Genderize.io Getting Started: Quickstart Guide (2026)

Getting started overview

To begin using the Genderize.io API, developers follow a standard sequence: account registration, API key retrieval, and sending a request to the API endpoint. The Genderize.io API is designed for straightforward integration, operating primarily through GET requests that include a first name and an API key as query parameters. Successful requests return a JSON object containing the predicted gender, probability, and count based on the name provided.

The API offers a free tier supporting up to 1,000 requests per day, making it accessible for initial testing and small-scale applications. Paid plans provide increased request limits and additional features. The overall process involves obtaining credentials from the Genderize.io dashboard and then constructing a simple HTTP request, as detailed in the Genderize.io API reference.

Here's a quick reference for the setup process:

Create an account and get keys

Access to the Genderize.io API requires an API key, which is obtained after registering an account. This key authenticates your requests and tracks your usage against your plan limits. The process is as follows:

1. Navigate to the Genderize.io website: Open your web browser and go to the Genderize.io homepage.
2. Sign up for an account: Look for a 'Sign Up' or 'Get API Key' button and follow the registration prompts. This typically involves providing an email address and creating a password.
3. Verify your email (if required): Some registration processes include an email verification step to confirm your account.
4. Access your dashboard: Once registered and logged in, you will be directed to your Genderize.io dashboard.
5. Locate your API key: Within the dashboard, your unique API key should be prominently displayed. It is usually labeled 'Your API Key' or similar. Copy this key, as it will be used in every API request you make. The Genderize.io documentation provides further details on managing your API keys.

It is recommended to store your API key securely and avoid exposing it in client-side code or public repositories. Environment variables or secure configuration management tools are typical methods for handling API keys in production applications, as outlined in general API key security best practices from Google Cloud.

Your first request

After obtaining an API key, you can make your first request to the Genderize.io API. The API uses a simple GET request format. Here's how to structure a basic request and interpret the response, using cURL and Python as examples.

API Endpoint

The base URL for the Genderize.io API is https://api.genderize.io.

Request Parameters

• name (required): The first name to predict the gender for.
• apikey (required): Your unique API key.
• country_id (optional): An ISO 3166-1 alpha-2 country code to improve prediction accuracy for specific regions.
• language_id (optional): An ISO 639-1 alpha-2 language code for language-specific predictions.

Example using cURL

Replace YOUR_API_KEY with your actual API key and peter with the name you wish to query.

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

Example using Python

This Python example uses the requests library, a common choice for making HTTP requests in Python applications.

import requests

api_key = "YOUR_API_KEY"  # Replace with your actual API key
name_to_check = "peter"

url = f"https://api.genderize.io?name={name_to_check}&apikey={api_key}"

try:
    response = requests.get(url)
    response.raise_for_status()  # Raise an exception for HTTP errors (4xx or 5xx)
    data = response.json()
    print(data)
except requests.exceptions.RequestException as e:
    print(f"An error occurred: {e}")

Expected Response

A successful request will return a JSON object similar to this, describing the predicted gender, probability, and the count of names used for the prediction:

{
  "name": "peter",
  "gender": "male",
  "probability": 1.0,
  "count": 12345,
  "country_id": null
}

• name: The name that was queried.
• gender: The predicted gender (e.g., "male", "female").
• probability: A floating-point number between 0 and 1 indicating the confidence of the prediction. A value of 1.0 means 100% probability.
• count: The number of times the name was observed in Genderize.io's dataset.
• country_id: The country ID if provided in the request or inferred.

Common next steps

Once you've successfully made your first API call, you can explore more advanced features and integrations:

• Batch Requests: The Genderize.io API supports processing multiple names in a single request, which can reduce the number of API calls and improve efficiency. Consult the Genderize.io API reference documentation for details on constructing batch requests.
• Country and Language Specificity: Enhance prediction accuracy by providing country_id and language_id parameters. This is particularly useful for names that are common across multiple regions but have different gender distributions.
• Error Handling: Implement robust error handling in your application to gracefully manage API rate limits, invalid API keys, or malformed requests. The API returns standard HTTP status codes and error messages in JSON format.
• SDK Integration: For developers using Python, Ruby, PHP, JavaScript, Java, or Go, consider using one of the official Genderize.io SDKs. SDKs can streamline API interaction by abstracting HTTP requests and JSON parsing.
• Monitoring and Analytics: Integrate monitoring tools to track API usage, response times, and error rates. This helps in understanding application performance and managing API quota effectively.
• Upgrade Plan: If your application requires more than 1,000 requests per day, review the Genderize.io pricing page to select a paid plan that aligns with your usage needs.

Troubleshooting the first call

When making your initial API call, you might encounter issues. Here are common problems and troubleshooting steps:

• Invalid API Key: Ensure your apikey parameter is correctly specified and matches the key from your Genderize.io dashboard. An incorrect key will typically result in an authentication error (e.g., HTTP 401 Unauthorized). Double-check for typos or leading/trailing spaces.
• Missing Name Parameter: The name parameter is mandatory. If it's omitted or empty, the API will return an error indicating a missing required parameter (e.g., HTTP 400 Bad Request).
• Rate Limit Exceeded: If you're on the free tier or a paid plan, exceeding your daily or monthly request limit will result in an HTTP 429 Too Many Requests error. Check your dashboard for current usage and consider upgrading your plan or implementing rate limiting in your application.
• Network Issues: Verify your internet connection and ensure there are no firewalls or proxies blocking access to api.genderize.io. Test connectivity using a simple cURL command to a known working URL.
• Incorrect Endpoint: Confirm that you are sending requests to the correct API endpoint: https://api.genderize.io.
• JSON Parsing Errors: If your application fails to parse the JSON response, ensure your code correctly handles the expected JSON structure. Use a JSON linter or validator to confirm the API response is valid JSON.
• Checking Documentation: Refer to the Genderize.io official documentation for specific error codes and their meanings. The documentation provides comprehensive details on expected inputs and outputs.