mem0ai/mem0 · error · AuthError

Authentication failed. Your API key may be invalid or expire

Error message

Authentication failed. Your API key may be invalid or expired.

What it means

Error "Authentication failed. Your API key may be invalid or expired." thrown in mem0ai/mem0.

Source

Thrown at cli/python/src/mem0_cli/backend/platform.py:43

        self._client = httpx.Client(
            base_url=self.base_url,
            headers={
                "Authorization": f"Token {config.api_key}",
                "Content-Type": "application/json",
                "X-Mem0-Source": "cli",
                "X-Mem0-Client-Language": "python",
                "X-Mem0-Client-Version": __version__,
            },
            timeout=30.0,
        )

    def _request(self, method: str, path: str, **kwargs: Any) -> Any:
        from mem0_cli.state import capture_notice, is_agent_mode

        self._client.headers["X-Mem0-Caller-Type"] = "agent" if is_agent_mode() else "user"
        resp = self._client.request(method, path, **kwargs)
        if resp.status_code == 401:
            raise AuthError("Authentication failed. Your API key may be invalid or expired.")
        if resp.status_code == 404:
            raise NotFoundError(f"Resource not found: {path}")
        if resp.status_code == 400:
            # Extract API error detail when available
            try:
                detail = resp.json().get("detail", resp.text)
            except Exception:
                detail = resp.text
            raise APIError(f"Bad request to {path}: {detail}")
        resp.raise_for_status()
        if resp.status_code == 204:
            return {}
        data = resp.json()

        # Pull the unclaimed-Agent-Mode notice out of the body (or the header
        # fallback for endpoints that return non-dict / non-dict-leading
        # payloads) and stash it for end-of-command surfacing.
        notice = None

View on GitHub (pinned to 001c235229)

Solutions

1. Verify your Mem0 API key is correct and not expired; regenerate it in the Mem0 dashboard if needed.
2. Check that the MEM0_API_KEY environment variable is set and passed to the client.

When it happens

Trigger: Thrown at cli/python/src/mem0_cli/backend/platform.py:43 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

AI-assisted analysis of mem0ai/mem0@001c235229 (2026-08-15). Data as JSON: /api/errors/70a1eb6e4712964e. Report an issue: GitHub.