Sex Offender API with Nationwide Coverage

A few providers offer nationwide sex offender data through API access, but the coverage, update frequency, and pricing vary a lot. Nannostomus is one of the options you can try right away — it includes all 50 states and U.S. territories, updates monthly, comes with a detailed report, and gives you 100 free requests every month.

You can use Nannostomus API with U.S. sex offender records to check if someone is on the list. It's free to check online. Plus, you get 100 free requests every month if you need to integrate the API into your own app.

You can start with the Nannostomus sex offender data API provider. It includes data from all U.S. states, offers pay-as-you-go pricing, and gives you 100 requests per month free. You can test real responses, monitor stats, and upgrade anytime without long-term commitments or setup fees.

Pricing is pay-as-you-go. You pay only for the number of API requests you make each month. Plans for sex offender API cost per call start at just a few cents per call, with the first 100 requests free. There are no setup fees, hidden charges, or minimum commitments.

You get 100 free requests each month. After that, pricing is tiered—each block of requests has its own rate. Your bill is the sum of all used tiers. For example, if you make 8,543 requests, you pay for 101–300 at $0.15, 301–3,000 at $0.10, and 3,001–10,000 at $0.05.

Create an account on our self-service platform and add your Visa or MasterCard. After that, you can generate your API token and get full access to the API. The first 100 requests are free, so you can test the service before any charges apply.

Yes. You can cancel your plan anytime through your self-service dashboard. There are no long-term contracts, and you’re only charged for requests made before cancellation. All invoices remain available for download in your account.

Our team provides direct support for both free and paid users of API to search sex offender registry. You’ll find developer-friendly documentation, email assistance, and fast responses to technical issues. We also share regular update reports, so you always know when new data is loaded.

Each month, we collect data from every state’s official registry. The dataset powering our API reflects the latest information available from those sources. You’ll also get a report file showing update status, record counts, and source URLs for each state for transparency.

Right now, we deduplicate records within each state. So, no offender appears twice in the same state. We’re working on a cross-state entity resolution feature that will merge duplicates across states so one offender has a single unified profile nationwide.

We rely on official state registries for this information in our sexual offender search API. If a state marks an offender as absconded or removes them due to death, the change is reflected in our next monthly update. We don’t alter or manage these records independently of state data.