Built with Bolt.new

Bolt shipped it
in 2 hours.
Your first error took 4 minutes.

Bolt is incredible at getting you to production fast. But the moment your app is live, things start breaking — and Bolt isn't watching. DeepTracer is. Catches crashes, API failures, and cost spikes before your users notice.

Start watching free See how it works

Tonight — you shipped something great

Bolt.new build log

9:02pm

AI generating project structure...

9:04pm

Frontend built — React + Tailwind

9:05pm

API routes generated — Express backend

9:06pm

Stripe integration added

9:08pm

Deployed! Live at bolt.new/~/abc123

9:09pm

Posted to X: "just shipped this in 2 hours 🚀"

You go to sleep. 127 people click the link.

Production — same night

9:12pm

First user signed up — excited

9:14pm

TypeError in /api/checkout — Stripe key undefined

9:15pm

8 users hit checkout — all failed silently

11:30pm

47 failed requests — users giving up

2:47am

Memory leak — heap at 1.1GB and climbing

3:18am

Server crashed — process exited code 1

DeepTracer — caught at 9:14pm

Root cause: STRIPE_SECRET_KEY not set in production env. Bolt generated the code correctly — the env var was never deployed. Fix: add STRIPE_SECRET_KEY to your deployment settings.

Works with any Bolt.new app

React + Express + Node.js

Deployed anywhere

Free — 5 lines of code

Bolt apps in production

Bolt builds fast.
These 3 things break first.

The AI writes perfect code. But production has secrets, rate limits, and real users — none of which Bolt can predict.

Bolt-generated code

const stripe = Stripe(

process.env.STRIPE_SECRET_KEY

)

const openai = new OpenAI({

apiKey: process.env.OPENAI_API_KEY

})

Your production env

NODE_ENV production

PORT 3000

STRIPE_SECRET_KEY not set

OPENAI_API_KEY not set

TypeError: Cannot read 'undefined'

01 / 03

The env var gap

Bolt generates code that reads from process.env — but it can't set those variables in your deployment. The most common Bolt production failure: Stripe, OpenAI, and database keys that work in preview and crash immediately in production.

OpenAI spend — first 48 hours live $127.40

6pm

8pm

10pm

12am

2am

9am

11am

1pm

3pm

No rate limit set. 128 users, 1,847 API calls, no cap. You found out from your OpenAI bill.

02 / 03

The LLM cost spiral

Bolt loves adding AI features — chat, summarization, image generation. But it doesn't add rate limiting. One HN mention or Reddit post later and your OPENAI_API_KEY is burning $50/hour with no alert to wake you up.

myapp.vercel.app/checkout

Card number

4242 4242 4242 4242

Expiry

12 / 27

CVC

424

Pay $49.00

... nothing happens. The button just stops spinning.

console

Access to fetch at 'https://api.myapp.com/checkout' from origin 'https://myapp.vercel.app' has been blocked by CORS policy

03 / 03

The silent integration fail

Bolt's preview environment is different from your production deployment. CORS policies, API base URLs, auth callbacks — things that work perfectly in bolt.new fail the moment a real user hits your live URL. No error shown. Just a frozen button.

Setup

Add DeepTracer to your
Bolt app in 5 minutes.

Bolt already generated your server — you just need to add 3 lines. No YAML. No dashboards to configure. No agents to install.

Add to Bolt's generated server

Find the server.js Bolt created — add these 3 lines at the top.

server.js ← Bolt generated this

// Add at the very top ↓

import DeepTracer from '@deeptracer/node'

DeepTracer.init({ apiKey: process.env.DEEPTRACER_KEY })

// ... rest of Bolt's generated code ...

import express from 'express'

import stripe from 'stripe'

// ...

$ npm i @deeptracer/node

Add your env vars to deployment

While you're here — add all the ones Bolt referenced. This fixes problem #1.

Environment Variables

DEEPTRACER_KEY dt_•••••••••••• NEW

STRIPE_SECRET_KEY sk_live_•••••• FIXED

OPENAI_API_KEY sk-•••••••••••• FIXED

DATABASE_URL postgres://•••• EXISTS

All 3 env var gaps from your Bolt app — fixed.

Your agent watches the gaps Bolt left

Errors, LLM spend, crashes — caught instantly with AI root cause.

Agent active — bolt-app-prod ↑ 3d 6h

GET /api/users 200 12ms

OpenAI spend today: $1.24 ↓ normal

LLM spend spike detected — 42 calls/min

Rate limit missing on /api/chat route

Fix ready — add rate limiter middleware

"The /api/chat route has no rate limiting. A single user triggered 42 OpenAI calls in 60 seconds. Add express-rate-limit before this route."

Works wherever Bolt deploys:

Vercel Netlify Railway Render Any VPS

Pricing

Start free.
Upgrade when you need it.

Most Bolt apps start on the free tier. When you hit your first viral moment — or your first 3am crash — you'll know it's time to upgrade.

Free

Reactive Mode

$0/ month

Forever free. No card required.

Start free — no card

Perfect for a fresh Bolt launch. Catches your first crashes and tells you why — before you check your DMs.

1 Bolt app project

25,000 events / month

Crash & error detection

Env var error capture

3 AI investigations / month

10 AI chat messages / month

1-day retention

LLM cost alerts

24/7 ambient monitoring

Questions from Bolt builders

I'm not a developer — will I understand what DeepTracer tells me?

Yes — that's exactly who we built this for. When something breaks, DeepTracer doesn't show you a stack trace and walk away. It tells you what broke, why it broke, and what to fix — in plain language. Most Bolt builders can copy the suggested fix directly back into Bolt's chat and ask it to apply the change.

Does it work with Bolt's generated Express backend?

Yes. Bolt typically generates an Express server — DeepTracer's errorHandler() middleware slots right in at the end of your route definitions. The SDK also catches unhandled promise rejections and uncaught exceptions at the process level, so even errors Bolt didn't anticipate get captured.

How does it help with LLM costs? My Bolt app uses OpenAI.

DeepTracer tracks every OpenAI, Anthropic, and other LLM API call your app makes — cost, tokens, latency, and which route triggered it. On Pro, you can set spending budgets and get alerted before you hit them. This is the monitoring layer Bolt doesn't include — the AI writes the feature, but DeepTracer watches the bill.

Do I need to redeploy my Bolt app to add DeepTracer?

Yes — you need to add 3 lines to your server file and redeploy. In Bolt, open your project, find server.js, add the import and DeepTracer.init() at the top, then trigger a new deployment. The whole process takes about 5 minutes. Bolt makes redeployment trivial — just click deploy again.

What's the difference between DeepTracer and just checking my logs?

Logs tell you something happened. DeepTracer tells you what happened, why it happened, and how to fix it — automatically. You'd have to manually correlate timestamps, search through stack traces, and guess at root causes. DeepTracer does that investigation for you within seconds of the error occurring, and can send you a Slack message before you've even opened your laptop.

Is the free tier actually useful or just a teaser?

The free tier catches real errors with real AI investigations — 3 per month. For a newly launched Bolt app with a handful of users, that's often enough to catch the critical issues in your first week. The limit exists to nudge you toward Pro once your app has enough traffic to need more coverage, not to make free useless.

Free tier — no card required

Bolt shipped it.
Make sure it stays shipped.

You spent 2 hours building something great. Don't let a missing env var, a runaway OpenAI bill, or a 3am crash undo it. DeepTracer is the production layer Bolt doesn't include.

Start watching your Bolt app free

Add to your Bolt server.js ~5 min

$ npm i @deeptracer/node

import DeepTracer from '@deeptracer/node'

DeepTracer.init({ apiKey: process.env.DEEPTRACER_KEY })

// Your Bolt app is now watched. 🛡

Lovable monitoring · React monitoring · vs Sentry · Pricing

Bolt shipped it in 2 hours. Your first error took 4 minutes.

Bolt builds fast.These 3 things break first.

Add DeepTracer to yourBolt app in 5 minutes.

Start free.Upgrade when you need it.