API

Power your workflows with Seamless data

The Seamless API gives developers direct access to real-time contact, company, and job-change intelligence — enabling you to automate enrichment, accelerate prospecting, and build revenue workflows at enterprise scale.

A Create New Connection block to setup a new API connection overlayed on top of the API Key table.

Trusted by 1M+ sales leaders worldwide

Real-time data. Unlimited automation. Endless potential.

The Seamless API brings our entire data engine — including verified contacts, enriched profiles, and company insights — directly into your systems so your GTM workflows stay accurate, fast, and fully automated.

  • 1.3B+
    verified contacts
  • 100+
    real-time data points per profile
  • 414M+
    verified mobile numbers
The API delivers

The enterprise API built for revenue automation

Designed for scale, the API offers programmatic access to contact search, company search, enrichment, and job-change intelligence — giving developers the tools to build smarter, faster, and more integrated GTM systems.

Search contacts and companies programmatically

Query millions of profiles with advanced filters to find ideal buyers, enrich CRM records, or automate prospect discovery inside any workflow or system.

A Code icon connected to a stack of contacts.

Enrich records with real-time accuracy

Fill missing fields or update outdated contact and company data through the enrichment endpoints — including titles, phone numbers, emails, roles, and job changes.

An outdated data point being enriched by Seamless with real-time data through an API connection.

Built for scale, speed, and reliability

Use bulk and singular endpoints, encrypted pagination, and asynchronous processing to power high-volume data operations without slowing down your systems.

A Create New Connection block to setup a new API connection.

Secure access and full developer control

Manage API keys, monitor usage, and build automations safely with enterprise-grade authentication, usage reporting, and detailed documentation.

A zoomed in mock up of an API Key table.
API is just the beginning

Accelerate your entire GTM motion with connected AI

The API powers custom revenue workflows — and Seamless extends them with a connected Data Engine, Engagement Hub, and Automation Network that bring AI, enrichment, and intent signals to every system in your stack.

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Mockup of the Seamless platform highlighting the Contacts screen with a contact selected and overlays for a recent job change, revenue, and a diagram of contacts that have been researched in the users Total Addressable Market.
Results that move revenue

“The quality of data I got from Seamless was accurate and life-changing. Like literally… I closed nearly half a million dollars from a free trial.”

Photo of Keith Kaskie.
Keith Kaskie
Vice President, Sales

More automation. More accuracy. More control.

For developers and operations teams who power revenue. Seamless gives you direct access to the data, intelligence, and endpoints you need to build world-class GTM systems.

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View API docs