| What it does | Phone, email, IP and domain validation API with traceable evidence
| 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 | GB
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| Pricing model | Freemium
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| Pricing | Free: 500 credits once on signup, no card required. Starter: £19/month for 20,000 credits per month. Growth: £49/month for 85,000 credits per month. Professional: £149/month for 300,000 credits per month. Phone, email and IP checks cost 1 credit each; domain checks cost 2 credits.
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| Key features | - Phone validation with format checking and numbering plan validation
- Email validation with domain existence and MX record checking
- IP address classification and special-purpose registry screening
- Domain infrastructure validation including DNS, SPF and DMARC checks
- Unified response format across all four check types
- Structured policy actions with machine-readable reason codes
- Idempotent retries with credit replay
- TypeScript SDK with versioned API contract
- Evidence and limitations in every response
- 90-day credit rollover across all plans
| - 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 | - Every finding names its source and every capability limitation is explicitly stated in the response
- One unified API endpoint and response shape for four different validation types
- Maintained checks and registries with pinned upstream data and SHA-256 verification
- Transparent credit costs shown before running checks and returned in every response
| - 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) | 3 ▼ −1 (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) | 23 | 0 |
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| Referring domains (Majestic) | 65 | 0 |
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Orisift
heysteff SDK