🎁 Founding Member — First 5 users get Growth tier ($99/mo) free for life. Claim your spot →
Caplyr on PeerPush
AI Cost Control Plane

Stop runaway API
bills automatically

A single prompt loop can burn $1,000+ overnight. Are your API calls protected?

Budget guardrails, auto-downgrade, and kill switch for your AI API calls. Two lines of code. Zero config.

Works with OpenAI, Anthropic, Groq & Together AI. No rewrites. No proxy. No infra changes.

Protect My AI Costs

Free tier available · No credit card required · 3 founding member spots left

app.ts
// Works with OpenAI, Anthropic, Groq, Together AI
import OpenAI from "openai"
import { protect } from "caplyr"
const client = protect(new OpenAI(), {
apiKey: "caplyr_sk_...",
budget: { monthly: 500 },// cap in $
})
// That's it. Use client exactly as before.
// Same API — Caplyr is invisible.

Without Caplyr

A prompt loop starts at 2:14 AM.

No one notices for 6 hours.

$800 bill by morning.

With Caplyr

Same prompt loop starts at 2:14 AM.

Caplyr detects the anomaly.

Stopped in 14 seconds.

Control, not visibility

Caplyr sits in the execution path of your AI calls. It doesn't just watch — it enforces.

Budget Guardrails

Set a limit. Hit it — we block the request. No exceptions, no overruns, no surprise invoices.

Your budget is law →

Auto Downgrade

Running hot? We switch to a cheaper model instantly. Your app stays up. Your costs go down. Users never notice.

Sonnet → Haiku, zero downtime →

Kill Switch

Something wrong? One click. All AI calls stop. All spend stops. Instantly. No questions asked.

The panic button you need →

Live enforcement data

1

request blocked

1

request downgraded

$0.006

saved in 3 minutes

From a real test run — not a simulation.

Set up in under 5 minutes

Step-by-step guides for Vercel, Railway, AWS Lambda, Docker, and more.

View Setup Guides →

Two lines. Full protection.

Wrap your AI client. Everything else stays the same.

1

Install

npm install caplyr

2

Wrap

Add protect() around your client

✓

Protected

Budget enforced, anomalies caught, costs controlled

🎁 Founding Member Offer — 3 of 5 spots remaining

Protect your AI spend

Priced by the spend you protect, not the features you use.

Most teams recover their subscription cost from the first prevented incident.

Free

$0

Protects up to $50/mo

  • ✓1 project
  • ✓1 provider
  • ✓Basic guardrails
  • ✓24h data retention
Get Started

Starter

$29/mo

Protects up to $500/mo

  • ✓3 projects
  • ✓2 providers
  • ✓Kill switch
  • ✓Email alerts
  • ✓30d retention
Start Free Trial
Free for Life

Growth

$99 $0/mo

Founding Members only · 3 spots left

  • ✓10 projects
  • ✓All providers
  • ✓Multi-model routing
  • ✓Slack + email alerts
  • ✓5 team members
  • ✓90d retention
  • ★Founding Member badge
Claim Free Spot

Scale

$299/mo

Protects up to $25,000/mo

  • ✓Unlimited projects
  • ✓All providers
  • ✓Custom routing rules
  • ✓Webhooks + API
  • ✓15 team members
  • ✓1 year retention
Start Free Trial

Your AI costs are unprotected.
Fix it in 2 minutes.

Install the SDK, set a budget, and never worry about runaway bills again.

$ npm install caplyr

Works with OpenAI, Anthropic, Groq & Together AI · Open-source SDK · Free tier forever