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Install

npm i @burn0/burn0
The setup wizard runs automatically after install. You can skip it and configure later with npx burn0 init.

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Add the import

Add this as the first import in your app’s entry file (before any SDK imports): 
import '@burn0/burn0'  // Must be first!

import express from 'express'
import OpenAI from 'openai'
// ... rest of your app
burn0 must be imported before any API SDK (OpenAI, Anthropic, etc.). It patches fetch and http globally — if an SDK initializes first, its calls won’t be tracked.

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Run your app

npm start
You’ll see costs appear in your terminal as API calls happen: 
  burn0 ▸ $0.0038 today (3 calls) ── openai: $0.0035 · resend: $0.0003
When you stop the app (Ctrl+C): 
  burn0 ▸ session: $0.0038 (3 calls, 2m 15s) ── today: $0.0038 ── ~$3.42/mo

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Check your costs

npx burn0 report

  burn0 report ── last 7 days

  Total: $12.47 (342 calls)

  openai         $8.32   ██████████████░░░░░░  67%
  anthropic      $3.15   ██████░░░░░░░░░░░░░░  25%
  google-gemini  $0.85   ██░░░░░░░░░░░░░░░░░░   7%
  resend         $0.15   ░░░░░░░░░░░░░░░░░░░░   1%

  ── projection ─────────────────────────────
  ~$53/mo estimated (based on last 7 days)

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Optional: Connect to the dashboard

For team visibility and historical data, connect a free API key:
1

Sign up

Go to burn0.dev/login and sign in with GitHub.
2

Create an API key

Navigate to Dashboard → API Keys → Create new key.
3

Add to your project

npx burn0 connect
Paste your API key when prompted.
4

See costs in the dashboard

Visit burn0.dev/dashboard to see costs across all your projects.

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Next steps

CLI Reference

All CLI commands

Track features

Attribute costs to specific features

Dashboard

Visual cost breakdown

Supported services

50+ services tracked