# /slash-tokens

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Token Optimization for Context Engineers.
For anyone building with LLMs. 4.8 KB WASM. Sub-millisecond. Zero dependencies.

Know the cost before the call leaves your machine.

Models change. Windows grow. Slash adapts — you keep building.
Cheaper tokens haven't shrunk the bill — usage has.

## v1.6.5 — The Fixed Deal Edition

Solo $20 mailbox, 10% waived. Team $39 for the data.

**Free forever is bunx** — no account. A one-person account is email → key, **$20 on the house**. We show the savings. We don't charge. 10% is the model, waived. Team is **$39 for the data** (`$390`/year).

```bash
bunx slash-tokens
# or: npx --yes slash-tokens
```

Run it in a project that already calls an LLM. An empty folder prints that nothing was found — that's normal.

```bash
npm install slash-tokens
```

```js
import { preflight, preflightRoute } from 'slash-tokens'

// Analysis — cheaper alternatives across all providers. Not a route.
const check = preflight(prompt, 'claude-opus-5')
check.tokens
check.cost
check.fits
check.options

// Routing decision — same-provider only, matches the Slash proxy
const route = preflightRoute(prompt, 'claude-opus-5')
// { model: 'claude-haiku', cost, salvaged, salvagePercent } or null
```

Or one line — every LLM call checked pre-call:

```js
import 'slash-tokens/auto'
```

Intercepts `fetch()` to Anthropic, OpenAI, xAI, and Google. Estimates before the call leaves your machine. Same-provider cheaper swap if one fits.

## See it work

A live chat with every call through the gate: [live demo](https://slash-nextjs-wofejams-projects.vercel.app)

Then `bunx slash-tokens`, [get a key](https://mcpaas.live/slash/setup) ($20 on the house), or [Team — $39 for the data](https://slashtokens.com).

## Dashboard

Track savings across all your apps. One-person key (email, $20 on the house) at [mcpaas.live/slash/setup](https://mcpaas.live/slash/setup)

Full docs, examples, and model pricing at **[GitHub](https://github.com/Wolfe-Jam/slash-tokens)**

## License

**Code: MIT.** Fork it, ship it, change it, show it, share it, sell it.

**Brand: reserved.** The slash-tokens name, ⚡ mark, and red/gold colors stay with the project. If you're building on top of the SDK, ship under your own name and colors — don't represent your app as Slash. See [NOTICE](./NOTICE).

---

🏎️ *Don't go to the Corner Shop in a Ferrari.* · [slashtokens.com](https://slashtokens.com)