FullContact
Know who's there, in real time.
What is FullContact
FullContact connects disparate digital identifiers — emails, cookies, device IDs — into a single person-level record, resolving fragmented data in real time so teams always work from a unified view of each individual. It's built for marketing, RevOps, and account executives across SMB, mid-market, and enterprise, where knowing who is on your site or in your pipeline before a form fill is the difference between a cold outreach and a warm one. The standout capability is identifying unauthenticated website visitors — people who browse without converting — and enriching those anonymous signals into actionable profiles. Integrations with Salesforce, Pardot, Zapier, and CDPs like Segment and Tealium mean enriched data can flow directly into existing workflows. That said, FullContact is not a prospecting database or sequencing tool — if you need to build net-new lists from scratch, you'll need a separate source of record.
Key features
de-anonymises anonymous website traffic
first-party connectors, no middleware required
real-time enrichment, visitor identification
works with major iPaaS platforms
Vanderbuild take
We see FullContact as the identity resolution layer that marketing and RevOps teams reach for when anonymous traffic and fragmented CRM records are costing them pipeline — it sits squarely in the visitor identification and data enrichment subcategory and does that job without trying to be everything else. The MCP server support means this is genuinely agent-callable — if you're building agentic outbound or real-time personalization workflows, FullContact can sit as an enrichment node inside an AI orchestration layer without any custom wrapping. Pricing isn't publicly listed, so budget conversations will happen with their sales team, which adds friction for smaller teams trying to self-serve an evaluation. The honest limitation here is scope: FullContact resolves and enriches identity well, but it doesn't generate net-new prospect lists or run sequences — you'll still need a separate outbound tool in the stack.
Agentic stack profile
MCP serverYesLive MCP server — agents can call this tool directly.
FullContact MCP provides AI tools with access to best-in-class enrichment data. It reuses the existing FullContact API key for authentication.
Open MCP →APIRESTProgrammatic access available.
REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.
API docs →Agentic readinessNativeBuilt for agents from the ground up.
MCP server + agent-friendly API + at least one autonomous workflow out of the box. The bar for 'Native' is high — only a handful of tools currently qualify.
Stack roleSignal source · EnricherWhere this tool slots into an agentic pipeline.
Plays the role of Signal source + Enricher in an agentic pipeline. Use it to surface buying intent — funding, hiring, job changes, web visits; add firmographic, technographic, and signal data to a lead row on the fly.
FullContact alternatives
Tools that solve a similar problem — compared at a glance.
- Best for
- Marketing, RevOps
- Readiness
- Native
- MCP
- Yes
- API
- REST
- Pricing
- Freemium
- Budget
- $$$
- Best for
- SDR / BDR, Marketing
- Readiness
- Capable
- API
- REST
- Pricing
- Freemium
- Budget
- $
- Best for
- SDR / BDR, Founder
- Readiness
- Capable
- API
- REST
Frequently asked questions
Does FullContact have an MCP server?
Yes — FullContact exposes a Model Context Protocol server. FullContact MCP provides AI tools with access to best-in-class enrichment data. It reuses the existing FullContact API key for authentication. See the MCP docs at https://api.fullcontact.com/v3/mcp.
Does FullContact have a public API?
Yes — FullContact ships a REST API. Docs: https://docs.fullcontact.com/.
Who is FullContact best for?
FullContact is built for Marketing, RevOps, Account Executive. Fits SMB (1-50), Mid-market (50-500), Enterprise-sized teams.
How well does FullContact fit an agentic sales stack?
Tier: Native. Has both an MCP server and an agent-friendly API — drops into an agentic stack with minimal glue code.