spend drift

Prove a cheaper model is safe. Then keep the saving.

Cost replays your real traffic against a cheaper model, has an independent judge score every answer across five dimensions, and surfaces the switch only once the cheaper model matches on 95% of them. The failures are listed. You apply the change, and you keep every euro it saves.

An agent in production drifts three ways: what it costs, whether it is still right, and whether it is safe. Cost measures the first. The other two.

Work out your bill

$npm install @botzone/cost-sdk

Metadata only by default. Prompts and responses stay in your network unless you turn on body capture for a route. Open-source SDK, EU-hosted. Free under €2,000 a month of model spend, no card. Source on GitHub →

Anthropic/OpenAI/Gemini

Open-source SDKEU-hostedMetadata only by defaultContent-free audit trail

cost.botzone.ai / myapp

Demo data

Today

€4.82

+12% vs yesterday

Last 7 days

€34.91

€18/mo projected saving, verified

Top route

chat:reply

€18.20 · 52% of spend

Spend, last 24h

EUR · UTC

By route

chat:reply€18.20
summary:thread€7.40
classifier:intent€4.90
embed:search€2.60
other€2.20

Preview · seed data

One call. Three providers.

Wrap your client. That's the whole SDK.

Auto-detects Anthropic, OpenAI, and Gemini. The SDK is out of band, so it does not add a network hop to your request. Tag every call with a route and Cost does the rest.

import Anthropic from "@anthropic-ai/sdk";
import { wrap } from "@botzone/cost-sdk";

const anthropic = wrap(new Anthropic(), {
  apiKey: process.env.COST_API_KEY,
  route: "chat:reply",
});

// Use it exactly like before. Cost attributes every call.
const response = await anthropic.messages.create({
  model: "claude-sonnet-4-7",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

How it works

Three steps. Two minutes.

01
Install
Pull the SDK into the service that calls Anthropic, OpenAI, or Gemini.
```
npm install @botzone/cost-sdk
```
02
Wrap your clients
One call. The SDK auto-detects the provider and forwards every request unchanged.
```
const ai = wrap(new Anthropic(), { route: "chat:reply" });
```
03
See where the money goes
Open the dashboard. Spend attributed to routes and features, with verified-safe downgrade suggestions ready to apply.
```
cost.botzone.ai/projects/myapp
```

The three pillars

Prove. Attribute. Cut.

Verified-safe downgrades

When a cheaper model can do the job, Cost shadow-runs it on your real traffic and has an independent model grade every answer. You only see the switch once it is proven safe, and the risky cases stay on the premium model.

Per-route attribution

Tag every call with a route or feature. The dashboard tells you which prompts are burning your budget.

Three SDKs, one ledger

Anthropic, OpenAI, Gemini. TypeScript and Python. One wrap call, every euro accounted for.