Know Before You Bid

BidWiser deep dives into eBay listing and seller details, turning hundreds of minutes of research into seconds.

3 free scans for new visitors. Create a free account for 20 scans/month.

BidWiser Shield

What Red Flags Will You Find?

What BidWiser Analyzes

Seller Analysis

Feedback patterns, response quality, registration age, and volatility signals.

Listing Inspection

Description quality, return policies, shipping costs, and missing details.

Photo Analysis

Completeness score, stock photo detection, watermarks, and missing proof shots.

Red Flag Detection

Origin concerns, price anomalies, authenticity risks, and complaint patterns.

How It Works

1

Paste the URL

Enter any eBay listing URL or item number above.

2

AI Analyzes

Our AI reviews 80+ data points from eBay's API.

3

Get Your Report

Receive reliability scores and detailed findings.

eBay Developers Program Member

Proud eBay Certified Developers

BidSlammer has been an official eBay Developers Program member since its inception in November 2000. With over 25 years of experience building tools for eBay buyers, we know the platform inside and out. BidWiser is built on that expertise.

See It In Action

Dashboard View
Analysis Report
Score Breakdown
Photo Analysis

What Are You Picky About?

Whatever your usual routine for reviewing listings, tell us! We'll save you the tedious work. We already review several hundred eBay fields, but premium users can customize their analysis.

Your Custom Prompt

"Check if seller responds defensively to negative feedback"

Sensitivity Control

Conservative to thorough - you control how picky we are.

Premium Feature

Upgrade to customize your analysis workflow.

Frequently Asked Questions

What is BidWiser?
BidWiser is an AI-powered tool that analyzes eBay listings to identify potential red flags, seller concerns, and listing quality issues before you bid. It reviews 80+ data points including seller feedback patterns, listing details, photos, and shipping/return policies.
How much does it cost?
New visitors get 3 free scans. Create a free BidSlammer account to get 20 scans per month. Premium plans start at $36.99/year for 500 scans per month, plus you get 20 free snipe wins! When you upgrade, you're becoming a BidSlammer subscriber with access to all our tools.
What eBay fields does it analyze?
We analyze seller feedback score, positive percentage, registration date, response patterns, item condition, description quality, return policy, shipping costs, dispatch time, photo count, location, category-specific attributes, and much more. Premium users can also add custom analysis criteria.
Can I customize my analysis?
Yes! Premium users can add their own custom prompt (up to 1,000 characters) to specify exactly what they want us to check. You can also adjust the sensitivity level from conservative (only serious issues) to thorough (catch everything).
Do you support ChatGPT Vision for photo analysis?
Yes! ChatGPT Vision can analyze listing photos to detect stock images, watermarks, missing proof shots, and condition mismatches. Vision analysis costs 1¢ to 3¢ per image via OpenAI, which adds up quickly for heavy users. You can use your own OpenAI API key to pay for Vision directly, while we handle everything else. We track your usage and let you set a spending cap so you won't get surprise bills.
Can I use my own ChatGPT API key?
Yes, for Vision (photo analysis). You pay our base subscription fee for text analysis, and can optionally provide your own OpenAI API key to pay for Vision calls directly. This is ideal for power users who analyze many listings with photos. We track your usage in real-time and let you specify a monthly spending cap, so you stay in control of costs.
Who made BidWiser?
BidWiser is made by BidSlammer, trusted eBay developers since 1999. We were among the first developers in eBay's certified developer program with over 25 years of experience building tools for eBay buyers.
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Before You Go...

Create a free account to unlock 20 listing scans per month and protect yourself from bad purchases.

Free Account Includes:

20 BidWiser scans per month
1 free snipe to try BidSlammer
Save your analysis history
No credit card required