LeadPost

Turn anonymous traffic into contacts

APICapable readiness

About

What is LeadPost

LeadPost tracks website visitors, resolves their identities, and returns verified contact details — including name, email address, and mailing address — for up to 40% of anonymous traffic, without relying on cookies. It's built for marketing teams and agencies at SMBs and mid-market companies that need to extract more pipeline from existing traffic rather than spend more on acquisition. The standout capability is direct mail retargeting: LeadPost can route identified visitors into physical mail campaigns, a channel most visitor ID tools don't touch. It covers both B2C and B2B audiences and connects natively to HubSpot for CRM handoff. The main limitation is integration depth — HubSpot is the only named native connector, so teams running other CRMs or complex martech stacks will need to lean on the API or manual exports.

Data & Discovery

Capabilities

Key features

Visitor identification

de-anonymises anonymous website traffic

Native CRM integration

first-party connectors, no middleware required

Data

verified emails, visitor identification

Our verdict

Vanderbuild take

For marketing teams and agencies that want to act on traffic they're already paying for, LeadPost is one of the few visitor identification tools that extends retargeting all the way to physical direct mail — not just email and ad audiences. On the agentic readiness front, the API is available and capable enough that you can wrap it into your own MCP layer or orchestration workflow without too much friction, though MCP-native status is unconfirmed. At $249/month for the Basic plan, it's affordable for small teams to test, but lead volume caps mean you'll likely need to upgrade as campaigns scale. The integration story is thin outside HubSpot — if your stack runs on Salesforce, Marketo, or a custom CRM, expect to do more plumbing work than you'd want.

Mateusz Sekta

Founder, vanderbuild

The wedge

Agentic stack profile

API

REST

Programmatic access available.

REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.

API docs →

Agentic readiness

Capable

Solid API access — wraps cleanly for agent use.

Solid REST or SDK access. No MCP server yet, but easy to wrap in custom agent tooling. Most modern SaaS tools land here.

Stack role

Signal source · Enricher

Where 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.

Compare