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Changelog

Changes that affect your integration, newest first. Live status of the API: Status.

2026-11-03​

New check fields. POST /v1/check also returns:

  • relay: true for privacy relay addresses (Apple Hide My Email, DuckDuckGo, Firefox Relay…). Never true together with disposable.
  • provider: who runs the inbox, such as gmail, google-workspace or duckduckgo.
  • registration: the date the email's domain was registered.
  • alias: every alias trick the inbox was used with (plus, dots, …).
  • found: how many other companies using Signitize saw the inbox used with an alias.

The existing fields are unchanged.

Bulk checks. New POST /v1/check/batch (Premium) checks up to 50 addresses per request, and npx signitize clean users.csv checks a whole CSV export. Guide: Clean an existing user list.

Enterprise. Premium plus bulk credits that never expire, for large lists. See Plans & billing.

Breaking: GET /v1/usage field names. resetsAt is now reset_at and premiumUntil is now premium_until. The response also gains bulk_credits. Update code that reads these fields.

npm signitize 2.0.0. New checkBatch(), isBatchError() and npx signitize clean; the new check fields in the types; usage() returns reset_at, premium_until and bulk_credits. See Upgrading to 2.0.

Status page. Live status of the customer endpoints at /status.

Quota emails. The account owner gets an email at 80% and at 100% of the monthly quota. See Monthly quota.

2026-11-02​

Usage endpoint. New GET /v1/usage returns your plan and this month's usage without counting a check.

npm signitize 1.1.0. New usage() method.