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Sales & Revenue Opsexpert · ~240 min

The Price You'll Honor — A Self-Serve Instant Quote Where the AI Never Touches the Number

What is the actual cost of putting an AI on your website and letting it tell a stranger what your work costs?

Not the API bill — the quote it invents at two in the morning, that the customer screenshots, and that you now get to either honor or argue about. This project builds the opposite of that: a public instant-quote widget where AI does the one job it is genuinely good at (understanding what a person typed) and is structurally prevented from doing the one job it must never do (deciding what you charge).

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The Price You'll Honor — A Self-Serve Instant Quote Where the AI Never Touches the Number
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What you'll do

A live, public instant-quote endpoint you own end to end: an owner-editable price book in integer cents that is the single source of every number, a pure arithmetic engine with golden tests that runs with no model involved, a Claude tool schema generated from that price book so the model can only choose service codes that actually have prices and has no field to write money into, a fail-closed handler that routes to a human whenever the model declines, hedges, or fails to return a structured call at all, a deterministic refusal ladder that keeps site-visit and out-of-area jobs away from instant pricing entirely, HMAC-signed quote records so a customer cannot edit their own total and a price change tomorrow cannot rewrite what you promised today, Turnstile plus a rate limit that you personally attack with curl before trusting, an adversarial prompt corpus proving that no amount of "my friend got 90% off" changes a single cent, a cost model built from your own token counts with prompt caching on the price-book prefix, and a nightly canary that re-prices a golden basket and tells you when your own numbers have drifted.