One API, every channel
Send across email, SMS, and WhatsApp from a single endpoint with scoped API keys, idempotency, and rate limits. Node/Python code samples included.
For SaaS & product teams
Messaging your product can rely on.
One REST API for email, SMS, and WhatsApp — with idempotent sends, HMAC-signed webhooks, an OpenAPI spec, and OAuth 2.1 access for AI agents.
01How QuickGrow helps
Signed webhooks
HMAC-SHA256 delivery events with a replay window and delivery logs, documented via a public OpenAPI spec.
AI agents (MCP)
Authorize Claude or any LLM over OAuth 2.1 with scoped access and a mandatory human-approval gate before anything sends.