You can select "Authentication-Free" for your API when creating it.

• If "Authentication-Free" is checked, authentication will succeed and the bound usage plan will take effect when API Gateway receives an anonymous request.
• If signature authentication is performed with the key in the usage plan, the traffic limit in the usage plan will take effect.
• In case of access by an anonymous user, the maximum traffic limit imposed on each API by Tencent Cloud will take effect.