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Head to head · Lead enrichment · October 2026 research run

Explorium AgentSource vs FullContact

FullContact scores 51.8 (D) on agent readiness against Explorium AgentSource's 48.1 (D), and leads in 4 of 7 scored categories. Explorium AgentSource leads on schema & documentation, payments & pricing and maintenance & community. Both do lead enrichment.

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

Explorium AgentSourceExplorium Ltd. · HTTP API D48.1/100#880 of 1076 FullContactJ2 Martech Corp. (FullContact, a Ziff Davis company) · HTTP API D51.8/100#794 of 1076

Which one, for what

Explorium AgentSource D

Best for Agents that build prospect lists by filter and then enrich them, or that watch companies for events such as funding and role changes.

Ahead on

  • Schema & documentation, 76 against 70
  • Payments & pricing, 40 against 10
  • Maintenance & community, 28 against 20

Watch for

No status page was found, and no SLA is published

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 42
  • Agent ergonomics, 75 against 63
  • Security & auth, 43 against 37

Watch for

No public prices. Access starts with a sales conversation

Score by category

CategoryWeight this runExplorium AgentSourceFullContactEdge
Reliability16%204262FullContact +20
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27670Explorium AgentSource +6
Agent ergonomics13%16.26375FullContact +12
Security & auth14%17.53743FullContact +6
Payments & pricing10%12.54010Explorium AgentSource +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82820Explorium AgentSource +8
Transparency & trust7%8.85961FullContact +2
Negative events≤15-20
TotalD 48.1/100D 51.8/100

Facts side by side

FactExplorium AgentSourceFullContact
KindHTTP APIHTTP API
VendorExplorium Ltd.J2 Martech Corp. (FullContact, a Ziff Davis company)
Hosted endpointhttps://api.explorium.aihttps://api.fullcontact.com/v3
TransportsHTTP, Streamable HTTP, SSE (legacy)HTTP
AuthAPI keyAPI key
PricingPay per usePaid
Price for lead enrichment$0.15 per recordnot published
x402nono
LicenceProprietary service under the Explorium Terms of Use. The mcp-explorium repository of connection files is MITProprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHub
Tools exposed111
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-022026-04-30
Terms last updated2026-06-142025-03-21
Privacy policy last updated2026-06-282026-10-01
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesyes
Terms restrict benchmarkingyesyes
Terms or service can change without noticeyesyes
Arbitration or class-action waivernot found in the textnot found in the text

Verdicts

Explorium AgentSource

AgentSource v2 has a public OpenAPI 3.1 file, Markdown docs, a 200 queries a minute limit with Retry-After, public credit prices and a 100-credit trial. No status page or published SLA was found, each company shares one API key with no scopes, and the vendor's two published price tables disagree.

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.

Before you call either

Explorium AgentSource

  1. Send the key in the api_key header to https://api.explorium.ai and use /v2 paths. v1 is deprecated
  2. Point MCP clients at https://mcp-v2.explorium.ai/mcp. The site's agent files still name the v1 server at mcp.explorium.ai
  3. Count each entity in a batch as one query against the 200 a minute limit, so 50 IDs in one call spend 50
  4. Call the statistics endpoint first to size an audience for free. Fetch costs 1 credit a result, or 2 with the Bombora intent filter
  5. Call /v2/autocomplete before filtering on category, tech stack or job title, and never mix two category types in one request

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

Questions

Which is better for AI agents, Explorium AgentSource or FullContact?

FullContact scores 51.8 (D) on agent readiness against Explorium AgentSource's 48.1 (D), and leads in 4 of 7 scored categories. Explorium AgentSource leads on schema & documentation, payments & pricing and maintenance & community.

Do Explorium AgentSource and FullContact need an API key?

Both need an API key.

Can an agent call Explorium AgentSource and FullContact without installing anything?

Yes. Explorium AgentSource has a hosted endpoint at https://api.explorium.ai and FullContact at https://api.fullcontact.com/v3.

Other comparisons with Explorium AgentSource or FullContact

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