Nationalize.io

Free REST API that predicts the nationality of a person based on their first name using probabilistic models derived from a dataset of approximately one billion people spanning 250 countries and territories. Accepts single or batched names, handles diacritics and non-Latin alphabets, and returns ranked country probabilities as JSON. The same API key works across all three Demografix services (Genderize, Agify, Nationalize).

Nationalize.io publishes 1 API on the APIs.io network: Nationality API. Tagged areas include Nationality, Name Prediction, Demographics, Probabilistic Models, and People.

The Nationalize.io catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Nationalize.io’s developer surface includes authentication, documentation, pricing, FAQ, signup flow, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.7/100 developing ▬ flat Agent 35/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

NationalityName PredictionDemographicsProbabilistic ModelsPeople

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 46.7/100 · developing

Contract Quality 14.8 / 25

Developer Ergonomics 4.3 / 20

Access Clarity 15.5 / 20

Operational Transparency 4.1 / 13

Contract Governance 1.2 / 12

Discoverability 6.9 / 10

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/nationalize: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Nationalize.io Nationality API

Operations for predicting nationality from names

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Nationalize.io Nationality API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Nationalize Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Nationalize Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Nationalize Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Nationalize Context

2 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Nationalize.io API Rules

4 rules · 3 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

NationalityResult

3 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Batch Name Lookup

3 fields

EXAMPLE

Name Not Found

3 fields

EXAMPLE

Single Name Lookup

3 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Nationalize Authentication

apiKey · 1 scheme

SECURITY

Nationalize Domain Security

TLSv1.2 · DNSSEC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Nationalize Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

FAQ

FAQ

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: nationalize
name: Nationalize.io
description: Free REST API that predicts the nationality of a person based on their first name using probabilistic models
  derived from a dataset of approximately one billion people spanning 250 countries and territories. Accepts single or batched
  names, handles diacritics and non-Latin alphabets, and returns ranked country probabilities as JSON. The same API key works
  across all three Demografix services (Genderize, Agify, Nationalize).
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nationalize.png
url: https://raw.githubusercontent.com/api-evangelist/nationalize/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Nationality
- Name Prediction
- Demographics
- Probabilistic Models
- People
apis:
- aid: nationalize:nationalize-nationality-api
  name: Nationalize.io Nationality API
  description: Operations for predicting nationality from names
  humanURL: https://nationalize.io/documentation
  baseURL: https://api.nationalize.io
  tags:
  - Nationality
  properties:
  - type: OpenAPI
    url: openapi/nationalize-nationality-api-openapi.yml
  - type: Documentation
    url: https://nationalize.io/documentation
  - type: Pricing
    url: https://nationalize.io/pricing
common:
- type: AgenticAccess
  url: agentic-access/nationalize-agentic-access.yml
- type: DomainSecurity
  url: security/nationalize-domain-security.yml
- type: Authentication
  url: authentication/nationalize-authentication.yml
- type: Website
  url: https://nationalize.io
- type: Documentation
  url: https://nationalize.io/documentation
- type: Pricing
  url: https://nationalize.io/pricing
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/nationalize/refs/heads/main/plans/nationalize-plans-pricing.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/nationalize/refs/heads/main/rate-limits/nationalize-rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/nationalize/refs/heads/main/finops/nationalize-finops.yml
- type: TermsOfService
  url: https://nationalize.io/legal/terms-and-conditions
- type: PrivacyPolicy
  url: https://nationalize.io/legal/privacy-policy
- type: FAQ
  url: https://nationalize.io/faq
- type: Login
  url: https://nationalize.io/login
- type: Signup
  url: https://nationalize.io/register
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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