API Monitor watches your OpenAI, Anthropic, ElevenLabs & Replicate spend every hour, forecasts end-of-month costs, and auto-fires kill switches before budgets spiral.
No credit card required · 5-minute setup
Spend
$1,247
+12% vs last week
Threshold
$2,000
Keys
8
4 providers
OpenAI key approaching threshold
62% used · alerted via #engineering
Weekly spend
7 days
5
alert channels
$2M+
in overages prevented
4
providers supported
Monitoring your entire AI stack
Everything you need
Usage charts, multi-channel alerts, team workspaces, and the tools to keep your AI spend predictable.
Fire a webhook when budget is exceeded — pause deployments, rotate keys, or trigger any custom action. Active protection, not passive alerts.
Velocity extrapolation projects end-of-month spend. Z-score anomaly detection flags unusual spikes before they become problems.
Email, Slack, Discord, SMS, and PagerDuty. Percentage-based notifications with cooldowns so you get warned once, not spammed.
Monthly, weekly, or custom reset cycles. Set rolling budgets like "$500/week" and get fresh alerts each period automatically.
Connect your deployment platform via OAuth. Kill switch auto-rotates env vars when budget is exceeded — no webhook plumbing needed.
30-day spend charts across all providers. Daily or weekly branded email digests so you never lose track of trends.
Lock down your mon_* API keys to specific CIDRs. Query usage, alerts, and forecasts via /api/v1 endpoints programmatically.
Multi-workspace support with role-based access. Switch between personal and team workspaces in one click.
How it works
Add a key from OpenAI, Anthropic, ElevenLabs, or Replicate. Encrypted instantly with AES-256.
Pick severity, cooldown, and notification channel. Enable the kill switch to auto-fire a webhook when budget is exceeded.
Usage is polled hourly, forecasts project EOM spend, anomalies trigger alerts, and digest reports land in your inbox.
Notifications
Five notification channels, smart cooldowns, and auto-kill switches — configured per API key with severity levels.
API Monitor · 14:32
OpenAI key crossed 80% of $2,000 limit
$1,612.40 used in the last 7 days
[Alert] Anthropic spend at $487 / $500
Threshold of 97% reached at 14:31 UTC
Customers
“We were burning $4,000/month on OpenAI without realizing one endpoint was running inference on every page load. API Monitor caught it in hours.”
Marcus Reid
CTO, Loopline AI
“I manage API keys for 12 clients. Before this tool I was constantly firefighting surprise bills. Now I sleep well knowing each has a hard cap.”
Priya Sharma
Founder, DevStack Agency
“The Slack integration alone is worth it. Our #engineering channel gets a heads-up before any budget is hit. Setup took 5 minutes.”
Tom Nakamura
Lead Engineer, Fieldnotes
No credit card. No infrastructure. Just paste a key and we'll take it from here.
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