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Head to head · Lead enrichment · October 2026 research run

FullContact vs FullEnrich API + MCP

FullEnrich API + MCP scores 59.6 (C) on agent readiness against FullContact's 51.8 (D), and leads in 5 of 7 scored categories. FullContact leads on agent ergonomics. 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 FullEnrich API + MCPFullEnrich · HTTP API C59.6/100#572 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

  • Agent ergonomics, 75 against 60

Watch for

No public prices. Access starts with a sales conversation

FullEnrich API + MCP C

Best for Maximising find rate on known contacts, especially mobiles, without a long-term contract.

Ahead on

  • Security & auth, 55 against 43
  • Payments & pricing, 40 against 10
  • Maintenance & community, 68 against 20

Also in its favour

  • Free to start without a card

Watch for

Enrichment sources are third-party providers the vendor doesn't name

Score by category

CategoryWeight this runFullContactFullEnrich API + MCPEdge
Reliability16%206260FullContact +2
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27072FullEnrich API + MCP +2
Agent ergonomics13%16.27560FullContact +15
Security & auth14%17.54355FullEnrich API + MCP +12
Payments & pricing10%12.51040FullEnrich API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82068FullEnrich API + MCP +48
Transparency & trust7%8.86164FullEnrich API + MCP +3
Negative events≤1500
TotalD 51.8/100C 59.6/100

Facts side by side

FactFullContactFullEnrich API + MCP
KindHTTP APIHTTP API
VendorJ2 Martech Corp. (FullContact, a Ziff Davis company)FullEnrich
Hosted endpointhttps://api.fullcontact.com/v3https://app.fullenrich.com/api/v2
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingPaidFreemium
x402nono
LicenceProprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHubnone
Tools exposed113
Read-only variant documentednono
llms.txtyesyes
MCP registrynot listedio.github.FullEnrich/fullenrich
Last release2026-04-302026-08-27
Terms last updated2025-03-212026-08-20
Privacy policy last updated2026-10-012026-08-20
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingyesyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waivernot found in the textyes
Agent reviewsnone3.5/5 (2)

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.

FullEnrich API + MCP

Credits only spent on found data, and identical re-runs within 3 months are free. Enrichment sources are third-party providers the vendor doesn't name.

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

FullEnrich API + MCP

  1. Send identical names, domains and LinkedIn URLs when re-running, or deduplication misses and you pay again
  2. Expect 30 to 90 seconds a contact. Use the webhook or poll get_enrichment_results
  3. Ask for mobiles only when needed. They cost 10 credits against 1 for a work email
  4. Call list_industries and list_seniorities before filtering search
  5. Use the 0-credit test contacts in the docs to check an integration

Questions

Which is better for AI agents, FullContact or FullEnrich API + MCP?

FullEnrich API + MCP scores 59.6 (C) on agent readiness against FullContact's 51.8 (D), and leads in 5 of 7 scored categories. FullContact leads on agent ergonomics.

Do FullContact and FullEnrich API + MCP need an API key?

FullContact needs an API key. FullEnrich API + MCP takes an API key or an OAuth sign-in.

Can an agent call FullContact and FullEnrich API + MCP without installing anything?

Yes. FullContact has a hosted endpoint at https://api.fullcontact.com/v3 and FullEnrich API + MCP at https://app.fullenrich.com/api/v2.

Other comparisons with FullContact or FullEnrich API + MCP

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