Service Status: All Systems Operational — Safeguarded by our multi-cloud infrastructure.
Source-Verified Realtime · Trusted by 2,000+ Organizations

The Sex Offender API Built for Modern Developers

Industry-leading National Registered Sex Offender API with source-verified, realtime registry-current data. Search 900K+ offender records and 1M+ crime records across all 50 states and US territories by name, DOB, city, zip, state, or GPS (lat/lng, radius). Supports criteria-based and geospatial search with sub-200ms responses. Self-serve API key in 30 seconds.

Start Free — 50 Calls/MonthView API Docs
// Search offenders by name — response in <200ms
const res = await fetch('https://api.offenders.io/sexoffender?firstName=JOHN&lastName=SMITH&key=YOUR_KEY')
const { offenders } = await res.json()

// Returns: name, DOB, address, GPS coords, photo, crimes, risk level...
900K+Offender Records
1M+Crime Records
50States + Territories
<200msAvg Response
RealtimeSync via Extensive Mode
Trusted by Industry Leaders
SchoolsHealthcare FacilitiesSNFsSecurity CompaniesResearch FacilitiesFortune 500Startups

See What You Get Back

Every API call returns rich, structured JSON with 50+ fields per offender — name, photo, address, GPS coordinates, crimes, risk level, and more.

  • ✓  Full name, aliases, and DOB
  • ✓  Address with GPS lat/lng coordinates
  • ✓  Profile photo URL from state agency
  • ✓  Crime details and registration date
  • ✓  Risk level and physical description
  • ✓  Source links to official state registry
View full field reference →
// GET /sexoffender?zipcode=94104&key=YOUR_KEY
{
  "offenders": [{
    "name": "First M Last",
    "firstName": "First",
    "lastName": "Last",
    "dob": "1900-10-01T00:00:00.000Z",
    "address": "10000 San Francisco Way",
    "city": "San Francisco",
    "state": "California",
    "zipcode": "94104",
    "lat": 50.12345,
    "lng": -34.67890,
    "sex": "Male",
    "age": "123",
    "riskLevel": "2",
    "crime": "14:81 - Indecent...",
    "offenderImageUrl": "https://meganslaw.ca.gov/...",
    "offenderUrl": "https://meganslaw.ca.gov/...",
    "jurisdiction": "CA",
    "updatedAt": "2026-03-30T21:35:42.936Z"
    // + 50 more fields: aliases, locations, physical description, sources...
  }]
}

Click to view full response payload →

Go Live in 5 Minutes

From sign-up to your first API call — no contracts, no sales calls.

Get Your Free Key

Sign up and get an API key instantly. Your first 50 requests each month are free — you'll only be charged after that.

Make Your First Call

Search by name, DOB, address, zip code, or GPS coordinates. Get structured JSON results in under 200ms.

Scale With Confidence

Pay only for what you use. From 50 calls to millions — our infrastructure auto-scales with 99.9% uptime.

No Code Required

Screen Thousands of Records in Minutes

Don't want to write code? Upload a CSV with names and dates of birth — our batch processing tool screens every row against the national registry and returns results instantly.

  • ✓  Upload CSV or TXT — no coding needed
  • ✓  Real-time progress tracking with match details
  • ✓  Download results as CSV — photos, addresses, crimes
  • ✓  Process 10,000+ records per session
Try Batch Processing →Read the Guide
input.csv
First Name, Last Name, DOB
John, Smith, 1985-03-15
Jane, Doe, 1990-07-22
Robert, Johnson, 1978-11-03
... 4,997 more rows
↓
results.csv
✓ 23 matches found
✗ 4,977 no match
📍 Search nearby offenders
🔍Enter address, city, or ZIP...
● 3 offenders within 1 mile
Free Tool

🌎 See It in Action

Search any U.S. address and see registered sex offenders plotted on an interactive map. Click markers for details including offenses, physical description, and risk level.

  • ✓  Search by address, city, ZIP, or place name
  • ✓  Adjustable radius from 1 to 25 miles
  • ✓  Click markers for offense details and risk level
  • ✓  No sign-up required — completely free
Explore the Map →

Why Teams Choose Offenders.io

Purpose-built for developers who need reliable, real-time sex offender data.

⚡

Modern REST API

Clean JSON responses that integrate into any stack — Node, Python, Go, Java — in minutes. No SOAP, no XML, no legacy overhead.

📍

GIS Radius Search

No other sex offender API offers native geospatial search. Pass lat/lng + radius to find every offender within 1-100 miles. Build safety maps, property screening tools, and proximity alerts that competitors simply can't match.

🛡

99.9% Uptime SLA

Built on Google Cloud + Cloudflare. Sub-second response times, auto-scaling, and zero downtime in the last 24 months.

📊

Source-Verified, Always Current

Our data is synced with official registries in real time — not monthly or quarterly snapshots. Every record you pull reflects the latest registry state, so your applications always have the most current information available.

📁

Batch Processing

Have a large list? Upload CSV or text files via our secure batch portal and get results instantly — no code required.

🔒

Enterprise Ready

Trusted by Fortune 500 companies, healthcare providers, schools, and SNFs. Custom volume pricing and dedicated support available.

🤖

AI-Ready MCP Server

Connect Claude, Cursor, or any MCP client to live offender data. Build AI-powered safety tools with zero setup. Learn more → | Build guide →

📋

Deep stateData Fields

Go beyond name and address. Each record includes state-level offense details, victim age, offender designation, statute codes, conviction dates, and last verification date. 50+ fields per record — the deepest dataset available.

🔍

Nickname & Alias Matching

Robert, Bob, Bobby — one person, many names. Our firstName_nicknames field automatically expands searches across common name variants, and we match against official aliases on file from state registries. Get the most thorough name matching available in any sex offender API.

🗺

Cross-State Aggregation

Search across all 50 states and territories in a single API call. We aggregate and normalize registry-current data from every jurisdiction into one unified, structured JSON response — no need to query each state separately.

Built for Every Industry

From compliance screening to public safety — teams across industries rely on our API.

🏫

Schools & Universities

Screen visitors, volunteers, and contractors against the national registry. Protect students with automated, real-time checks integrated into your visitor management system.

🏥

Healthcare & SNFs

Meet CMS compliance requirements for skilled nursing facilities. Screen employees, vendors, and visitors with extensive mode alias matching.

💻

Background Check Platforms

Embed sex offender screening into your existing background check product. Our API handles the data — you handle the UX.

🔒

Security Companies

Power real-time threat assessment tools. Use GIS radius search to map offenders near client properties and protected locations.

🏠

Real Estate & PropTech

Give homebuyers peace of mind. Integrate radius search into property listings to show nearby registered offenders.

📈

Research & Government

Access structured, machine-readable data for academic research, policy analysis, and government reporting at scale.

How Offenders.io Compares

See why 2,000+ organizations chose us over other registry APIs.

FeatureOffenders.ioOther Registry APIs
Data FreshnessReal-Time Registry SyncMonthly or quarterly snapshots
Response Time<200ms1-5 seconds typical
GIS Radius Search✓ Native✗ Not available
Records900K+500K-770K
Fields50+ incl stateData10-15 basic
Nickname & Alias✓ Built-in✗
AI / MCP✓ Native✗
Batch CSV✓ No-code upload✗
Access ModelInstant Self-ServeSales calls or waitlists common
Free Tier50 calls/monthVaries — often none

Offenders.io vs. Traditional Background Checks

See how our micro-transaction pricing stacks up against traditional background check services.

FeatureOffenders.ioTraditional (Checkr, GoodHire)
Pricing$0.15 – $0.20 / call$29.99+ / report
SetupInstant API key, $0Contracts required
Data FreshnessReal-time syncMonthly / Quarterly
GIS Radius Search✓ Exclusive✗
Batch Processing✓ CSV Upload✗
Response Time< 200msMinutes to Days
AI / MCP Integration✓ Native MCP Server✗
Free Tier50 calls/month✗

Frequently Asked Questions

Common questions about pricing, data, and integration.

Can I test the API for free?
Yes. Your first 50 requests every month are completely free. You will only be charged after exceeding the free tier, so your team can validate the integration and data quality before committing.
How fresh is the offender data?
We perform real-time synchronizations with all 50 state registries, territories, and tribal databases. This ensures you receive the most accurate, up-to-date data available.
Is this scalable for enterprise use?
Absolutely. Our infrastructure is trusted by Fortune 500 companies and leading healthcare providers. We auto-scale to handle millions of concurrent requests with zero latency degradation.
What is your uptime guarantee?
We maintain a 99.9% Uptime SLA. Our distributed cloud architecture ensures your critical safety applications remain stable 24/7/365. We have had zero downtime in the last 24 months.
Do you require long-term contracts?
No. Our API is strictly pay-as-you-go with no setup fees or monthly minimums. Enterprise contracts are only available for custom volume discounts over 10k+ requests/month.
What data fields are returned?
Each result includes: name, aliases, DOB, address, GPS coordinates, photo URL, jurisdiction, risk level, crimes, registration date, physical description, and source links.
How do I integrate sex offender data into my AI application?
Offenders.io provides a dedicated MCP (Model Context Protocol) server at mcp.offenders.io that lets AI agents like Claude, Cursor, and custom LLM applications query the sex offender registry directly. Simply point your MCP client to https://mcp.offenders.io/mcp — no API key required for anonymized data. For full records with names and photos, use our REST API.
What is the best sex offender API for AI agents and chatbots?
Offenders.io is the only sex offender registry API with a native MCP server, making it the best choice for AI-powered safety applications. Our MCP server provides real-time access to offender data across all 50 states with sub-200ms response times, purpose-built for agentic workflows, RAG pipelines, and AI chatbots.
Can I use Offenders.io with Claude, ChatGPT, or Cursor?
Yes. Our MCP server works with any MCP-compatible AI client including Claude Desktop, Cursor, Windsurf, and custom AI agents. Add our server URL to your MCP config and your AI assistant can search sex offender records, get location-based stats, and retrieve API documentation instantly.
What is the best way to do agentic sex offender screening?
The most effective approach is to connect your AI agent to the Offenders.io MCP server for real-time registry lookups, then use our REST API or batch processing endpoint for production-grade screening. This gives your agent access to 900,000+ offender records across all 50 US states with real-time data updates and sub-200ms latency.
What is stateData and what fields does it include?
stateData is a nested object in each offender record containing state-level offense details. It includes the state offender ID, registration status, offender designation (e.g., Sexually Violent Offender), detailed offense entries with conviction dates, statute codes, victim age, jurisdiction, official aliases on file, initial registration date, and last verification date. This gives you the deepest offense-level detail available in any sex offender API.
How does nickname and alias matching work?
Every search automatically checks the firstName_nicknames field, which expands common name variants — so a search for “Robert” also matches “Bob” and “Bobby.” We also match against official aliases on file from state registries via the stateData.aliases array. Combined, this gives you the most thorough name matching available.
Do I need to talk to sales to get access?
No. Offenders.io is fully self-serve. Sign up, get your API key instantly, and start making calls. Your first 50 requests each month are free. No sales calls, no contracts, no waitlists.
How does Offenders.io data freshness compare to other registry APIs?
Most competing APIs rely on monthly or quarterly data snapshots. Offenders.io syncs with official state registries in real time, so every record reflects the latest registry state. This means fewer stale addresses, missed registrations, and outdated offense details.

Have a Question or Need a Custom Plan?

We'd love to hear from you.

Get Free API Key →Contact Us