Klozeo
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MCP-native · API-first · AI-ready

The Lead Management APIfor the AI Era.

Store, score, and query your leads programmatically. Native Model Context Protocol (MCP) integration for Claude, Cursor, and your custom AI workflows.

Get Started for FreeRead the API Docs

No credit card required · Free tier includes MCP & scoring

GET /api/v1/leads
GET /api/v1/leads HTTP/1.1
X-API-Key: kl_live_f7a2c9d81e...

filter=and.gte.score.85
filter=and.lt.last_interaction_at.1711486800
filter=and.eq.attributes.interest.High-Value
sort_by=score
sort_order=DESC
limit=5
200 OKcount: 5 · has_more: false
Claude·via MCP · search_leads

I've identified 5 priority leads for follow-up. I automatically merged 2 duplicates detected via source_id and email.

Margot FeldsteinScore: 92

Status: Ready for Demo. Last note: "Requested pricing."

James HartwellScore: 88

Attribute industry: SaaS.

Shall I draft a personalized re-engagement email for Margot?

Core value

Built different, by design.

Developer-First Infrastructure

Full REST CRUD with a Go-powered core.

Build without boundaries. Deploy dynamic attributes—text, number, bool, list, or object—on the fly. Our architecture handles the complexity so you never have to run a schema migration again.

Built-in Lead Intelligence

Sophisticated 4-tier deduplication & scoring.

Stop the data rot. Our engine automatically merges profiles based on Email, Source ID, or 80%+ fuzzy name similarity, while custom expressions score your leads in real-time. Clean data, zero manual effort.

AI-Native via MCP

Your database as a living tool for AI agents.

Don't just store data—make it actionable. With native Model Context Protocol (MCP) support, your leads become instantly accessible to Claude Desktop, Cursor, Cline, and Goose for autonomous workflows.

Model Context Protocol

Give Your Data a Voice.

Stop building custom dashboards for every query. Klozeo exposes 13 specialized MCP tools—including search_leads, get_stats, and add_note—directly to your AI assistant.

Supported clients
Available tools
search_leadsget_leadcreate_leadupdate_leaddelete_leadlist_notesadd_noteget_statslist_scoring_rulesscore_leadbatch_scoreexport_leadslist_webhooks
Under the hood

Technical Powerhouse.

20+ operators

Advanced Filtering

Chain 20+ operators (AND/OR) across any field, including geographic within_radius searches with Haversine distance.

4-tier engine

"Last Touch Wins" Dedup

High-confidence merging on email or source_id, and 80%+ similarity matching for medium-confidence pairs. Always transparent.

500/req on Pro

High-Volume Batching

Batch creates, updates, or deletes with up to 500 leads per request on Pro, with partial success (207 Multi-Status) built in.

instant events

Real-time Webhooks

Get notified instantly when a lead is created, merged, or scored. Per-event subscriptions with configurable payloads.

Temporal Intelligence

Track Interest, Not Just Data.

Klozeo separates updated_at (structural field changes) from last_interaction_at (freshness of interest).

Sort leads by their most recent activity — a new form submission, an AI-triggered note, or an auto-merge — without losing track of when their profile data actually changed.

updated_atStructural field changes only
last_interaction_atAny push, merge, or AI-triggered event
Pricing

Simple, transparent pricing.

Start for free. Scale when you need to.

Free
$0

For personal projects and exploration.

  • Up to 500 leads
  • 100 req / 10 min
  • Batch size: 100 leads/req
  • MCP, Scoring & Notes
  • Community support
Start for free
ProMost popular
$49/ mo

For growing teams and production workloads.

  • Up to 50,000 leads
  • 1,000 req / 10 min
  • Batch size: 500 leads/req
  • MCP, Scoring & Notes
  • Priority email support
Get started
Enterprise
Custom

For large-scale operations and custom SLAs.

  • Unlimited leads
  • Custom throughput
  • Custom batch size
  • MCP, Scoring & Notes
  • SLA & Dedicated account manager
Contact us