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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles HaveIBeenPwned the way a machine reads it — 68 machine-readable artifacts across 8 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — HaveIBeenPwned scores 61.5/100 (strong), with a separate agent-readiness read of 48/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile HaveIBeenPwned
Each block below is one kind of artifact we hold for HaveIBeenPwned. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 8
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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.
Scroll within the panel for all 8 ·
Open Collections 2
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Have I Been Pwned API v3
OPEN COLLECTIONPwned Passwords API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Haveibeenpwned Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Haveibeenpwned Finops
FINOPSFeatures 8
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
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.
Scroll within the panel for all 8 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Haveibeenpwned Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
HaveIBeenPwned API Rules
SPECTRALHaveIBeenPwned API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
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 captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Hibp Breach Structure
JSON STRUCTUREHibp Paste Structure
JSON STRUCTUREHibp Subscription Status Structure
JSON STRUCTUREExamples 15
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Hibp List Breaches Example
EXAMPLEScroll within the panel for all 15 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
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 tell you where this provider already fits in a stack.
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 the provider offers on top of the raw API surface.
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
Every other property we hold for HaveIBeenPwned — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
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 4
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
← All providers · Data indexed from github.com/api-evangelist/haveibeenpwned · machine-readable index on apis.io