Validate startup ideas without leaving the chat
Your AI assistant is great at cheering you on. It is bad at telling you the idea won't sell. Connect IdeaKiller and it answers with live market research instead of guesses.
Short answer: in ChatGPT or Claude, add a custom connector with the URL
https://api.ideakiller.app/mcp, sign in once, then write "validate my idea: …". You get a sourced verdict in about 90 seconds.
Connect in three steps
- Add the connector. ChatGPT or Claude: add a custom connector with the URL https://api.ideakiller.app/mcp and pick OAuth (ChatGPT may require Developer mode for custom connectors). Claude Code, Cursor and other MCP clients: use the snippets below with a key.
- Sign in once. Sign in with Google: one balance for ideakiller.app, ChatGPT and Claude. Or create a key in one click, no email. Top up from $20 on the website.
- Ask in plain words. "Validate my idea: …". The assistant calls validate_idea and reads you the verdict in about 90 seconds (light, $0.50). Want the deep version? Ask for the full check, $1.00.
What the assistant can do
validate_idea: Checks an idea with live web research. Light check $0.50, full check $1.00. Returns the verdict, five scores, the weakest point, evidence marked fact or estimate, and one first test.get_validation: Reads the result of a check that is still running or already done.find_domains: Finds up to 10 free domain names for the idea, with reasons. $0.50.get_domains: Reads the result of a domain search.get_balance: Shows your prepaid balance and prices.
What you get back
A verdict (GO, CONDITIONAL GO, PIVOT or NO GO), scores for demand, competition, problem fit, unit economics and risk, the single weakest point, evidence with links marked as fact or estimate, and one cheap test to run first. See real examples in the idea teardowns.
Price and privacy
- Prepaid balance, top up from $20. No subscription. The same balance works on the website, in ChatGPT, in Claude and over the API.
- A check that fails is refunded automatically.
- In ChatGPT, Claude and the API, the idea text is deleted after the result is delivered.
For developers
Claude Code, Cursor and other MCP clients connect with an API key. Get a key, then read the REST API docs or the agent guide.