Gender API

Gender prediction in one API call

Send a name, get back the most likely gender with a probability and the number of records behind it. Batch up to 100 names per request and scope predictions by country.

Get a free API key API reference

2,500 names a month free
No credit card
8 official SDKs

GET

curl "https://api.genderize.io?name=peter&apikey=YOUR_API_KEY"

Response · 200 OK

{
  "name": "peter",
  "gender": "male",
  "probability": 1.0,
  "count": 1352696
}

Trusted by leading organizations

99.999% uptime
GDPR compliant
EU-based company
Since 2009

Built for developers

Everything you need in one endpoint

Plain GET requests, JSON responses and a key that works from any language. Most integrations take minutes.

One GET request

One endpoint and one query parameter. No SDK required, though we have them.

Batches of up to 100

Send repeated name[] parameters and get an array back in the same order.

Localization

Add a two-letter country_id to scope the prediction to one country.

Full names, any alphabet

Send full names as they are. Diacritics and non-Latin alphabets are supported.

Confidence you can threshold

Every result carries a probability and the number of records behind it.

Rate-limit headers

Every response reports your limit, what's left and when the window resets.

Official client libraries for eight languages

Install the official Demografix package for your stack. Each library wraps all three name analysis APIs behind one API key, so you can integrate gender, age, and nationality without writing a client.

Python
Node
Go
PHP
Ruby
Rust
Elixir
C#

Browse 8 libraries

Use cases

What teams build with it

Most integrations enrich records in bulk, then report on the group as a whole.

Analytics and dashboards

Add a gender column in your pipeline or warehouse and report the split of users, customers or leads.

Research at scale

Classify thousands of authors, inventors or grantees to measure representation across a field.

Media monitoring

Measure who gets quoted and who writes across thousands of articles.

AI assistants

Connect the same key to Claude, ChatGPT or Cursor through our hosted MCP server and ask aggregate questions in plain language.

MCP docs

Pricing and limits

Simple, predictable limits

Over your limit, requests return 429 until the period resets. We never charge overage fees.
Rate-limit headers on every response show what's left.
One key works for Genderize, Agify and Nationalize.

Free plan

2,500 names a month

Paid plans cover higher volumes. Upgrades take effect immediately and you can cancel any time.

See pricing

Used in published research worldwide

Journalists, academics, and developers have used our APIs to analyze millions of records. Here are some of their stories.

All case studies

Frequently asked questions

How do I get an API key?: Create a free account and your key is waiting in your account dashboard. Pass it as the apikey query parameter.
How many names can I send per request?: Up to 100, using repeated name[] parameters. The response is an array in the same order as your input.
How is usage counted?: Every name you send counts against your monthly quota, including each name in a batch. A batch of 100 names uses 100.
What happens when I reach my limit?: Requests return 429 until your quota resets. There are no overage fees, and upgrades take effect immediately.
How accurate is it?: Every result includes a probability and the number of records behind it, so you decide how to treat uncertain names. Predictions describe name statistics, not individuals, so they are most reliable across many names. We publish open benchmarks .
Do you have SDKs?: Yes, official libraries for 8 languages , all using the same key. Or call the endpoint directly: it's a single GET request.

Start with a free API key

Your key is ready in seconds, and the first 2,500 names every month are free.

Get a free API key Read the API reference