Blog
Guides on B2B data and APIs
Practical writing on data enrichment, people and company search, and the API design decisions behind them, from the team building Kooperativa.
Reverse Email Lookup API Explained
How a reverse email lookup API resolves an email to a person's work history, title, and company, and what a realistic hit rate looks like.
Read articleClay Alternatives for B2B Data Teams
Clay's dual-credit system suits no-code workflow building. For teams that just need reliable API access to data, here are the alternatives.
Read articleApollo.io Alternatives for Growing Teams
Apollo's per-seat plus credit model gets expensive fast past its included allowance. How the real alternatives compare on price.
Read articleZoomInfo Alternatives in 2026
ZoomInfo is quote-only with a median annual contract around $31,875 to $33,500 (Vendr, 2026). How the real alternatives differ.
Read articleBuying Signals vs Firmographics in 2027
Static firmographic data tells you what a company is. Buying signals tell you when to act, and increasingly drive pipeline.
Read articleGDPR and the EU AI Act in 2027
GDPR enforcement is tightening around AI systems as the EU debates loosening some provisions for AI training, and what it means for 2027.
Read articleAI Outbound Reply Rates Are Falling in 2027
AI-assisted outbound volume is up roughly 6.4x per rep while reply rates have fallen. The real lever is data quality, not volume.
Read articleMCP Servers for B2B Data Access
Model Context Protocol is becoming the standard way AI agents call external tools, and what that means for a B2B data API.
Read articleAI Sales Agents Need a Real Data Layer
Gartner expects AI agents to outnumber sellers 10 to 1 by 2028, but most will not improve productivity. The gap is the data layer.
Read articleSetting Up a Webhook Monitor
A step-by-step walkthrough of creating a monitor, receiving the first signed webhook, and verifying it with real requests.
Read articleHow to Check an API's Uptime First
A vendor's "99.9% uptime" claim is unverifiable. A public status page tied to the real backend is not. What to check before you build on it.
Read articleAPI Error Codes: 404 vs 451 Explained
A 404 and a 451 both mean "no record," but imply different next steps. Conflating them is a design mistake that costs real retries.
Read articleAPI Rate Limits: Workspace vs Member
How a shared workspace rate limit interacts with a per-member allocation, and what happens when either one is exceeded.
Read articleColleagues API: Multi-Thread a Deal
Once you have one contact inside a target account, a colleagues API surfaces everyone else who works there, for multi-threading.
Read articleSimilar Profiles API: Build a Target List
A similar profiles API expands one ideal-customer example into a list of people matching the same seniority, industry, and geography.
Read articleInstitution Alumni Search API Guide
Searching alumni by school name misses profiles spelled differently. Here is why school_id is the more reliable filter.
Read articlePast Employees API: A Warmer Lead
A past employees API surfaces people who already know a company from the inside, a better outreach target than a cold list.
Read articleCurrent Employees API Guide
How a current employees API turns one company ID into a full roster, and the pagination pattern that avoids request timeouts.
Read articleCompany Search API: Filter by Industry
How a company search API should handle industry taxonomies, headcount ranges, and country codes, and common formatting mistakes.
Read articleReal-Time Webhooks for Company Monitoring
Why webhook-based monitoring beats polling for tracking people and company changes, and how to verify a payload is genuine.
Read articleGDPR Compliant B2B Data: What to Check
What GDPR requires from a B2B data provider, and the one question about erasure requests that most vendors cannot actually answer well.
Read articleAPI Pricing: Credits vs Flat Rate
A practical comparison of credit-based and flat-rate API pricing: the right model depends on whether your usage is predictable.
Read articleHiring Signals API: Spot Growth Early
How a hiring signals API works, and why headcount growth tends to lead revenue growth rather than follow it.
Read articleBulk Enrich API: The Match Rate Bug
How a bulk enrich API should handle partial failure, since conflating "not found" with "failed" makes match rate numbers unreliable.
Read articleJob Change Alerts as a Sales Signal
Job change alerts give sales teams a warm, natural reason to reach out to past prospects, and outperform most other signals.
Read articleCompany Enrichment API: Headcount by Seniority
What a company enrichment API should return beyond a flat employee count: seniority breakdown, since headcount alone hides structure.
Read articlePeople Search API: Exact Match vs Text Search
How filters actually behave in a people search API: first/last name are exact matches, full name and title are text search.
Read articleLinkedIn API Alternatives in 2026
LinkedIn has no public API for profile or company data. Here is how the LinkedIn API alternatives that fill that gap actually work.
Read articleB2B Data Enrichment API: Test Match Rate First
A practical guide to evaluating a B2B data enrichment API on match rate, freshness, and bulk reliability before you commit.
Read article