Choose dataset-only, fallback or always AI mode in GenderAPI v2. Understand nickname inference, per-item batch defaults and the exact credit tariffs.
AI modes and forceToGenderize
In POST bodies, set options: {"ai_mode": "off"} (or fallback / always). In GET URLs, use ai_mode=off. Batch items default to off; enable fallback separately on each item that needs it.
When forceToGenderize is true, omit ai_mode or use fallback. Combining it with off or always returns 422. Ordinary AI inference requires a usable real given name; forced inference can use an alias. Neither mode guarantees a non-null gender.
A dataset or provider error is a failed request, not a dataset miss. Failed predictions are refunded; inspect billing_status before retrying when the billing outcome cannot be confirmed.
Mode
Behavior
Total credits per successful item
off
Dataset only; no AI call.
1, including an unknown result
fallback
Dataset first, then AI if gender is unresolved. Default for single requests.
1, including AI fallback
always
Skip the dataset and ask AI directly.
2
forceToGenderize: true
Dataset first, then nickname-aware AI if unresolved. Works for name, email and username.
1 for a resolved dataset result; 2 total if AI is used
Enable nickname-aware inference
The same optional forceToGenderize field works with type name, email and username. This example uses a nickname as a name value. Use your existing Bearer API key. Unknown outcomes remain valid results.
Choose your language.Set up your API key, then run the example on your server.
Every prediction request is a new billable operation, including retries. These examples do not automatically retry. Check billing status before sending another request.
Before you run: access and error handling
Run these examples on your server. Set GENDERAPI_API_KEY in the process environment to your existing API key. Confirm meta.access.mode is api_key: an unrecognized key can fall back to the IP trial.
HTTP 4xx and 5xx JSON responses preserve the error body and return a nonzero exit status. Check code, action and meta.usage.billing_status before retrying.
// Server-side Node.js. Save as example.mjs.const apiKey = process.env.GENDERAPI_API_KEY;if (!apiKey) throw new Error("Set GENDERAPI_API_KEY");const body = { "type": "name", "value": "prenses", "country": "TR", "forceToGenderize": true};const response = await fetch("https://api.genderapi.io/api/v2/gender", { method: "POST", headers: { Authorization: `Bearer ${apiKey}`, "Content-Type": "application/json", }, body: JSON.stringify(body), signal: AbortSignal.timeout(30_000), redirect: "error",});const raw = await response.text();if (!(response.headers.get("content-type") ?? "").includes("json")) { throw new Error(`HTTP ${response.status}: expected JSON; request ID ${response.headers.get("x-request-id")}`);}const result = JSON.parse(raw); // Also accepts application/problem+json.if (!response.ok) { console.error(`HTTP ${response.status}`, result); process.exitCode = 1; // A retry is a new operation; inspect billing first.} else { console.log(JSON.stringify(result, null, 2)); // For batches, inspect every item: HTTP 200 may contain item errors.}
Node.js 22+; built-in fetch. Save as example.mjs and run node example.mjs. Runtime documentation
Python
import jsonimport osimport sysimport urllib.errorimport urllib.requestapi_key = os.environ.get("GENDERAPI_API_KEY")if not api_key: raise RuntimeError("Set GENDERAPI_API_KEY")body = json.loads("{\"type\":\"name\",\"value\":\"prenses\",\"country\":\"TR\",\"forceToGenderize\":true}")class NoRedirect(urllib.request.HTTPRedirectHandler): def redirect_request(self, req, fp, code, msg, headers, newurl): return Nonerequest = urllib.request.Request( "https://api.genderapi.io/api/v2/gender", method="POST", data=json.dumps(body).encode("utf-8"), headers={ "Authorization": "Bearer " + api_key, "Content-Type": "application/json", },)opener = urllib.request.build_opener(NoRedirect())try: response = opener.open(request, timeout=30)except urllib.error.HTTPError as error: response = error # Keep the Problem Details body on non-2xx responses.with response: status = response.status raw = response.read().decode("utf-8") if "json" not in response.headers.get("Content-Type", ""): raise RuntimeError(f"HTTP {status}: expected a JSON response") result = json.loads(raw)print(json.dumps(result, indent=2), file=sys.stderr if status >= 300 else sys.stdout)if not 200 <= status < 300: sys.exit(1) # Inspect code, action and billing before retrying.# For batches, inspect every item even when HTTP status is 200.
Python 3.10+; standard library. Save as example.py and run python3 example.py. Runtime documentation
PHP 8+ with the cURL extension. Save as example.php and run php example.php. Runtime documentation
Java
import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.nio.charset.StandardCharsets;import java.time.Duration;public class GenderApiExample { private static String requiredEnv(String name) { String value = System.getenv(name); if (value == null || value.isBlank()) throw new IllegalStateException("Set " + name); return value; } public static void main(String[] args) throws Exception { String apiKey = requiredEnv("GENDERAPI_API_KEY"); String body = "{\"type\":\"name\",\"value\":\"prenses\",\"country\":\"TR\",\"forceToGenderize\":true}"; HttpClient client = HttpClient.newBuilder() .connectTimeout(Duration.ofSeconds(10)) .followRedirects(HttpClient.Redirect.NEVER) .build(); HttpRequest request = HttpRequest.newBuilder(URI.create("https://api.genderapi.io/api/v2/gender")) .timeout(Duration.ofSeconds(30)) .header("Authorization", "Bearer " + apiKey) .header("Content-Type", "application/json") .POST(HttpRequest.BodyPublishers.ofString(body, StandardCharsets.UTF_8)) .build(); HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString(StandardCharsets.UTF_8)); if (!response.headers().firstValue("content-type").orElse("").contains("json")) { throw new IllegalStateException("HTTP " + response.statusCode() + ": expected JSON"); } // JSON text; parse with your application's JSON library when integrating. if (response.statusCode() < 200 || response.statusCode() >= 300) { System.err.println(response.body()); // Includes Problem Details. System.exit(1); } System.out.println(response.body()); // For batches, inspect each item's data or error, including on HTTP 200. }}
Java 17+; standard HTTP client. Save as GenderApiExample.java and run java GenderApiExample.java. Runtime documentation
C# / .NET
using System;using System.Net.Http;using System.Net.Http.Headers;using System.Text;using System.Text.Json;string RequiredEnv(string name) => !string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable(name)) ? Environment.GetEnvironmentVariable(name)! : throw new InvalidOperationException($"Set {name}");var apiKey = RequiredEnv("GENDERAPI_API_KEY");using var handler = new HttpClientHandler { AllowAutoRedirect = false };using var client = new HttpClient(handler) { Timeout = TimeSpan.FromSeconds(30) };using var request = new HttpRequestMessage(HttpMethod.Post, "https://api.genderapi.io/api/v2/gender");request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);request.Content = new StringContent("{\"type\":\"name\",\"value\":\"prenses\",\"country\":\"TR\",\"forceToGenderize\":true}", Encoding.UTF8, "application/json");using var response = await client.SendAsync(request);var raw = await response.Content.ReadAsStringAsync();if (!(response.Content.Headers.ContentType?.MediaType?.Contains("json") ?? false)) throw new InvalidOperationException($"HTTP {(int)response.StatusCode}: expected JSON");using var result = JsonDocument.Parse(raw);if (!response.IsSuccessStatusCode){ Console.Error.WriteLine(result.RootElement); // Preserve Problem Details. Environment.ExitCode = 1;}else{ Console.WriteLine(result.RootElement); // For batches, inspect every item even on HTTP 200.}
.NET 8+ console application. Use as Program.cs in a console project, then run dotnet run. Runtime documentation
Go
package mainimport ( "encoding/json" "fmt" "io" "net/http" "os" "strings" "time")func requiredEnv(name string) string { value := os.Getenv(name) if value == "" { panic("Set " + name) } return value}func run() error { apiKey := requiredEnv("GENDERAPI_API_KEY") body := "{\"type\":\"name\",\"value\":\"prenses\",\"country\":\"TR\",\"forceToGenderize\":true}" request, err := http.NewRequest("POST", "https://api.genderapi.io/api/v2/gender", strings.NewReader(body)) if err != nil { return err } request.Header.Set("Authorization", "Bearer " + apiKey) request.Header.Set("Content-Type", "application/json") client := &http.Client{ Timeout: 30 * time.Second, CheckRedirect: func(req *http.Request, via []*http.Request) error { return http.ErrUseLastResponse }, } response, err := client.Do(request) if err != nil { return err } defer response.Body.Close() raw, err := io.ReadAll(response.Body) if err != nil { return err } if !strings.Contains(response.Header.Get("Content-Type"), "json") || !json.Valid(raw) { return fmt.Errorf("HTTP %d: expected a JSON response", response.StatusCode) } if response.StatusCode < 200 || response.StatusCode >= 300 { return fmt.Errorf("HTTP %d: %s", response.StatusCode, raw) } fmt.Println(string(raw)) // For batches, inspect every item even on HTTP 200. return nil}func main() { if err := run(); err != nil { fmt.Fprintln(os.Stderr, err) // Keep Problem Details for error handling. os.Exit(1) }}
Go 1.22+; standard library. Save as main.go and run go run main.go. Runtime documentation