Cloud Billing Budget API
Cloud Billing Budget API
Cloud Billing Budgets API programmatically creates and manages GCP budget alerts — set thresholds, configure notification channels, monitor across projects.
Replaces manual console configuration — batch-manageable
Alerts have lag (hours) — not suitable for real-time hard limits
POST /v1/billingAccounts/{billingAccount}/budgets to create — specify amount, scope (project/service), and thresholds (e.g. 50%, 90%, 100%).
Uptime · 30-day window
About this API
GCP doesn't have "hard spending limits" (auto-shutoff on overrun), so budget alerts are the main cost-control tool. Billing Budgets API lets you script budget management — configure 50%/90%/100% alert thresholds for each project, with notification channels (email, Pub/Sub topic). Most powerful use: combined with Cloud Functions for auto-response — when budget exceeds 100%, Pub/Sub triggers a Function that auto-disables all billable services in the project (great for dev/test environments to prevent runaway costs). Also supports forecasted-spend mode — based on month-to-date trend, alerts days in advance. Compared to console UI configuration, the API's value is "auto-configure standard budgets for each new project".
What you can build
- 1Set budget alerts for each GCP project
- 2Auto-create standard budgets for new projects in CI/CD
- 3Centrally view all budgets and consumption
- 4Trigger Pub/Sub for auto-response (e.g. disable project on overrun)
Strengths & limitations
Strengths
- Replaces manual console configuration — batch-manageable
- Notifications via email, Pub/Sub, and auto-disable actions
- Forecasted spending triggers early alerts
Limitations
- Alerts have lag (hours) — not suitable for real-time hard limits
- Cannot directly cap spending — only alerts/notifications
Example request
curl https://google.com/<endpoint>Getting started
POST /v1/billingAccounts/{billingAccount}/budgets to create — specify amount, scope (project/service), and thresholds (e.g. 50%, 90%, 100%).
FAQ
Can I auto-shutdown a project when budget is exceeded?+
Not directly. Combine Pub/Sub + Cloud Function: budget exceeded → Pub/Sub message → Function calls Billing API to unlink the billing account.
How accurate are budget alerts?+
GCP spending data typically updates within 24 hours. Short-term alerts may lag (e.g. a recent spike may not trigger for hours).
Technical details
- Auth type
- unknown
- Pricing
- unknown
- Protocols
- REST
- SDKs
- python, javascript, go, java
- Response time
- 40 ms
- Last health check
- 5/12/2026, 7:37:30 AM
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