/slash-tokens

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).

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.

npm install slash-tokens

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:

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

Then bunx slash-tokens, get a key ($20 on the house), or Team — $39 for the data.

Dashboard

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

Full docs, examples, and model pricing at GitHub

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.

🏎️ Don't go to the Corner Shop in a Ferrari. · slashtokens.com