Built by Flippers, for Flippers

Start Flipping! Know the Real Value.

Real web search data from eBay, Amazon, and 20+ sources.
100% Free BYOK - Bring your own API key. You control cost, quality & privacy.
No servers. Your data never leaves your browser.

Get The Advantage Watch Demo

Est. Profit +$245.00

Demand High

Listing Price $600.00

Deal Score 98/100

Scam Risk Low

Market Value $845

Why We're Different

Manual research is slow. Other tools are expensive & inaccurate.

The Old Way

✗ Manual research - hours wasted per item
✗ Stale databases - outdated prices = bad decisions
✗ Privacy nightmare - your data sold to third parties
✗ $10-50/month - subscriptions that bleed you dry

SecondFish

✓ Live web search - real sold prices from 20+ sources
✓ 100% local - your data never leaves your browser
✓ Free forever - BYOK means you pay pennies (or nothing)
✓ 30+ metrics - profit, demand, scam risk & more

How It Works

Our 3-stage AI pipeline delivers unmatched accuracy.

Product Extraction

AI extracts and normalizes product details from messy marketplace listings. Identifies brand, model, condition, and category with precision.

Fast Model (Low Cost)

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Market Research

Web search scans eBay, Amazon, and category-specific platforms for actual sold prices. Real data prevents AI hallucinations.

Web Search Enabled

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Deal Evaluation

Powerful AI combines all data for comprehensive scoring. Conservative analysis with stress-testing ensures reliable recommendations.

Powerful Model (Best Quality)

Why 3 calls instead of 1? Prompt chaining with specialized stages produces 15.6% more accurate results than monolithic prompts. Each stage has a focused task, preventing errors from compounding.

Real Data. Real Accuracy.

We don't guess. We search the entire internet for actual market prices.

Data Sources We Search

Electronics & Tech

eBay Sold Amazon CamelCamelCamel Swappa Best Buy

Fashion & Luxury

Poshmark Grailed StockX GOAT TheRealReal

Vehicles & Parts

Kelley Blue Book CarGurus Edmunds RockAuto AutoTrader

Collectibles & More

Chrono24 Reverb TCGPlayer Discogs PriceCharting

Category-specific searches ensure you get the most relevant pricing data for any item type.

30+ Metrics Per Listing

The most comprehensive deal analysis available. Period.

Pricing Intelligence

Market Value Range (P25/Median/P75)
New Condition Retail Price
Recommended Buy Price Range
Estimated Profit (Low/Mid/High)
ROI Percentage
Profit Margin %
Depreciation Rate

Deal Scoring

Overall Score (0-100)
Confidence Level (Low/Medium/High)
Recommendation (Buy/Negotiate/Avoid)
Price Advantage Score
Profit Potential Score
Risk-Adjusted Score

Demand Analysis

Demand Velocity (Fast/Moderate/Slow)
Seasonality Impact
Estimated Days to Sell
Category Trends
Regional Market Factors

Risk Assessment

Seller Trust Score (0-100)
Scam Risk Level
Market Volatility Score
Authenticity Verification
Counterfeit Risk Flags
Red Flag Detection

FAQ

Quick answers. No fluff.

How do I get started?

3 steps: 1) Install the extension. 2) Connect with OpenRouter (free signup, add some credits). 3) Browse Facebook Marketplace like you always do - click items, we do the rest. That's it. No PhD required.

What's BYOK and why should I care?

BYOK = Bring Your Own Key. You use your own OpenRouter API key. Why? You control costs (pennies per analysis), privacy (we never see your key), and quality (pick any AI model you want). No subscriptions. No middleman.

Is it really free? What's the catch?

No catch. We built this for ourselves because we got tired of overpaying for garbage tools. We have zero servers = zero costs = nothing to charge you for. You only pay OpenRouter directly for AI usage (typically <$1/month).

Is my data safe?

We literally can't see your data. Everything runs in your browser. No servers, no tracking, no analytics. Your API key lives in Chrome's secure storage. We couldn't spy on you even if we wanted to (and we don't).

How accurate is this thing?

Unlike tools using dusty databases from 2019, we do live web searches on eBay sold listings, Amazon, CamelCamelCamel, and 20+ sources. Real-time data = real accuracy. No crystal balls, just actual market prices.

How much does each analysis cost?

Budget models: fractions of a cent. Premium models (GPT-4): 1-5 cents. Most flippers spend under $1/month. That's less than a bad cup of coffee. You'll make it back on your first flip.