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heysteff SDK vs flatin.pt

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

heysteff SDK compared with flatin.pt
Detailheysteff SDK logo heysteff SDKflatin.pt logo flatin.pt
What it doesOfficial TypeScript SDK for sending messages, managing files and templates, with retries and webhook verification Machine-readable data on Portuguese new-build developments, permits, and property taxes
StageNot given Established
FoundedNot given Not given
Based inNot given PT
Pricing modelNot given Freemium
PricingNot given Free for buyers: API access, calculators, guides and property requests are free. Paid real-estate mediation services available for sellers under written contract terms.
Key features
  • 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
  • HTTP REST API with no authentication required
  • MCP server for AI assistant integration
  • Building-permit barometer by municipality
  • CC BY 4.0 open dataset downloads
What makes it different
  • 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
  • No authentication or API key required for access
  • Complete coverage of all 308 Portuguese municipalities
  • Open data under CC BY 4.0 licence for reuse
  • Licensed real estate agency with AMI 28163 credential
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last check3 no change since last check
Trust Flow (Majestic)07
Citation Flow (Majestic)029
Referring domains (Majestic)028

3 details filled in for both companies.

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