Blog
Engineering, product, and data insights.
Evaluating Agent Tool Calls
Most agent evals grade the final answer. The harder failure is a tool returning 200 OK with an empty field. Evaluate the data your agent got, in Python and JS.
Mining Monthly Workforce Signals
Hiring spikes, attrition, and headcount inflections are buying and investment signals. Build a monthly watchlist monitor in Python and JavaScript.
How to Code an Enrichment Waterfall
A Python and JavaScript walkthrough of waterfall enrichment: provider fall-through, field-level merge, conflict resolution, caching, and cost control.
AI Sales Reps and What's Really Powering Them
AI SDRs are a $4B market headed to $15B. Here's how they actually work under the hood, and why the data matters more than the model.
What Makes Person Data Actually Reliable
People change jobs constantly, so B2B data goes stale fast. Learn how sourcing, refresh cadence, and compliance separate reliable person data from the rest.
Your AI Tools Are Only as Good as the Data Behind Them
60% of AI projects fail because of bad data, not bad models. Why the data layer determines whether your AI tools actually work.
CCPA Compliance for B2B Data Teams in 2026
What changed for B2B data teams under CCPA in 2026. DROP platform, ADMT rules, risk assessments, and what to ask your data providers.
Our New Pricing: Flat-Rate Enrichment, No Sales Call
We cut our enrichment pricing to a flat, public, per-record rate: $0.05 per person, $0.025 per company, $10 to start, no sales call. Here's the thinking.
What Is Data Enrichment (and Why It Matters)
Data enrichment transforms sparse records into complete profiles. Learn the types, see a before-and-after example, and understand why real-time beats batch.
A Prospect Research Agent with Claude Code + datalegion-cli
Build a prospect research agent in 10 minutes with Claude Code + datalegion-cli. Outputs a per-account dossier and per-contact email-sequence outlines.
Natural Language Search for People Data
Natural language search lets anyone query B2B people data in plain English. Search millions of professional profiles without SQL or a developer.
The CRM Data Hygiene Playbook
A quarterly playbook for cleaning your CRM data. Covers deduplication, standardization, enrichment fill rates, and decay monitoring for RevOps teams.
API, SDK, MCP, CLI: Building Data Products for the Agent Era
How we built four interfaces to the same data and why AI agents work best with a CLI. Introducing datalegion-cli.
Lead Scoring with Enriched Data
Most lead scoring models fail because the data is incomplete. How to build, calibrate, and maintain a scoring model powered by enrichment.
The GTM Engineer's Guide to Data Enrichment
GTM engineers own the data layer powering sales workflows. Learn how to evaluate enrichment APIs, build waterfall enrichment, and avoid common pitfalls.
Person Search Beyond Prospecting
Person search APIs aren't just for prospecting. Five use cases across recruiting, fraud detection, market sizing, and more.
Building a Real-Time Enrichment Pipeline with a Person API
Stop exporting CSVs. Build a real-time data enrichment pipeline with a person API that enriches leads the moment they enter your system.
How to Enrich Clay Tables with Data Legion
Set up Data Legion's Person Enrich API as a Clay HTTP API integration. Step-by-step configuration for endpoint, auth, request body, and response mapping.
How to Choose a B2B Data Provider
A framework for evaluating B2B data providers across five dimensions that actually matter. Coverage, accuracy, freshness, compliance, and delivery.
Reverse Email Lookup: How It Works and When to Use It
Reverse email lookup turns an email into a full professional profile. Learn how it works, common B2B use cases, and how to integrate it via API.