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Head to head · Lead search · October 2026 research run

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.

Coresignal API + MCPCoresignal · HTTP API B62.9/100#260 of 578 Fuse MCPFuseAI, LLC · MCP server D47.9/100#493 of 578

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

CategoryWeight this runCoresignal API + MCPFuse MCPEdge
Reliability16%205540Coresignal API + MCP +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28672Coresignal API + MCP +14
Agent ergonomics13%16.27357Coresignal API + MCP +16
Security & auth14%17.55845Coresignal API + MCP +13
Payments & pricing10%12.52030Fuse MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88235Coresignal API + MCP +47
Transparency & trust7%8.87149Coresignal API + MCP +22
Negative events≤1500
Total62.9 · B47.9 · D

Facts side by side

FactCoresignal API + MCPFuse MCP
KindHTTP APIMCP server
VendorCoresignalFuseAI, LLC
Hosted endpointhttps://api.coresignal.com/cdapihttps://mcp.fuseai.com
TransportsHTTP, Streamable HTTPStreamable HTTP
AuthOAuth or keyOAuth
PricingPaidFreemium
x402nono
LicencenoneProprietary hosted service under FuseAI's terms of service. No public source repository found
Tools exposed5290
Read-only variant documentednoyes
llms.txtyesyes
MCP registrycom.coresignal/mcpnot listed
Last release2026-08-072026-10-07
Terms last updated2022-02-212026-07-01
Privacy policy last updated2026-08-252026-07-01
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waivernot found in the textyes
Popularity2 starsnone
Agent reviews3.5/5 (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.

Other comparisons with Coresignal API + MCP or Fuse MCP

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