XposedOrNot Breach Intelligence

What is XposedOrNot API?

Data breaches happen constantly, and most people only find out long after their email and passwords are already circulating. I built XposedOrNot so you don't have to wonder. Check an email or domain and know right away whether it's turned up in a known breach.

This repo is the API that powers it all: the breach lookups, the analytics, and the alerts. It's free to use, and it's open-source, so you can read exactly how every check works rather than taking my word for it.

Give it a try below, and if you find it useful, I'd love for you to build something with it.

Devanand Premkumar, creator of XposedOrNot

Quick Example

Check if an email has been exposed in data breaches:

curl https://api.xposedornot.com/v1/check-email/test@example.com

Response:

{
  "breaches": [["Adobe", "LinkedIn"]],
  "email": "test@example.com",
  "status": "success"
}

Get detailed breach analytics:

curl "https://api.xposedornot.com/v1/breach-analytics?email=test@example.com"

Rate Limits & API Access

• No API key required for basic endpoints (/v1/check-email, /v1/breach-analytics, /v1/breaches)
• API key required for domain breach monitoring — see Domain endpoints & API keys for how to get and use one

Rate limits are applied per IP, per endpoint:

Endpoint	Per second	Per hour	Per day
GET /v1/check-email/{email}	2	25	100
GET /v1/breach-analytics	2	25	100
GET /v1/breaches	2	50	100
POST /v1/domain-breaches/	2	25	50

When a limit is exceeded the API returns 429 Too Many Requests with a Retry-After header (seconds) and a JSON body carrying retry_after and reset_time, so clients can back off precisely.

Commercial use & higher rate limits

The free API above is for personal and low-volume use, and it stays free. If you're building a product on breach data or need more throughput, xonAPI+ offers paid plans from $5/month with rate limits up to 25,000 requests/minute, API-key access, and commercial support. It's the same breach data, and it's what keeps the free tier free.

For full documentation, see the API docs and the API playground.

API Endpoints

The full, always-current spec lives at /docs (Swagger) and /openapi.json. The endpoints you'll reach for most:

Breach lookups

Method	Path	What it does
GET	/v1/check-email/{email}	Quick check: is this email in a known breach?
GET	/v1/breach-analytics?email=	Detailed breach analytics for an email
GET	/v1/breaches	List all known breaches (optional ?domain=)
GET	/v1/domain-breach-summary	Summary of breaches for a domain

Stats & feeds

Method	Path	What it does
GET	/v1/metrics	Top-level breach metrics
GET	/v1/metrics/detailed	Expanded metrics
GET	/v1/metrics/domain/{domain}	Metrics for a single domain
GET	/v1/analytics/pulse	Recent breach activity pulse
GET	/v1/xon-pulse	XposedOrNot activity feed
GET	/v1/rss	Breach updates as an RSS feed

Domain endpoints & API keys

Breach data for a domain is only available once you've verified ownership of that domain, and calls are authenticated with an API key tied to your account.

Getting an API key — keys are issued and managed from the web console, not via a public endpoint:

1. Sign in at xposedornot.com.
2. Open your CxO Dashboard and verify the domain(s) you want to monitor.
3. Go to API Key Management (linked from the dashboard). Your key is shown there; use Reset API Key to rotate it.

Using the key — pass it in the x-api-key header. The domain-breaches endpoint takes no body; it returns breaches across all the domains you've verified:

curl -L -X POST \
  -H "x-api-key: <YOUR_API_KEY>" \
  -H "Content-Length: 0" \
  https://api.xposedornot.com/v1/domain-breaches/

An invalid key (or one with no verified domains) returns 401 Invalid or missing API key; omitting the x-api-key header entirely returns 422. See the API docs for the full domain verification and alert-subscription flows.

Use it from your AI tools (MCP)

XposedOrNot ships a built-in Model Context Protocol server, so AI assistants can check breaches directly. Point your MCP client at https://api.xposedornot.com/mcp (Streamable HTTP, JSON-RPC 2.0 over POST). No API key or authentication is needed; all tools are read-only and never return passwords.

Tools exposed:

• check_email_breaches: check if an email appears in any known breach
• get_breach_analytics: detailed breach history, risk score and paste exposure for an email
• list_breaches: browse the breach catalog, filter by domain or breach ID
• domain_breach_summary: aggregate breach counts for a domain
• get_breach_metrics: system-wide breach statistics
• get_recent_breaches: most recently added breaches, newest first

Quick connect:

claude mcp add --transport http xposedornot https://api.xposedornot.com/mcp

For Cline, Cursor, Gemini CLI and other clients, see llms-install.md. A machine-readable server card is at https://api.xposedornot.com/.well-known/mcp/server-card.json.

A quick tools/list call:

curl -X POST https://api.xposedornot.com/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Why use XposedOrNot API?

XposedOrNot was the first open-source tool to monitor and alert on data breaches, and this API gives you direct access to everything it has collected and keeps current. With it you can:

• Check whether an email has appeared in a known data breach, with stats on where and when
• See if an email shows up in public pastes
• Run a single combined search across both breaches and pastes
• Check whether a password has been exposed without ever revealing your identity

Prefer to just look something up without writing code? You can do all of this on the website too: https://xposedornot.com.

Security

This project is fully open-source and uses automated security tooling (Black, Pylint, CodeQL, OpenSSF Scorecard). For security details, see SECURITY.md.

Please do not report security vulnerabilities through public GitHub issues. Instead, refer to our Responsible Disclosure Guidelines for reporting these issues in a secure manner.

Prerequisites

• Docker (recommended): Docker 20.10+ and Docker Compose V2
• Local install: Python 3.11+, Google Cloud SDK

Quick Start for Local Development

Using Docker Compose (Recommended)

1. Clone the Repository:

   git clone https://github.com/XposedOrNot/XposedOrNot-API
   

2. Update the necessary environment variables in the docker-compose.yml file if needed, then run:

   docker compose up
   

   This command will build API and Datastore Docker images. Note that the project source directory is mapped in the Docker container, so any changes in the source code won't require rebuilding the Docker image.

Local Installation

1. Clone the Repository:

   git clone https://github.com/XposedOrNot/XposedOrNot-API
   

2. Install Required Packages

   sudo apt-get install -y python3-pip build-essential libffi-dev python3-dev
   

   Then install the gcloud CLI — it's not in the stock Debian/Ubuntu repositories and is needed for step 4 (Datastore authentication or the local emulator).

3. Install Python Libraries

   pip3 install -r requirements.txt
   

4. Setup Google Cloud Datastore

   Before running XposedOrNot-API, choose one of the following options:

• Run local Google DataStore emulator and debug using the local emulator rather than directly connect to Google DataStore.

  # For posix platforms, e.g. linux, mac:
  gcloud beta emulators datastore start
  

• Authenticate to Google DataStore and directly debug using Google DataStore.

5. Run the application

   python3 main.py
   

Configuration

Configuration is read from environment variables. For Docker Compose these are already set in docker-compose.yml; for a local install, copy .env.example to .env and fill in the values (or export them in your shell).

Required (the app won't start without these)

Variable	What it's for
SECRET_APIKEY	Secret used to sign issued API keys
SECURITY_SALT	Salt for signing verification tokens
WTF_CSRF_SECRET_KEY	CSRF protection secret
ENCRYPTION_KEY	Fernet key for encrypting stored data
AUTH_EMAIL	Cloudflare account email
AUTHKEY	Cloudflare API key
CF_MAGIC	Cloudflare integration token
CF_UNBLOCK_MAGIC	Cloudflare unblock token
MJ_API_KEY	Mailjet API key, for sending alert emails (mailjet.com)
MJ_API_SECRET	Mailjet API secret

For local development you can set these to any placeholder value; the defaults in docker-compose.yml show the expected format.

Redis (rate limiting & state)

Variable	Default	Notes
REDIS_HOST	localhost	Redis host
REDIS_PORT	6379	Redis port
REDIS_DB	0	Redis database number
REDIS_PASSWORD	(none)	Set if your Redis requires auth

Google Cloud (Datastore & Pub/Sub)

Variable	Default	Notes
PROJECT_ID	(none)	GCP project ID
DATASTORE_EMULATOR_HOST	(none)	Point at the local emulator, e.g. localhost:8000
TOPIC_ID	(none)	Pub/Sub topic for the live-visitor globe feed

Optional

Variable	Default	Notes
ENVIRONMENT	production	production or development
BASE_URL	https://api.xposedornot.com	Public base URL used in links
PORT	8080	Port the server listens on
ENABLE_SCHEDULER	false	Run the background digest scheduler
DEBUG_EMAIL	(none)	Override recipient for debug emails
SENIORITY_ENRICH_URL / SENIORITY_ENRICH_SECRET	(none)	External seniority-enrichment service
DOMAIN_EMAIL_LIMITS_ENABLED	true	Kill switch for domain email verification anti-bombing limits
DOMAIN_EMAIL_RECIPIENT_COOLDOWN_SECONDS	900	Cooldown between challenges to the same role address
DOMAIN_EMAIL_DOMAIN_MAX_PER_HOUR	5	Max verification emails per domain per hour
DOMAIN_EMAIL_IP_MAX_PER_HOUR	10	Max verification emails per client IP per hour
DOMAIN_EMAIL_GLOBAL_DAILY_BUDGET	2000	Global daily cap on verification emails

Contributing

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Authors

• Devanand Premkumar - Initial work - DevaOnBreaches

License

This project is licensed under the MIT License - see the LICENSE file for details

Acknowledgments

• Thanks to the Python community and the maintainers of every library this project leans on. XposedOrNot stands on your work.

• And to everyone who has reviewed the code and reported issues: thank you. A second set of eyes catches what I can't.

Show Your Support

If this saved you some trouble, a few things genuinely help:

• ⭐ Star the repo so others can find it
• Fork it and send a pull request; contributions are welcome
• Share it with someone who'd find it useful