Ask your AI which open-source robot to buy, with today's price

11 robots, 4 in stock right now. Your agent can search by budget and type, read the license and build difficulty, and get a seller link for each listing. Every fact comes with its source link and checked date.

Connect over MCP Use the JSON API

Connect over MCP

One address, no sign-in. The server is read-only: it cannot buy anything or sign anyone up.

MCP address

https://openrobotkits.com/mcp

Claude Code

Terminal

claude mcp add --transport http openrobotkits https://openrobotkits.com/mcp

ChatGPT or Claude chat

Add a custom connector, paste the address above, no sign-in needed. ChatGPT asks you to turn on Developer Mode first.

Cursor or any client with a JSON config

.cursor/mcp.json

{
  "mcpServers": {
    "openrobotkits": {
      "url": "https://openrobotkits.com/mcp"
    }
  }
}

Check it by hand

Terminal: initialize

curl -s https://openrobotkits.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"my-agent","version":"1.0"}}}'

Terminal: search arms under $300

curl -s https://openrobotkits.com/mcp \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"search_robots","arguments":{"type":"arm","max_price":300}}}'

Tools your agent gets

Tool	Takes
`search_robots`	query, max_price, type
`get_robot`	slug
`where_to_buy`	slug

search_robots: Up to 10 robots with the lowest in-stock USD price, stock state, license and page link
get_robot: Everything on a robot page: what it is, license, difficulty, build time, cost lines, every offer, sourced facts with links
where_to_buy: Every seller listing, in-stock whole kits first, with price, stock, checked date, buy link and seller page

Server card: /.well-known/mcp/server-card.json

Use the JSON API

Plain GET requests, no key, open CORS. Same data as the pages and the MCP tools.

All robots

curl -s https://openrobotkits.com/api/robots.json

One robot with every offer: so-101

curl -s https://openrobotkits.com/api/robots/so-101.json

Cheapest in-stock robot, with jq

curl -s https://openrobotkits.com/api/robots.json | jq '.robots | map(select(.lowest_in_stock_price)) | min_by(.lowest_in_stock_price) | {name, lowest_in_stock_price, currency, page_url}'

OpenAPI file for tool builders: /openapi.json. Every robot in one text file: /llms-full.txt. Short index: /llms.txt.

Freshness and limits

Updated daily. Prices and stock are read from each seller page once a day, around 9 AM Bangkok. Each offer carries its own checked date.
List prices. Before shipping and tax, in the seller's currency. lowest_in_stock_price is USD only and null when no whole-robot listing is in stock.
Cached for 5 minutes. Send If-None-Match with the ETag to get a 304.
Be polite. About one request per second is plenty. Send a User-Agent that names your app.
Read-only. To get an email when a robot is back in stock, a person sets an alert on its page.

What a good answer looks like

Ask

"Which open-source robot arm can I buy today under $300?"

Your agent calls

search_robots with type arm and max_price 300, then where_to_buy for the best match and links the seller with the checked date.

See the SO-101 page, the same data for people