HaveIBeenPwned
Have I Been Pwned (HIBP) is Troy Hunt's free breach-notification and credential-exposure service. The HIBP API v3 lets clients search for email addresses, pastes, stealer-log entries, and monitored domains across the world's largest aggregated breach corpus. A separate free k-anonymity password lookup is offered at api.pwnedpasswords.com.
HaveIBeenPwned publishes 8 APIs on the APIs.io network, including Breached Accounts API, Breaches API, Data Classes API, and 5 more. Tagged areas include Security, Breach Notification, Credential Stuffing, Stealer Logs, and K-Anonymity.
The HaveIBeenPwned catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
HaveIBeenPwned’s developer surface includes authentication, developer portal, signup flow, pricing, engineering blog, support, FAQ, and 19 more developer resources.
Kin Score
APIs 8
Individual APIs this provider publishes, each with its own machine-readable definition.
HaveIBeenPwned Breached Accounts API
Lookup breaches affecting an email address.
HaveIBeenPwned Breaches API
Browse breach metadata in the HIBP corpus.
HaveIBeenPwned Data Classes API
Enumerate classes of data exposed across breaches.
HaveIBeenPwned Domain Search API
Verify and search domains you control.
HaveIBeenPwned Pastes API
Lookup pastes referencing an email address.
HaveIBeenPwned Range Search API
K-anonymity range search for password hashes.
HaveIBeenPwned Stealer Logs API
Search infostealer malware corpora by email or domain.
HaveIBeenPwned Subscription API
Inspect the calling key's subscription state.
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Postman Collections 8
Ready-to-run Postman collections for exercising this provider's APIs.
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Open Collections 2
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Have I Been Pwned API v3
OPEN COLLECTIONPwned Passwords API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Haveibeenpwned Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Haveibeenpwned Finops
FINOPSFeatures 8
Notable capabilities this provider offers.
Email Breach Search
Lookup all breaches containing an email address.
K-Anonymity Email Search
Privacy-preserving breach lookup by SHA-1 prefix.
Paste Search
Discover paste-site dumps referencing an email.
Stealer Log Lookup
Surface infostealer captures by email, website domain, or email domain.
Domain Monitoring
Subscribe to monitor owned domains via DNS or email verification.
Subscribed Domains Inventory
Inspect monitored domains and pending renewals.
Pwned Passwords (Free)
K-anonymity password compromise lookups with optional response padding.
Subscription Tier Introspection
Inspect the calling key's tier, RPM, and feature flags.
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Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Haveibeenpwned Context
JSON-LDSpectral Rules 2
Spectral governance rulesets for linting and validating these APIs.
HaveIBeenPwned API Rules
SPECTRALHaveIBeenPwned API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions for this provider's data models.
Breach
JSON SCHEMABreachedAccountRangeEntry
JSON SCHEMAPaste
JSON SCHEMASubscribedDomain
JSON SCHEMASubscriptionStatus
JSON SCHEMAPwnedPasswordsRangeResult
JSON SCHEMAJSON Structure 3
JSON Structure definitions describing this provider's data shapes.
Hibp Breach Structure
JSON STRUCTUREHibp Paste Structure
JSON STRUCTUREHibp Subscription Status Structure
JSON STRUCTUREExamples 15
Example request and response payloads for these APIs.
Hibp List Breaches Example
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Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers build with this provider.
Account Takeover Prevention
Block sign-ups using credentials known to be in public breaches.
Incident Response Triage
Quickly enumerate breaches and pastes touching an affected user.
Domain Risk Monitoring
Continuously detect when a domain's users appear in new breaches.
Password Strength Enforcement
Reject candidate passwords already present in the Pwned Passwords corpus.
Stealer Log Notification
Detect infostealer-captured credentials before adversaries weaponize them.
Integrations 5
Pre-built integrations with other platforms and tools.
1Password Watchtower
1Password leverages Pwned Passwords to flag compromised credentials.
Mozilla Firefox Monitor
Firefox's breach-notification feature is powered by HIBP.
Okta / Auth0
Identity providers use Pwned Passwords to enforce password policies.
Cloudflare
Cloudflare hosts and accelerates the Pwned Passwords k-anonymity API.
Microsoft Entra (Azure AD)
Banned-password lists can incorporate Pwned Passwords data.
Solutions 6
Packaged solutions this provider offers.
Pwned 1
Entry tier ($3.95/mo) for hobbyists and small projects.
Pwned 2
Mid-volume tier with stealer-log access.
Pwned 3
High-volume tier for security vendors and MSSPs.
Pwned 4
Enterprise tier with auto subdomain verification.
Pwned 5
Top tier ($995/mo) for large identity-protection platforms.
Pwned Passwords (Free)
Always-free k-anonymity password lookup at api.pwnedpasswords.com.
Resources
Get Started 2
Portal, sign-up, and the first successful call
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 5
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type