Feature request: public API for standard API balance, resource packages, and billing usage

[Marksman4971]

Hi Z.ai team,

I am using the Z.ai / BigModel standard API with GLM-5.1 resource packages. I noticed that GLM Coding Plan already has usage-query support through monitoring endpoints, but I could not find an official public API for standard API billing data.

Could you consider adding documented API endpoints, or SDK methods, for:

1. Current account balance
2. Resource package balance and expiry date, for example GLM-5.1 token packages
3. Per-model usage in a date range
4. Monthly bill / cost summary
5. Whether a request was deducted from cash balance, free quota, voucher, or resource package

This would help users build internal cost dashboards, weekly usage summaries, and budget alerts.

Additional context:

In my current multi-provider setup, several major providers already expose official or documented ways to retrieve balance or billing signals:

• DeepSeek provides a /user/balance API.
• Moonshot/Kimi provides a balance API.
• Alibaba Cloud exposes account balance and billing data through BSS OpenAPI, which can be used for Bailian / Model Studio cost tracking.
• Z.ai itself already provides usage-query endpoints for GLM Coding Plan.

The missing piece is the standard BigModel API account/resource-package path. For users who buy GLM-5.1 token packages or use prepaid resources, there does not seem to be a clearly documented API to check remaining quota, package expiry, or deduction source.

Current behavior observed:

• /api/monitor/usage/quota/limit appears to work only for Coding Plan users.
• For a standard BigModel API key, it returns: ???????coding plan.
• The standard API key can call glm-5.1 successfully.
• The standard API response includes token usage, but does not expose remaining resource-package quota or deduction source.

Expected:

A stable documented API or SDK method for standard API billing/resource-package usage, separate from Coding Plan.

This would make automated cost tracking easier and more consistent with other providers.

Thanks.