REST API Reference

curl "https://namegender.com/api/v1/gender?name=Ay%C5%9Fe&country=TR" \
  -H "Authorization: Bearer YOUR_API_KEY"

<?php

$query = http_build_query(['name' => 'Ayşe', 'country' => 'TR']);

$ch = curl_init('https://namegender.com/api/v1/gender?' . $query);
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
]);

$result = json_decode(curl_exec($ch), true);

echo $result['gender'];       // female
echo $result['probability'];  // 100

const params = new URLSearchParams({ name: 'Ayşe', country: 'TR' });

const response = await fetch(`https://namegender.com/api/v1/gender?${params}`, {
  headers: { Authorization: 'Bearer YOUR_API_KEY' },
});

const result = await response.json();

console.log(result.gender);       // "female"
console.log(result.probability);  // 100

import requests

response = requests.get(
    "https://namegender.com/api/v1/gender",
    params={"name": "Ayşe", "country": "TR"},
    headers={"Authorization": "Bearer YOUR_API_KEY"},
)

result = response.json()
print(result["gender"])       # female
print(result["probability"])  # 100

require "net/http"
require "json"

uri = URI("https://namegender.com/api/v1/gender")
uri.query = URI.encode_www_form(name: "Ayşe", country: "TR")

request = Net::HTTP::Get.new(uri)
request["Authorization"] = "Bearer YOUR_API_KEY"

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)["gender"]   # female

req, _ := http.NewRequest("GET", "https://namegender.com/api/v1/gender?name=Ay%C5%9Fe&country=TR", nil)
req.Header.Set("Authorization", "Bearer YOUR_API_KEY")

resp, err := http.DefaultClient.Do(req)
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()

var result struct {
    Gender      string `json:"gender"`
    Probability int    `json:"probability"`
}
json.NewDecoder(resp.Body).Decode(&result)

fmt.Println(result.Gender)   // female

curl "https://namegender.com/api/v1/gender?name=Jordan" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "credits_charged": 1,
  "credits_remaining": 49999,
  "request_id": "req_4b7e0c2d9a1f6358",
  "query": "Jordan",
  "name": "Jordan",
  "first_name": "Jordan",
  "middle_name": null,
  "last_name": null,
  "name_type": "personal",
  "gender": "male",
  "country": null,
  "sample_size": 62240,
  "probability": 84,
  "took_ms": 1,
  "confidence": "high",
  "source": "db",
  "matched_as": null
}

curl "https://namegender.com/api/v1/gender/email?email=ayse.yilmaz84%40example.com" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "credits_charged": 1,
  "credits_remaining": 49998,
  "query": "ayse.yilmaz84@example.com",
  "name": "Ayse",
  "gender": "female",
  "sample_size": 655,
  "probability": 100,
  "took_ms": 1,
  "confidence": "high",
  "source": "db"
}

curl "https://namegender.com/api/v1/gender/username?username=AyseYilmaz84" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "credits_charged": 1,
  "credits_remaining": 49997,
  "query": "AyseYilmaz84",
  "name": "Ayse",
  "gender": "female",
  "sample_size": 655,
  "probability": 100,
  "took_ms": 1,
  "confidence": "high",
  "source": "db"
}

curl -X POST "https://namegender.com/api/v1/gender/bulk" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"names": ["Ayşe", "Mehmet", "Priya", "Wei"]}'

<?php

$ch = curl_init('https://namegender.com/api/v1/gender/bulk');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST           => true,
    CURLOPT_HTTPHEADER     => [
        'Authorization: Bearer YOUR_API_KEY',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'names' => ['Ayşe', 'Mehmet', 'Priya', 'Wei'],
    ]),
]);

$data = json_decode(curl_exec($ch), true);

foreach ($data['results'] as $row) {
    printf("%-8s %-7s %d%%\n", $row['query'], $row['gender'] ?? '?', $row['probability']);
}

const response = await fetch('https://namegender.com/api/v1/gender/bulk', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ names: ['Ayşe', 'Mehmet', 'Priya', 'Wei'] }),
});

const { results, summary } = await response.json();

console.log(summary.match_rate);   // 100
results.forEach(r => console.log(r.query, r.gender, r.probability));

import requests

response = requests.post(
    "https://namegender.com/api/v1/gender/bulk",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={"names": ["Ayşe", "Mehmet", "Priya", "Wei"]},
)

data = response.json()
print(data["summary"]["match_rate"])   # 100

for row in data["results"]:
    print(row["query"], row["gender"], row["probability"])

{
  "credits_charged": 4,
  "credits_remaining": 49995,
  "request_id": "req_71d0a9e3c5b24f86",
  "took_ms": 2,
  "summary": {
    "total": 4,
    "identified": 4,
    "unknown": 0,
    "match_rate": 100
  },
  "results": [
    { "query": "Ayşe",   "gender": "female", "probability": 100, "sample_size":  655, "confidence": "high", "source": "db" },
    { "query": "Mehmet", "gender": "male",   "probability": 100, "sample_size": 1130, "confidence": "high", "source": "db" },
    { "query": "Priya",  "gender": "female", "probability": 100, "sample_size": 2993, "confidence": "high", "source": "db" },
    { "query": "Wei",    "gender": "male",   "probability":  86, "sample_size":  136, "confidence": "high", "source": "db" }
  ]
}

# 1. Upload and start
curl -X POST "https://namegender.com/api/v1/batches" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Idempotency-Key: 6f1c2e0a-customers-2026-09" \
  -F "file=@customers.csv" \
  -F "name_column=first_name" \
  -F "country_column=country"

# 2. Poll until status is completed or failed
curl "https://namegender.com/api/v1/batches/B-7K2M9QX4TA" \
  -H "Authorization: Bearer YOUR_API_KEY"

# 3. Download the result
curl "https://namegender.com/api/v1/batches/B-7K2M9QX4TA/result" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -o customers-gender.csv

import { NameGender } from 'namegender';
import { openAsBlob } from 'node:fs';
import { writeFile } from 'node:fs/promises';

const client = new NameGender(process.env.NAMEGENDER_API_KEY);

const job = await client.batches.create(await openAsBlob('customers.csv'), {
  filename: 'customers.csv',
  name_column: 'first_name',
  country_column: 'country',
});

const done = await client.batches.wait(job.id);
if (done.status === 'failed') throw new Error(done.error.code);

const file = await client.batches.download(done.id);
await writeFile('customers-gender.csv', Buffer.from(await file.arrayBuffer()));

from namegender import NameGender

client = NameGender("YOUR_API_KEY")

job = client.batches.create("customers.csv", name_column="first_name", country_column="country")

done = client.batches.wait(job["id"])
if done["status"] == "failed":
    raise RuntimeError(done["error"]["code"])

client.batches.download(done["id"], "customers-gender.csv")

{
  "id": "B-7K2M9QX4TA",
  "status": "completed",
  "source": "api",
  "file": { "name": "customers.csv", "format": "csv" },
  "columns": { "name": "first_name", "country": "country" },
  "rows": { "total": 200000, "processed": 200000, "identified": 187412 },
  "progress": 100,
  "credits": { "reserved": 200000, "charged": 200000 },
  "summary": { "male": 96120, "female": 91292, "unknown": 12588, "from_llm": 0 },
  "error": null,
  "result": {
    "url": "https://namegender.com/api/v1/batches/B-7K2M9QX4TA/result",
    "format": "csv",
    "expires_at": "2026-10-01T10:04:12Z"
  },
  "poll_after_seconds": null
}

import express from 'express';
import { webhooks, NameGenderWebhookError } from 'namegender';

const app = express();

// express.raw, not express.json: the signature covers the exact bytes.
app.post('/namegender', express.raw({ type: 'application/json' }), async (req, res) => {
  let event;
  try {
    event = await webhooks.verify(
      req.body,
      req.get('NameGender-Signature'),
      process.env.NAMEGENDER_WEBHOOK_SECRET,
    );
  } catch (error) {
    if (error instanceof NameGenderWebhookError) return res.sendStatus(400);
    throw error;
  }

  res.sendStatus(204);   // answer first, then do the work

  if (event.type === 'batch.completed') {
    const job = event.data.object;   // same object as GET /batches/{id}
  }
});

import os
from flask import Flask, request
from namegender import webhooks, WebhookVerificationError

app = Flask(__name__)

@app.post("/namegender")
def namegender_webhook():
    try:
        event = webhooks.verify(
            request.get_data(),   # raw bytes, not request.json
            request.headers.get("NameGender-Signature"),
            os.environ["NAMEGENDER_WEBHOOK_SECRET"],
        )
    except WebhookVerificationError:
        return "", 400

    if event["type"] == "batch.completed":
        job = event["data"]["object"]   # same object as GET /batches/{id}
    return "", 204

<?php

$body   = file_get_contents('php://input');   // raw body, before json_decode
$header = $_SERVER['HTTP_NAMEGENDER_SIGNATURE'] ?? '';
$secret = getenv('NAMEGENDER_WEBHOOK_SECRET');

parse_str(str_replace(',', '&', $header), $parts);   // t=…&v1=…
preg_match_all('/v1=([0-9a-f]{64})/', $header, $m);

$t = (int) ($parts['t'] ?? 0);
$expected = hash_hmac('sha256', $t . '.' . $body, $secret);
$valid = abs(time() - $t) <= 300
    && array_filter($m[1], fn ($sig) => hash_equals($expected, $sig));

if (! $valid) {
    http_response_code(400);
    exit;
}

http_response_code(204);
$event = json_decode($body, true);

{
  "id": "evt_16f7c01502fda5436e8b7c4e",
  "type": "batch.completed",
  "created_at": "2026-09-24T10:04:12Z",
  "api_version": "v1",
  "data": {
    "object": {
      "id": "B-7K2M9QX4TA",
      "status": "completed",
      "rows": { "total": 200000, "processed": 200000, "identified": 187412 },
      "credits": { "reserved": 200000, "charged": 200000 },
      "result": { "url": "…/api/v1/batches/B-7K2M9QX4TA/result", "format": "csv" }
    }
  }
}

curl "https://namegender.com/api/v1/gender/countries?name=Mehmet" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "credits_charged": 1,
  "credits_remaining": 49994,
  "took_ms": 3,
  "name": "Mehmet",
  "basis": {
    "counted_sources": ["ssa", "ons", "nrs", "nisra", "insee", "statcan", "ine", "cso", "ssb", "statat", "pesel", "bfs"],
    "counted_countries": 8,
    "attested_countries": 16,
    "note": "Shares are calculated only across countries that publish counted name statistics…"
  },
  "registrations": [
    { "country": "CH", "count": 3890, "share": 29.45, "gender": "male", "source": "bfs"    },
    { "country": "FR", "count": 3775, "share": 28.58, "gender": "male", "source": "insee"  },
    { "country": "PL", "count": 1808, "share": 13.69, "gender": "male", "source": "pesel"  }
  ],
  "attested_in": ["AL","AT","AU","BE","CA","CH","ES","FR","GB","KS","MK","NO","PL","SE","TR","US"]
}

curl -X POST "https://namegender.com/api/v1/salutation" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name": "Dr. Anna Müller", "language": "de"}'

{
  "credits_charged": 1,
  "credits_remaining": 49993,
  "language": "de",
  "form": "gendered",
  "reason": null,
  "salutation": {
    "formal": "Sehr geehrte Frau Dr. Müller,",
    "informal": "Liebe Anna,",
    "neutral": "Guten Tag Dr. Anna Müller,"
  },
  "parts": { "opening": "Sehr geehrte", "courtesy": "Frau", "academic": "Dr.", "name": "Müller" },
  "gender": "female",
  "gender_source": "lookup",
  "probability": 99,
  "first_name": "Anna",
  "last_name": "Müller",
  "name_type": "personal"
}

curl -X POST "https://namegender.com/api/v1/name-check" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name": "asdf qwerty"}'

{
  "credits_charged": 1,
  "credits_remaining": 49992,
  "query": "asdf qwerty",
  "assessment": "implausible",
  "score": 0,
  "signals": [
    { "code": "placeholder", "severity": "high", "part": "first_name", "value": "asdf" },
    { "code": "keyboard_pattern", "severity": "high", "part": "first_name", "value": "asdf" },
    { "code": "keyboard_pattern", "severity": "high", "part": "last_name", "value": "qwerty" }
  ],
  "first_name": "Asdf",
  "last_name": "Qwerty",
  "name_type": "personal",
  "evidence": { "first_name_status": "not_found", "first_name_counted_records": 0 }
}

curl "https://namegender.com/api/v1/age?name=Brittany" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "credits_charged": 1,
  "credits_remaining": 49991,
  "request_id": "req_8f2c1a",
  "name": "Brittany",
  "first_name": "Brittany",
  "gender": null,
  "age": 36,
  "age_range": { "low": 32, "high": 38 },
  "age_range_80": { "low": 28, "high": 41 },
  "birth_year": 1990,
  "sample_size": 353775,
  "births": 361434,
  "country": "US",
  "country_source": "default",
  "source": "ssa",
  "series": "1880-2024",
  "reference_year": 2026,
  "reason": null
}

curl "https://namegender.com/api/v1/me" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "email": "you@example.com",
  "credits_remaining": 50099,
  "purchased_credits": 50000,
  "free_today": 99,
  "free_daily_limit": 100,
  "lifetime_requests": 12480
}