LeakCheck
Operator: LEAKCHECK SECURITY SERVICES LTD, United Kingdom
Data breach search with a free preview, paid records, monitoring and an API.
Leaks, Breaches & Infostealers
Product
LeakCheck, a hosted data breach search with a web interface, Telegram bot and API. The optional local CLI client queries the same service.
Availability and source date
Active
As of: 16 October 2026.
No functionality test has been performed.
Use in OSINT research
Links known email addresses, usernames or telephone numbers to data breach sources. Higher-tier plans provide the records they contain and additional search types.
Queries
| Input | Result | Result type |
|---|---|---|
| Email address + Username / alias + Phone number | Free web preview: affected breaches and categories of exposed data, not complete data values. | Retrieved |
| Email address + Username / alias + Phone number + Keyword / free text | Paid search: matching records with the fields present in each breach. Search types and scope depend on the plan. | Retrieved |
| Domain / website | Enterprise: leaked accounts for a domain or matches in infostealer logs by source website. | Retrieved |
| Password (plaintext) + Password hash | Enterprise: records matching a password or its SHA-256 hash. | Retrieved |
Features
- Searches breaches by email address, username, telephone number or keyword, depending on the plan.
- Shows free source references separately from paid full records.
- Monitors identifiers and reports new matches, for example by email, Telegram or webhook.
- Searches domains and infostealer logs on the Enterprise plan.
- Processes lists of up to 100,000 lines per file and 500,000 daily on the Enterprise plan.
- Exports results as PDF or CSV; the API returns structured responses.
Categories
- Leaks, Breaches & Infostealers
- Breach search
- Stealer logs
Coverage
Dataset
The provider reports over 10 billion records and 1,470 breach sources (16 October 2026). It does not specify complete country coverage.
Access
Installation and deployment
Website · Locally installable
Web service and Telegram bot. Optional locally installable Python CLI client for the hosted LeakCheck API; the database does not run on your own computer.
Requirements
Free web preview and Public API without an API key. Paid records require an account, and the Pro API requires a key. Advanced features require the appropriate plan.
Export
PDF and CSV through the web interface; JSON through the API and optional CLI client.
Provider
LEAKCHECK SECURITY SERVICES LTD
Country of establishment
United Kingdom
Interfaces
API
Available. Public API free without a key: sources and data categories, 1 request per second. Pro API from Monthly upwards: full records, key required, usually 3 requests per second. Domain, password and source searches require Enterprise.
MCP
Not documented. No MCP or AI agent integration of its own is described in the API overview or official CLI guide.
AI agents
Not documented. No MCP or AI agent integration of its own is described in the API overview or official CLI guide.
Usage note
The terms prohibit searches for government and government agency domains and collecting or disclosing other people’s personal data without a legal basis.
Legal note
Limitations
- The free preview shows breach sources and data categories, not complete data values.
- Search types, monitoring and query allowances depend on the plan.
- The terms exclude government agency domains from searches and monitoring.
Guides and practical reports
Official · LeakCheck: API introduction and search types
LeakCheck · EN
Explains the free Public API, the Pro API and their different results.