Fuse MCP

1. Keep the client's approval prompt on for every tool that is not read-only. Sends, CRM pushes and Slack posts run at once with no undo
2. Launch a campaign only on an explicit request. Creating one makes a draft, and `update_campaign_status_tool` starts real outreach
3. Call `get_credits_balance` and `get_credit_prices` first. Every call needs at least 100 credits, and searches cost 2 credits a result
4. Resolve filter values with `lookup_filter_values` or `get_company_search_enums` before `search_people` or `search_companies`
5. Start long work with `deep_research_start`, then poll `deep_research_status`. A tool call has 60 seconds, and runs take 5 to 20 minutes

## Questions

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

Coresignal API + MCP scores 62.9 (B) on agent readiness against Fuse MCP's 47.9 (D), and leads in 6 of 7 scored categories. Fuse MCP leads on payments & pricing.

### Do Coresignal API + MCP and Fuse MCP need an API key?

Coresignal API + MCP takes an API key or an OAuth sign-in. Fuse MCP uses an OAuth sign-in.

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

Yes. Coresignal API + MCP has a hosted endpoint at https://api.coresignal.com/cdapi and Fuse MCP at https://mcp.fuseai.com.


## For agents

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

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