Have I Been Pwned MCP server

• Addresshttps://haveibeenpwned.com/mcpnot in the official registry: answered when asked

No entry in the official MCP registry names this server. It answered on haveibeenpwned.com when the Atlas asked at the address servers are usually mounted on, so it is the vendor's own. Clients and catalogues that list servers from the registry do not show it.

• Stateanswerschecked 2026-10-30
• Tools17
• Server calls itselfhibp-mcp-server
• Server version0.0.0
• Protocol version2025-06-18

On 2026-10-30 the server answered initialize and tools/list without a sign-in. First answer in 57 ms.

• Its tools do every use case we checked: check whether an email address appeared in data breaches; monitor your own domains for breached addresses; check whether passwords appear in known breach dumps.
• Checked on 6 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
• What an agent can do with it3 of 3 use cases
• Answeredmeasuring6 of the 7 daily checks it takes to print a share
• Median first answer53 ms
• Space in an agent's context≈ 3,823 tokensthe definitions of all its tools (17), which an agent carries on every turn
• Tool definitionsA · 100 of 100
• Typed results17 of 17 toolsdeclared outputSchema: results come typed, read once

• Every tool passes all six checks.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• hibp_list_breaches

  List public HIBP breaches, optionally filtered by domain, spam-list flag, and verification status.

• hibp_get_breach

  Look up a single public HIBP breach by its canonical breach name, such as Adobe.

• hibp_get_latest_breach

  Return the most recently added public breach currently loaded into HIBP.

• hibp_list_data_classes

  List the data classes used across public HIBP breach models, such as email addresses or passwords.

• hibp_get_pwned_passwords_range

  Query the public Pwned Passwords k-anonymity API with a 5-character SHA-1 or NTLM prefix and return matching suffixes with prevalence counts.

• hibp_get_breached_account

  Search HIBP for breaches affecting a single email address. Requires an OAuth bearer token linked to an active HIBP API subscription; use domain and verification filters to refine the result.

• hibp_get_breached_account_range

  Query the authenticated HIBP k-anonymity breached-account range endpoint with the first 6 characters of a SHA-1 email hash. Requires a subscription with k-anonymity access; compare each returned suffix with the remaining hash characters…

• hibp_get_paste_account

  Search for public pastes containing a single email address. Requires an OAuth bearer token linked to an active HIBP API subscription; run this separately from breached-account lookup.

• hibp_get_breached_domain

  Return breached aliases for a verified domain. This tool requires an authorized subscription via OAuth bearer token.

• hibp_list_subscribed_domains

  List the domains associated with the authenticated HIBP subscription.

• hibp_get_subscription_status

  Return the current plan, quotas, rate limits, expiry, and feature flags for the active HIBP API subscription linked to the authenticated OAuth connection. Use it to confirm access before feature-dependent lookups.

• hibp_get_stealer_logs_by_email

  Return website domains historically observed in stealer logs for an email address. Requires an OAuth-linked active subscription with the stealer-log feature; results do not establish current account access.

• hibp_get_stealer_logs_by_website_domain

  Return email addresses historically observed in stealer logs for a website domain. Requires an OAuth-linked active subscription with the stealer-log feature; results do not establish current account access.

• hibp_get_stealer_logs_by_email_domain

  Return email aliases and associated website domains historically observed in stealer logs for an email domain. Requires an OAuth-linked active subscription with the stealer-log feature; results do not establish current account access.

• hibp_generate_domain_verification_dns_token

  Generate the TXT record value required to verify domain control via DNS, creating or reusing the private HIBP domain-verification records needed for the request. Requires an authenticated subscription with domain-verification access.

• hibp_verify_domain_verification_dns_token

  Complete domain verification by checking the expected HIBP TXT record on the target domain. Requires an authenticated subscription with domain-verification access.

• hibp_send_domain_verification_email

  Send a domain verification email to an approved alias such as admin or security. Requires an authenticated subscription with domain-verification access.