Genderize.io
genderize.ioA REST API that predicts a person's likely gender from their first name, returning a probability score and the number of data points behind the prediction.
The Genderize.io API uses api key authentication; has freemium pricing; offers a free tier (2,500 names/month, no credit card required); rate limits: Quota counted per name against monthly plan; exceeding returns 429; per-IP limit also applies. Responses include X-Rate-Limit-Limit/Remaining/Reset headers. Batch up to 10 names per request.. Verified 2026-07-08 with per-field source links.
Pricing
Free: 2,500 names/month; Basic: 25,000/mo $20; Standard: 250,000/mo $60; Plus: 2,500,000/mo $180; Premium: 25,000,000/mo $540; yearly billing = pay for 10 months; Enterprise via contact sales
genderize.io ↗Rate limits
Quota counted per name against monthly plan; exceeding returns 429; per-IP limit also applies. Responses include X-Rate-Limit-Limit/Remaining/Reset headers. Batch up to 10 names per request.
genderize.io ↗OpenAPI spec
not documented null
no source