Track used car prices across dealers and private sellers, showing price trends and best deals by make and model. Research listings from CarGurus, AutoTrader, and Facebook Marketplace to find underpriced vehicles before anyone else does.
Build Prompt
Copy this prompt into Claude Code
Build a static HTML used car price tracker. Dark theme: background #0a0a0f, surfaces #12121a, borders #1a1a2a, accent #0ea5e9 (sky blue). Data from inline JS constants:
const CARS = [...] — each entry: id, year, make, model, trim, mileage, price, marketAvgPrice, dealScore ("great"/"good"/"fair"/"overpriced"), source ("CarGurus"/"AutoTrader"/"FB Marketplace"/"Private"), sourceUrl, location, daysListed, color, transmission, fuelType, accident (bool), images (emoji array).
const MAKES = ["Toyota","Honda","Ford","Chevrolet","BMW","Tesla"] — filter tabs.
const PRICE_HISTORY = { "make-model": [{date, avgPrice}] } — 90-day rolling average for sparkline charts.
const LAST_UPDATED = "2024-01-15T08:00:00Z".
Layout: sticky header with site name and last-updated badge. Make/model filter tabs, year range slider (2015–2024), max price input, mileage cap dropdown. Car grid (3 cols desktop, 1 mobile): card showing photo emoji, year/make/model, mileage, price in large text, market avg with diff (e.g. "$1,200 below market"), deal score badge (color-coded), source badge, location, days listed. Clicking card opens modal: full specs table, inline SVG price history sparkline for that model, "View Listing" CTA. Sort bar: Best Deal, Lowest Price, Lowest Miles, Newest. Stats strip: total listings, avg price, median price, price trend arrow. Footer: "Prices updated every 12 hours by AI agent".
Seed 18 sample listings across 6 makes. Include inline SVG sparkline renderer using the PRICE_HISTORY data.
Add cron setup comment: <!-- Schedule: Run 'claude -p "Research current used car listings for [make/model] in [city]. Update CARS array with fresh listings and recalculate PRICE_HISTORY averages. Redeploy."' via crontab every 12 hours -->
Read the guide at https://accessagent.ai/api/guide and follow it to deploy the site to AccessAgent.ai. My email is [your@email.com].
Make It Yours
Target Make/Model
Narrow the tracker to one model — e.g. Toyota Tacoma only — for laser-focused deal hunting.
Deal Score Weights
Adjust scoring to prioritize low mileage over price, or penalize accident-reported vehicles more heavily.
Price History Charts
Extend PRICE_HISTORY to 180 days and render full SVG line charts with min/max annotations.
Regional Filters
Add a state/region dropdown so buyers can find deals within driving distance of their location.
Depreciation Calculator
Show estimated value in 3 years based on historical depreciation curves for each make/model.
VIN Lookup Badge
Flag listings that include a VIN with a "History Available" badge linking to free VIN check tools.
Update Prompt
Update Prompt — Re-research and refresh listings
Re-research used car listings for [make/model] in [city/region]. Check CarGurus, AutoTrader, and Facebook Marketplace for new listings under [max price]. Update the CARS array with fresh finds, remove sold listings, recalculate PRICE_HISTORY rolling averages, and update LAST_UPDATED. Redeploy.
SEO Tips
Target "[year] [make] [model] price" and "used [make] for sale [city]" — high-intent buyer searches with strong conversion.
Add JSON-LD Vehicle schema for each listing with mileageFromOdometer, vehicleModelDate, and offers price.
Create separate pages per make/model combo — "used-toyota-tacoma-prices" ranks well with thin competition.
Include a "Fair Price Guide" section with average prices by year and trim — earns featured snippet placement.
Add user-submitted "I bought this" stories linking back from car forums for powerful niche backlinks.
Monetization Ideas
Auto loan affiliate links (LendingTree, myAutoloan) — earn $20–$80 per funded loan from deal-seekers.
CarFax or AutoCheck affiliate integration — badge listings with "Get History Report" for $5–$10 commission per report.
Extended warranty upsell links from iDeal Auto Protect or CARCHEX on high-mileage listings.
Sponsored "dealer spotlight" placements for local dealerships wanting premium visibility in the tracker.
Premium email alerts subscription — users pay $3/month to get notified instantly when a great deal appears.