Developer documentation

Changes to the public API are listed here, newest first. Within v1 we only add fields, endpoints and error codes; nothing is removed or renamed without a new version.

1.0.0 — 2026

Initial release.

• API keys with live and test modes, scopes, IP allowlists and expiry.
• Keys of a pending or suspended account are refused with 403 account_inactive until the account is active again.
• One response envelope and a stable error_code catalog for every error.
• Per-key rate limits and Idempotency-Key support for safe retries.
• GET /wallet/balance.
• Bulk SMS: single, broadcast, personalized and group sends.
• Bulk SMS: batch and per-message tracking with automatic refunds for failed messages.
• Bulk SMS: groups and contacts management.
• Bulk SMS: a group name is unique per account and up to 100 characters; creating or renaming a group onto a name the account already uses answers 422.
• Bulk SMS: adding contacts updates names without re-activating a contact that was paused in the dashboard.
• OpenAPI 3.1 document and an interactive API reference.