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An API key comes from the Investorlift developer console. Sign in with your Investorlift account, the account you use on the marketplace. If you have none, create one there. Accept the developer agreement once. Subscribe to the Free plan. The console asks for a card and keeps it on file. The Free plan charges nothing. Copy the key from Keys and usage. The console creates the key with the subscription, so you get a key when you subscribe. The key starts with zpka_. It works on /v1 and on the MCP endpoint alike. Every snippet on this site reads it from GM_API_KEY.

Open the developer console

Sign in with Investorlift. Subscribe to Free. Copy the key. This takes about two minutes.
Then the Quickstart makes the first call in five minutes. Plans and limits says what a key can do each minute and each month. On Your keys you copy a key again, roll it or delete it.