GenderAPI.io

GenderAPI.io is a name-based inference and data-enrichment service that estimates gender from a first name, full name, email address or username. It returns structured JSON with the prediction, a confidence score, the prediction source and optional country context, and distinguishes identified results from unknown ones so workflows can preserve uncertainty. Results are associations with the supplied text rather than verification of a person's identity.

The V2 REST API supports single lookups and batches of up to 50 records, with AI modes including dataset lookup, automatic fallback, always-AI and nickname inference. Integrations cover Google Sheets, Excel and CSV uploads, the Excel add-in, Shopify, Airtable, and no-code platforms such as Make, Zapier, Pipedream, Pabbly Connect and Integrately, alongside Python and JavaScript guides. Coverage includes Latin and non-Latin scripts.

It is aimed at teams enriching CRM, lead, analytics and commerce records. Packaging is credit-based: a free registered account provides a daily credit allowance, an IP trial offers a smaller shared allowance, and paid plans are available as monthly credit packages or a one-time balance, with credits consumed per completed lookup depending on the AI mode used.