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⚠️ Born from a $91K bill
Kill Switch

Stop Runaway
Cloud Bills

Cloud providers have no spending caps — and neither do coding agents. One runaway loop can drain your account or burn thousands in tokens overnight. Kill Switch auto-kills runaway cloud services and caps runaway coding agents before the bill arrives. Cloudflare, GCP, AWS — and Claude Code, Cursor, or any agent.

$ > npx @kill-switch/agent-guard usage
$91K
Our bill (before)
$0
Our bill (after)
6h
Check interval
New · Agent Guard
See your real Claude Code limits — and cap the spend
Claude Code’s 5-hour and weekly limits are invisible until they lock you out mid-task. Agent Guard puts your real plan usage — the 5-hour window, the weekly cap, and the per-model weekly — right in your status bar, pulled straight from Anthropic, and warns you before you lock out. It paces you against a daily budget — your weekly cap ÷ 7 — so being 60% in with two days left stays calm, not alarmed, and it only speaks up when you’re truly burning too fast. The same guard caps runaway API spend. Free, open-source, works with Claude Code today.
How It Works
Three steps to peace of mind
Deploy in under 5 minutes. No external dependencies.
1

Monitor

Every 5 minutes, queries provider APIs for usage, costs, and anomalies across all connected cloud accounts.

2

Detect

Compares per-worker usage against your configured thresholds. Catches feedback loops, runaway DOs, and request spikes.

3

Disconnect

Removes routes and custom domains from offending workers. Code stays intact. Pages PagerDuty until someone acknowledges.

Supported Providers
Kill switches for 14 cloud services
Monitor spending and auto-kill runaway services across cloud infrastructure, AI APIs, databases, and SaaS platforms.
Cloudflare

Cloudflare

Catch runaway Workers and Durable Objects before they rack up millions of requests.

  • Worker request volume spikes
  • Durable Object wall-time hours
  • R2, D1, Queues, Stream costs
  • Route removal & domain disconnect
Google Cloud

Google Cloud

Stop runaway Cloud Run containers and GCE instances from spiraling your billing.

  • Cloud Run auto-scaling spikes
  • Compute Engine instance hours
  • Cloud Functions invocation surges
  • Billing API threshold alerts
AWS

AWS

Shut down Lambda feedback loops and EC2 sprawl before your bill hits five figures.

  • Lambda invocation runaway
  • EC2 instance sprawl detection
  • ECS/Fargate task explosion
  • Cost Explorer threshold triggers

Plus financial kill switches for RunPod · Redis · MongoDB · OpenAI · Anthropic · xAI · Replicate · Snowflake · Vercel · Datadog · Neon · Neo4j

Features
Built for production
Everything you need to sleep through the night.
🛡️

Reversible Disconnect

Removes routes, not code. Your worker stays intact — just stops receiving traffic. Re-enable with a single deploy.

📞

PagerDuty Integration

Critical alerts that call your phone until someone acknowledges. No more waking up to surprise bills.

💬

Discord & Slack

Free alerting via Discord webhooks or Slack incoming webhooks. Rich embeds with usage details.

🔒

Protected Workers

Mark critical workers as protected. They'll trigger alerts but never get disconnected automatically.

⚙️

Configurable Thresholds

Set limits for DO requests, wall-time hours, and Worker request volume. Tune based on your normal usage.

🌐

Zero Dependencies

Single TypeScript file. No npm packages beyond Wrangler. Deploys in under a minute.

Quick Start
Two ways to get started
Use our managed platform or self-host the open-source version.

Managed Platform

Sign up, connect your cloud credentials, set your thresholds. Done.

  1. 1. Create an account
  2. 2. Connect Cloudflare, GCP, or AWS
  3. 3. Set cost thresholds and alert channels
Get Started
Self-Hosted (Open Source)
# Clone and deploy
git clone https://github.com/Divinci-AI/kill-switch
cd kill-switch
npm install && wrangler deploy

# Set your secrets
wrangler secret put CLOUDFLARE_ACCOUNT_ID
wrangler secret put CLOUDFLARE_API_TOKEN
wrangler secret put PAGERDUTY_ROUTING_KEY

# Test it
curl https://your-worker.workers.dev/test-alert
Why This Exists
Cloud providers have no spending caps
Real incidents from the community. This is not theoretical.
$91K Cloud Bill
$91,316
Cloud compute bill from runaway containers generating 1.38 billion requests in one month. $88K in compute duration alone.
Us (the authors of this project)
$5,000+
Cloud service feedback loop running unchecked. Possibly $20,000+ before manual intervention.
Cloud Provider Community Forum
$20,000+
Uncontrolled writes from a retry loop bug. No native circuit breaker to stop it.
Hacker News
$104,500
Free-tier static site hit 60.7 TB of bandwidth in four days. One MP3 downloaded millions of times.
r/webdev — Netlify bill →
$96,280
Artist app Cara went viral; Vercel functions spiked to 56M invocations/day. Bootstrapped, no spending cap.
Hacker News — Cara / Vercel →
$47,000
Two AI agents locked in a recursive loop, exchanging clarification requests thousands of times around the clock.
DEV Community →
$30,000
AWS Bedrock + Claude Opus billed $30K despite a cost-cap setting the customer believed was enabled.
The Register →
$6,000
Someone left Claude Code running overnight. Token-based billing plus an agentic loop did the rest.
MakeUseOf →
Read the full stories on our blog →
Straight From the Source
People are posting these in real time
From founders and indie devs — the bill-shock conversation, in real time.

Scroll right to expand the wall

Embedded directly from the original posts — nothing here is altered or out of context.
Got a bill-shock story? Tell @KillSwitchCloud.

Pricing
Simple, transparent pricing
Start free and self-host the open source version, or go hands-off with a paid plan from $29/mo.
Free
Open source & self-host
$0/mo
  • 1 cloud account
  • 6-hour check interval
  • 1 alert channel
  • Self-host the open-source version
  • Community support
Start free
Pro
For teams shipping fast
$29/mo
  • 3 cloud accounts
  • 5-minute check interval
  • All alert channels
  • Anomaly detection
  • FinOps cost analytics
  • Rule presets & custom rules
Upgrade to Pro
Team
For growing organizations
$99/mo
  • 10 cloud accounts
  • 5-minute check interval
  • Team roles & audit log
  • API access
  • Priority support
  • Everything in Pro
Upgrade to Team
Enterprise
For large-scale operations
Custom
  • 100+ cloud accounts
  • 1-minute check interval
  • SSO & SAML
  • Dedicated support & SLA
  • Custom integrations
  • Everything in Team
Contact Sales
Open Source & SaaS
Stop your next surprise bill

Self-host the open source core or use our managed platform.
Either way, you're protected in under 5 minutes.

Get Started Free View on GitHub