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Head to head · Lead enrichment · October 2026 research run

FullContact vs Prospeo API + MCP

FullContact and Prospeo API + MCP score within a point of each other on agent readiness, 51.8 (D) and 50.9 (D). Prospeo API + MCP leads on security & auth, 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 Prospeo API + MCPProspeo · HTTP API D50.9/100#814 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 35
  • Schema & documentation, 70 against 61
  • Transparency & trust, 61 against 42

Watch for

No public prices. Access starts with a sales conversation

Prospeo API + MCP D

Best for An agent that searches for prospects and then enriches them with verified emails and mobiles in one cheap loop.

Ahead on

  • Security & auth, 54 against 43
  • Payments & pricing, 40 against 10
  • Maintenance & community, 34 against 20

Also in its favour

  • Runs on your own machine

Watch for

No status page, SLA or changelog

Score by category

CategoryWeight this runFullContactProspeo API + MCPEdge
Reliability16%206235FullContact +27
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27061FullContact +9
Agent ergonomics13%16.27579Prospeo API + MCP +4
Security & auth14%17.54354Prospeo API + MCP +11
Payments & pricing10%12.51040Prospeo API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82034Prospeo API + MCP +14
Transparency & trust7%8.86142FullContact +19
Negative events≤1500
TotalD 51.8/100D 50.9/100

Facts side by side

FactFullContactProspeo API + MCP
KindHTTP APIHTTP API
VendorJ2 Martech Corp. (FullContact, a Ziff Davis company)Prospeo
Hosted endpointhttps://api.fullcontact.com/v3https://api.prospeo.io
TransportsHTTPHTTP, Streamable HTTP, stdio
AuthAPI keyOAuth or key
PricingPaidFreemium
x402nono
LicenceProprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHubMIT
Tools exposed18
Read-only variant documentednono
llms.txtyesno
MCP registrynot listedio.prospeo/prospeo-mcp-server
Last release2026-04-302026-06-01
Terms last updated2025-03-21couldn't be read
Privacy policy last updated2026-10-01couldn't be read
Customer content may train modelsnot found in the textcouldn't be read
Terms restrict automated accessyescouldn't be read
Terms restrict benchmarkingyescouldn't be read
Terms or service can change without noticeyescouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Popularitynone0 stars, 641 npm/wk
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.

Prospeo API + MCP

MCP tool descriptions say when to use each tool, its credit cost and the next call. No status page, SLA or changelog.

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

Prospeo API + MCP

  1. Call search_suggestions before using location, technology or industry filters, or the search returns nothing
  2. Pass person_id values from search into bulk_enrich_person, 25 at a time
  3. Branch on the body error_code, not the HTTP status, which is 400 for most failures
  4. Set enrich_mobile only when needed. A mobile costs 10 credits against 1 for an email
  5. Use Enrich Person. The old Email Finder endpoint was removed in March 2026

Questions

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

FullContact and Prospeo API + MCP score within a point of each other on agent readiness, 51.8 (D) and 50.9 (D). Prospeo API + MCP leads on security & auth, payments & pricing and maintenance & community.

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

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

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

Yes. FullContact has a hosted endpoint at https://api.fullcontact.com/v3 and Prospeo API + MCP at https://api.prospeo.io.

Other comparisons with FullContact or Prospeo API + MCP

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