Matrix.org
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PostalDataPI
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Melissa Data Quality
PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate โ $0.000028 per query with no tiers or subscriptions.
What you get back: Up to 18 metadata fields per postal code โ city, state/region, coordinates, timezone, three levels of administrative hierarchy, elevation, and more. Sub-5ms cached responses.
Works everywhere: US ZIP codes, UK postcodes, German PLZ, Japanese postal codes, Canadian FSAs, and 230+ more. Format normalization handles case, spacing, and hyphen variations automatically.
Get started in 60 seconds: 1,000 free queries on signup, no credit card required. SDKs for Python and Node.js. MCP server for AI agents (Claude, Cursor, etc.).
Built for developers: REST API, consistent JSON responses across all countries, OpenAPI spec, llms.txt for AI agent discovery.
Matrix.org
PostalDataPIMatrix.org is recommended for individuals and organizations that prioritize privacy and security in their communications. It's ideal for tech-savvy users who value open-source solutions and those who seek to avoid centralized communication platforms. Additionally, it's suitable for developers looking to build custom communication solutions using a versatile protocol.
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Technical implementation should include privacy controls as core features, not afterthoughts. Build data export functionality, implement secure deletion processes, and provide transparency reports showing what data you've collected and shared. Open-source privacy tools like Tor and Matrix provide excellent examples of privacy-first architecture design. - Source: dev.to / 4 months ago
Matrix is an open, decentralized communication protocol for real-time messaging, voice, and video. Synapse is the reference homeserver implementation -- the software you run to participate in the Matrix network. Think of it like email: you run your own server, but you can communicate with anyone on any other Matrix server worldwide. - Source: dev.to / 4 months ago
Matrix is the decentralized Slack of the future (or present really!). - Source: dev.to / 5 months ago
/me sighs; Merry Christmas everyone. For what it's worth, we've been working on improving Matrix's metadata footprint this year: MSC4362 (https://github.com/matrix-org/matrix-spec-proposals/blob/kaylendog/msc/simplified-encrypted-state/proposals/4362-simplified-encrypted-state.md) got implemented on matrix-js-sdk for encrypting room state (currently behind a labs flag on Element Web). Meanwhile more radical... - Source: Hacker News / 7 months ago
I think most of these are built using Matrix: https://matrix.org. They have connections with most providers like iMessage, FB, Instagram, etc. - Source: Hacker News / 11 months ago
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
Telegram - Telegram is a messaging app with a focus on speed and security. Itโs superfast, simple and free.
Revolt.chat - Don't bother with chat apps that don't respect your privacy. Revolt is a brand new chat platform designed around you.