Postdata MCP Server

PostData MCP server

Remote MCP server for PostData, the free sensor-data store for IoT devices and the successor to dweet.io. There is no signup and no API key, for the agent or for the device.

With it, an agent can get an unused device name, write and flash the firmware, wait for the board's first reading, and give you a live chart link, without stopping to ask anyone to create an account.

• Endpoint: https://api.postdata.cloud/mcp
• Transport: Streamable HTTP
• Authentication: none
• Registry name: cloud.postdata/postdata

This repository holds the listing and setup instructions. The server itself is hosted by PostData; there is nothing to install or run.

Tools

publish_reading is the only tool that writes. The others are read-only.

Setup

VS Code (GitHub Copilot agent mode)

Add this to .vscode/mcp.json:

{ "servers": { "postdata": { "type": "http", "url": "https://api.postdata.cloud/mcp" } } }

Or from the command line:

code --add-mcp '{"name":"postdata","type":"http","url":"https://api.postdata.cloud/mcp"}'

Claude Code

claude mcp add --transport http postdata https://api.postdata.cloud/mcp

Claude (claude.ai, Desktop, mobile)

Go to Customize → Connectors → Add custom connector, paste https://api.postdata.cloud/mcp and choose No sign-in.

Cursor

Add this to ~/.cursor/mcp.json or .cursor/mcp.json:

{ "mcpServers": { "postdata": { "url": "https://api.postdata.cloud/mcp" } } }

OpenAI Codex

codex mcp add postdata --url https://api.postdata.cloud/mcp

Gemini CLI

gemini mcp add --transport http postdata https://api.postdata.cloud/mcp

Anything else

Add a remote (Streamable HTTP) MCP server with the URL https://api.postdata.cloud/mcp and no credentials. Per-client details for Cline, Zed, Devin and others are at https://postdata.cloud/docs#mcp.

Usage

Ask your agent things like:

• Get my ESP32's DHT22 temperature and humidity onto a live chart.
• I just flashed the board. Is it posting yet?
• What did amber-otter-4821 read over the last 24 hours? Min, max and average.
• My old dweet.io sketch stopped working. Move it to PostData.
• Show me what real devices are sending, so I can copy the payload format.

A typical run: the agent calls new_device_name, writes firmware that posts JSON to the returned ingest URL, you flash the board, the agent calls wait_for_reading until the first reading lands, and then it hands you the chart URL.

Devices post over plain HTTP, HTTPS, WebSocket or MQTT-over-WebSocket. Agents that can't speak MCP can use the HTTP API described at https://postdata.cloud/llms.txt.

Things to know

• Everything is public. Anyone can read any device, and anyone who knows a device's name can write to it. Don't send credentials, personal data or precise locations.
• Each device can send one message every 30 seconds.
• Numeric history is kept for about 92 days.

Links

• Website: https://postdata.cloud
• MCP docs: https://postdata.cloud/docs#mcp
• Live devices: https://postdata.cloud/explore
• Privacy: https://postdata.cloud/privacy · Terms: https://postdata.cloud/terms
• Contact: hello@obiio.com

PostData is run by obiio. The service is free.