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Postern
One MCP gateway to your money, health, mail, and home
Postern connects your Money, Health, Calendar, Mail, Contacts, and Home to any AI agent or harness through one self-hosted gateway. No glue code, no credentials handed to the agent, no guessing endpoints or schemas. Most of the information is served from the local cache, while the agents can fetch any information live. Access is granted per sector, per agent, is easily revocable, and all access by agents is audited and logged.
I have been trying to integrate my life with AI for the last 3-4 years. When LLMs came out, I built a few AI-powered tools to query my health and personal data. I realized Agents were incurring a huge discovery cost trying to figure out which API to call, what the data schema would look like, etc. So I built the Just-In-Time API (JITAPI). An MCP server that helps the LLM figure out API endpoints at runtime without overloading the context with huge API specs. Once the harnesses arrived, I started integrating different parts of my life, such as health, Money, and home, by writing custom code and sharing credentials with the agents. The idea of agents having access to everything while I am flying blind about what they have access to sounded scary, so I built Clawlense. An OpenClaw plugin that shows you exactly what the agents are up to.
While doing all of this, I noticed a pattern
1. Every agent paid a discovery cost, trying to figure out what API to call and what the data schema would look like
2. Rewriting of the glue code for different agent harnesses and platforms.
3. How insecure it is to share credentials and live tokens with agents, and doing it the right way is complex.
4. No visibility into what an agent has access to, no granular control over their access.
Postern solves all four of the above and more. It has been running my life for the last 2 months. 14 connections, 8 services, 4 agents on top.
About Postern on Product Hunt
“One MCP gateway to your money, health, mail, and home”
Postern was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #36 on the daily leaderboard. Postern connects your Money, Health, Calendar, Mail, Contacts, and Home to any AI agent or harness through one self-hosted gateway. No glue code, no credentials handed to the agent, no guessing endpoints or schemas. Most of the information is served from the local cache, while the agents can fetch any information live. Access is granted per sector, per agent, is easily revocable, and all access by agents is audited and logged.
On the analytics side, Postern competes within Open Source, Developer Tools, Artificial Intelligence and GitHub — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how Postern performed against the three products that launched closest to it on the same day.
Who hunted Postern?
Postern was hunted by Neelabh Kumar. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Postern including community comment highlights and product details, visit the product overview.
Neelabh Kumar