| What it does | Send SMS, WhatsApp, and RCS messages via REST API or official SDKs
| Official TypeScript SDK for sending messages, managing files and templates, with retries and webhook verification
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Paid
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| Pricing | Usage-based pricing with carrier pass-through fees varying by channel and destination country. Volume discounts available for 1M+ messages/month.
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| Key features | - REST API for SMS, WhatsApp, and RCS messaging
- Official SDKs for TypeScript, Python, Go, Java, C#, PHP, and Ruby
- Pre-built OTP and verification templates
- Webhook support for delivery events and real-time updates
- Message templates with approval workflow
- Messaging to 200+ countries with compliance tracking
- Light onboarding without KYC verification
- Auto Charge billing for automatic account top-ups
| - Send messages across WhatsApp Cloud and other channels
- Upload and manage media files
- Template support with parameters
- Automatic retries with exponential backoff
- Webhook signature verification
- Pagination with cursor support
- Detailed error handling with fix suggestions
- No dependencies, uses native Fetch API
- Access to all heysteff API endpoints
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| What makes it different | - Unified API supporting SMS, WhatsApp, and RCS through a single integration
- Start sending immediately without KYC with light onboarding in 2 minutes
- Free trial with 500 real sends per day and pre-built templates
- Official SDKs for seven programming languages including TypeScript, Python, and Go
- SOC 2 Type II certified for compliance and security
| - Works across Node 20+, Deno, Bun and Cloudflare Workers with no dependencies
- Built-in idempotency prevents duplicate messages and payments across system restarts
- Automatic retry logic with growing delays and Retry-After header support
- Webhook verification with timestamp validation
- Full TypeScript types for API integration
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 62 ▼ −2 (down) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 20 | 0 |
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| Citation Flow (Majestic) | 36 | 0 |
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| Referring domains (Majestic) | 71 | 0 |
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heysteff SDK