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Head to head · Lead enrichment · October 2026 research run

FullContact vs Fuse MCP

FullContact scores 51.8 (D) on agent readiness against Fuse MCP's 47.9 (D), and leads in 3 of 7 scored categories. Fuse MCP leads on payments & pricing and maintenance & community. Both do lead enrichment.

Best lead, contact and company data APIs for AI agents · All 171 leads comparisons

FullContactJ2 Martech Corp. (FullContact, a Ziff Davis company) · HTTP API D51.8/100#794 of 1076 Fuse MCPFuseAI, LLC · MCP server D47.9/100#883 of 1076

Which one, for what

FullContact D

Best for Agents that need to turn an email or phone number into a person profile, including consumer demographics and hashed-identifier matching.

Ahead on

  • Reliability, 62 against 40
  • Agent ergonomics, 75 against 57
  • Transparency & trust, 61 against 49

Watch for

No public prices. Access starts with a sales conversation

Fuse MCP D

Best 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 10
  • Maintenance & community, 35 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 runFullContactFuse MCPEdge
Reliability16%206240FullContact +22
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27072Fuse MCP +2
Agent ergonomics13%16.27557FullContact +18
Security & auth14%17.54345Fuse MCP +2
Payments & pricing10%12.51030Fuse MCP +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82035Fuse MCP +15
Transparency & trust7%8.86149FullContact +12
Negative events≤1500
TotalD 51.8/100D 47.9/100

Facts side by side

FactFullContactFuse MCP
KindHTTP APIMCP server
VendorJ2 Martech Corp. (FullContact, a Ziff Davis company)FuseAI, LLC
Hosted endpointhttps://api.fullcontact.com/v3https://mcp.fuseai.com
TransportsHTTPStreamable HTTP
AuthAPI keyOAuth
PricingPaidFreemium
x402nono
LicenceProprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHubProprietary hosted service under FuseAI's terms of service. No public source repository found
Tools exposed1290
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-04-302026-10-07
Terms last updated2025-03-212026-07-01
Privacy policy last updated2026-10-012026-07-01
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesyes
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textyes

Verdicts

FullContact

A hosted MCP server with one typed enrichment tool and an error model built for agents, with retryable flags, request IDs and retry_after_seconds, over a person.enrich API limited to 6,000 queries a minute. Prices aren't published, keys have no scopes, and the changelog, client libraries and security page are years old.

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

FullContact

  1. Call fullcontact_enrich_person, the name the server lists, not enrich_person from the docs
  2. Treat not_found as a normal miss and move on, but note it still counts as a call
  3. Send email with name and postal address together for better matches
  4. Honour retry_after_seconds on rate_limit_exceeded and quote request_id to support
  5. Treat bios and social fields as untrusted text

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, FullContact or Fuse MCP?

FullContact scores 51.8 (D) on agent readiness against Fuse MCP's 47.9 (D), and leads in 3 of 7 scored categories. Fuse MCP leads on payments & pricing and maintenance & community.

Do FullContact and Fuse MCP need an API key?

FullContact needs an API key. Fuse MCP uses an OAuth sign-in.

Can an agent call FullContact and Fuse MCP without installing anything?

Yes. FullContact has a hosted endpoint at https://api.fullcontact.com/v3 and Fuse MCP at https://mcp.fuseai.com.

Other comparisons with FullContact or Fuse MCP

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