The Companies API

Search and enrich 54 million companies

Data & Discovery

For AI agents

APICapable readiness

About

What is The Companies API

The Companies API lets you query a database of 54 million companies and return over 300 firmographic data points — industry, headcount, employee detection, similar companies, and more — via a REST API with SDK support. It's built for GTM engineers, RevOps teams, and marketing ops at mid-market and enterprise companies who need to enrich records programmatically rather than through a point-and-click interface. The standout capability is the ability to ask AI questions directly on company profiles, which goes beyond standard field lookups and lets you surface contextual intelligence at query time. The tool also supports CRM enrichment and GTM stack integration, making it a reasonable backbone for account-based workflows. That said, this is a developer-first product — teams without engineering resources or API integration experience will find the setup friction real, and there's no meaningful no-code layer to fall back on.

Data & Discovery

Capabilities

Key features

Data enrichment

fills records with firmographic, technographic, or signal data

Data

real-time enrichment, firmographic + tech-stack data

Also ships

official SDK

Outbound webhooks

event-driven integrations

Our verdict

Vanderbuild take

For GTM engineers and RevOps teams who need firmographic data at the infrastructure level — not wrapped in a sales UI — The Companies API is a credible option in the data enrichment and prospecting database space. The REST API is well-documented and the SDK availability means you can wrap this into your own MCP layer or agentic workflow cleanly when you need to; agentic readiness here is Capable, not native, so you're doing the orchestration work yourself. Pricing starts at $95/month but scales by credit volume and workspace, and the Enterprise tier at $595/month puts this squarely in procurement territory for most mid-market teams. The honest limitation is that there's no meaningful no-code interface — if your RevOps team can't write a webhook or hand off to an engineer, you won't get far without dedicated technical resources.

Mateusz Sekta

Founder, vanderbuild

Learn more

Our Resources

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

Enricher · Data source

Where this tool slots into an agentic pipeline.

Plays the role of Enricher + Data source in an agentic pipeline. Use it to add firmographic, technographic, and signal data to a lead row on the fly; source contacts, companies, and the raw inputs an agent needs to act.

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