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Sign up free at console.mnemoverse.com — no credit card. Your key starts with mk_live_; copy it into your tool's MCP config or the X-Api-Key header. The Free tier gives you 1,000 queries a day and 10,000 atoms. For VS Code there's also a keyless extension — install it and click Sign In, no key to paste.

MCP servers are loaded when the client starts, so fully quit and reopen the app after editing the config (.mcp.json, .cursor/mcp.json, .vscode/mcp.json, or Claude Desktop's config) — a project reload isn't enough. Then check the JSON is valid (no trailing commas) and the key is the full mk_live_ value. See the per-client setup in the docs.

Three things to check: the key must start with mk_live_, it must be pasted in full with no trailing spaces or newlines, and it must still be active. If it looks right and still fails, the key may have been rotated — create a fresh one in the console. Full details are in the API security docs.

Limits are per plan: Free is 1,000 queries/day at 60 requests/min; Pro is 50,000/day at 600/min; Team is 500,000/day at 3,000/min. A 429 means you've hit one of these — the response includes a Retry-After; wait for that window to reset and retry. You can check usage and upgrade at console.mnemoverse.com, and the security docs cover the limits in detail.

Two common reasons. First, the importance step skips near-duplicates — a write can succeed without adding a new atom if it's almost identical to one you already have. Second, domain mismatch — if you write to one domain and read from another, the query won't find it. Check your atom count with the stats call to confirm what's actually stored.

Claude Code, Claude Desktop, Cursor, VS Code, Windsurf, ChatGPT, the Python SDK, and any HTTP client. MCP clients get the memory tools natively; ChatGPT and other callers reach the same memory over the REST API — the same atoms are visible from every client.