Developer API Hub to Power Your Apps with Verified Data

Build smarter products, workflows, and automations using our developer-first enrichment and verification APIs. Exellius gives you programmatic access to the most accurate B2B data infrastructure on the web.

Enrich leads, validate emails, and search for contacts — all through a flexible, well-documented REST API built for scale and reliability.

Real-time email verification & enrichment endpoints
Bulk operations with async processing support
Secure token-based authentication

Why Developers Choose Exellius API Hub

01.Powerful RESTful API

Our developer-first API is designed for speed, scale, and simplicity. Whether you're enriching leads or verifying emails, get real-time data in a few lines of code.

Modern JSON-based endpoints
Predictable, easy-to-integrate format
Fast responses & scalable infra
Rate limits to match your growth

Built by engineers—for engineers.

02.Bulk Operations at Scale

Automate large-scale data processing without bottlenecks. Our bulk endpoints allow you to clean, enrich, and verify leads with minimal effort.

Async bulk enrichment with job status
Up to 100,000 records per call
CSV and JSON input supported
Webhook callbacks for completion

03.Secure & Compliant

We take data protection seriously. Every API call is encrypted, rate-controlled, and monitored. GDPR and CCPA-ready with full audit trails.

04.Developer-Friendly Docs

Our API docs are interactive and easy to follow—with clear examples, sandbox testing, and Postman collections to speed up your dev time.

05.Flexible Authentication & Keys

Issue and manage API keys via dashboard. Use environment-based key control for staging vs. production. Rotate securely with no downtime.

Built for Developers, Powered by Speed & Scale

Powerful REST API for B2B Data

Designed for seamless integration, our RESTful API delivers enriched B2B contact and company data directly into your stack with speed and precision.

Fast JSON responses with scalable infrastructure
Developer-friendly docs and real-time testing sandbox
Secure API key management with rate limiting and usage logs
Global coverage across 100+ countries with verified data

Automated Enrichment via Webhooks

Keep your systems enriched and updated in real time. Our webhook support allows you to automate data delivery, syncing enriched leads wherever they enter your funnel.

Trigger enrichment on lead form submission
Auto-sync enriched data to your CRM or backend
Low-latency callbacks with secure payloads
Custom webhook routing for multi-system use cases

Get Deep Firmographic & Technographic Context

Go beyond just emails and names. Every API response can include rich company data to support deeper segmentation and smarter personalization.

Company size, revenue & funding info
Tech stack tags (e.g., Salesforce, AWS, Stripe)
Industry classifications and NAICS codes
Recent hiring trends and growth signals

Target the Right People with Precision

Integrate high-precision targeting into your workflows. Our API supports rich filtering so your outbound efforts reach the right audience, every time.

Filter by job function and seniority level
Segment by industry, employee size & region
Target users of specific tech stacks
Prioritize accounts showing buyer intent

Industries We Serve

We offer B2B lead data for multiple industries, including:

Technology & SaaS

Healthcare & Pharma

Finance & Banking

Manufacturing & Logistics

Retail & E-commerce

Developer FAQs for the Exellius API

You can enrich contacts, validate emails, search decision-makers by filters, and sync verified data to your systems—all programmatically through our RESTful endpoints.