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Nationalize.io API

The Nationalize.io API enables developers to predict nationalities based on first names, delivering demographic insights through JSON responses. Free tier supports 1,000 requests daily.

Developed by Nationalize.io

Live API
99.90%Uptime
150msLatency
0Stars
No AuthAuth
NoCredit Card
RESTStyle
1.0Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Predicts nationality from a name using query parameter ?name=michael

Endpoint URL
https://api.nationalize.io/
Code Example
curl -X GET 'https://api.nationalize.io/'
Request Payload
{
  "name": "michael"
}
Expected Response
{
  "name": "michael",
  "count": 195070,
  "country": [
    {
      "country_id": "US",
      "probability": 0.45
    }
  ]
}
Version:v1
Limit:1000 requests/day

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://api.nationalize.io/api/v1/predict?name=John"

Docs

Technical Documentation

What this API does

The Nationalize.io API provides a method to predict a person's nationality by analyzing their first name. Developers receive a ranked list of country codes, each associated with a probability score, facilitating demographic insights and user profiling.

How it works

Using a simple HTTP GET request, developers can send one or multiple first names to the API and receive a JSON-formatted response that includes country codes and respective probabilities. This makes integration straightforward for applications requiring user nationality data.

Authentication

The API requires an API key for authentication. Developers can obtain this key upon registration at the Nationalize.io official website. This key must be included in every request to access the service.

Example usage

  • GET https://nationalize.io/?name=michael - Retrieves nationality predictions for the name 'Michael'.
  • GET https://nationalize.io/?name=michael,john - Fetches predictions for multiple names in a single request.

Limits

The Nationalize.io API allows up to 1,000 free requests per day for each API key. Additional requests may require upgrading to a paid plan, details of which can be found on the official website.

Ideal use cases

  • Enhancing user profiles by predicting nationalities based on names.
  • Targeting marketing campaigns more effectively through demographic analysis.
  • Improving app personalization by tailoring content to predicted nationalities.
  • Conducting cultural studies or analytics based on user data.

Examples

Real-World Applications

  • Enhancing user profiles in applications based on nationality predictions.
  • Implementing targeted marketing strategies by understanding user demographics.
  • Conducting demographic analytics for research or data analysis projects.
  • Integrating nationality prediction functionality into social media or networking platforms.

Evaluation

Advantages & Limitations

Advantages
  • ✓ Simple REST API with easy to understand JSON responses.
  • ✓ No authentication required for immediate use.
  • ✓ Supports batch lookups for bulk processing.
  • ✓ Companion API to Genderize.io offering demographic insights.
Limitations
  • ✗ Limited to first-name based nationality prediction which may not always be accurate.
  • ✗ No advanced authentication or security features.
  • ✗ No official SDKs available.
  • ✗ Limited documentation on rate limiting and usage quotas.

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

1.0
Pricing Model
Freemium with paid plans for higher usage
Credit Card
Not Required
Response Formats
JSON
Supported Languages
7 Languages
SDK Support
REST Only
Rate Limit

1000 requests per day

Time to Hello World

Less than 5 minutes

Free Tier

Allows up to 1,000 free requests per day with no API key or credit card required.

Best For

Developers needing quick nationality prediction from first names with minimal setup.

Not Ideal For

Applications requiring highly accurate or multi-factor identity verification.

Tags

#name-prediction#nationalize#enrichment#free-api#analytics#nationality

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