API Monitor watches your OpenAI & Anthropic spend every hour and pings your team the moment costs threaten to spiral.
No credit card required · 5-minute setup
Spend
$1,247
+12% vs last week
Threshold
$2,000
Keys
8
2 providers
OpenAI key approaching threshold
62% used · alerted via #engineering
Weekly spend
7 days
5,000+
API keys monitored
$2M+
overages prevented
99.9%
uptime SLA
Why teams choose us
Three primitives that turn every AI bill into a predictable line item.
Set dollar thresholds per API key. When usage gets close, we alert you — before the bill arrives.
Route to email or any Slack workspace. Each alert can have its own destination, threshold, and recipients.
Keys are encrypted at rest with AES-256-CBC. We never log, expose, or read your API keys after storage.
How it works
Add an OpenAI or Anthropic key. It is encrypted instantly with AES-256.
Set the dollar amounts that matter. Pick email, Slack, or both.
We poll usage every hour. The moment spend crosses your line, you know.
Notifications
Route alerts to email or any Slack workspace. Different thresholds, different channels — configured per API key, ready in under a minute.
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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