Everything
Error Hunter Does
One platform. Every coin. Every bill. Every error — known, rare, and brand new.
Here is everything working for you the moment you upload a photo.
We Hunt All Errors.
Known. Rare. And Brand New.
Most tools only recognize errors they've been trained on. Error Hunter goes further. Our AI includes anomaly detection — a layer that flags patterns it has never seen before, including errors that have never been catalogued anywhere. If your coin or bill is off in any way, we will find it. Not just the classics. Not just the famous varieties. Everything.
Every Mint Error
Coins Can Have
From the most common doubled dies to ultra-rare transitional planchet errors — our AI was built to recognize the full universe of mint errors across coins from every country.
- Doubled Die Obverse & Reverse — Duplicated design elements from die misalignment during hubbing
- Off-Center Strike — Coin struck outside its intended position on the planchet
- Wrong Planchet / Transitional Errors — A coin struck on a blank meant for a different denomination or year
- Clipped Planchet — Missing section from the blank before striking
- Die Cracks & Cuds — Raised lines and blobs from a cracked or broken die
- Broadstrike — Struck without the retaining collar, causing a spread-out design
- Die Cap / Brockage — Coin that stuck to the die and became a striking tool itself
- Rotated Die Errors — Obverse and reverse not aligned to the expected angle
- Strike-Through Errors — Foreign material caught between die and planchet during striking
- Machine Doubling, Hub Doubling, Mechanical Doubling — Every doubling category covered
- Mule Coins — Obverse and reverse from completely different coin series
- Plus every anomaly our AI flags that has no existing classification yet
Printing Errors
Bills Never Should Have Had
Paper currency errors are some of the rarest and most valuable finds in all of collecting. Error Hunter is trained on the full range of printing defects across US bills and international banknotes.
- Miscut Notes — Borders off-center or portions of adjacent bills visible
- Offset Printing — Ink from one side bled or transferred to the other
- Gutter Fold — Fold in the paper during printing left an unprinted strip
- Ink Smear & Insufficient Ink — Printing defects that affect ink distribution
- Inverted Overprint — Serial numbers or seals printed upside down
- Missing Print Layers — Entire print runs missing one or more ink passes
- Double Denomination Mules — Two different denominations inadvertently combined
- Star Replacement Notes — Printed to replace defective notes; low-run stars are valuable
- Plus any anomaly our AI identifies that defies existing categories
Your Serial Number
Could Be Worth a Fortune
Error Hunter automatically checks every US currency serial number you enter against every recognized fancy pattern — and tells you what it's actually worth based on real 2024–2025 auction data.
Solid Serials
All 8 digits identical. Roughly 1-in-11-million odds. On $1 bills: $500–$3,000+. On $100 bills: up to $30,000+. We detect every solid pattern instantly.
Ladder Notes
12345678 or 87654321 — one in ~96 million notes. We verify true ascending and descending ladders and surface real sold prices from Heritage Auctions.
Radar & Super Radar
Palindrome serials that read the same forward and back. Super radars are 100× rarer — a 2024 $5 Super Radar sold for $66,000 at Heritage Auctions.
Double Quads
First four digits all match, last four all match (e.g., 11112222). Circulated examples routinely sell for $80–$250.
Repeaters & Super Repeaters
First half repeats as second half. Super repeaters (12121212) and binary super repeaters (01010101) fetch $80–$400+.
Low Serials
Serial #1 has sold for over $26,400. Sub-100 serials in uncirculated condition reach $1,000+. We tell you exactly where your number falls.
Binary Notes
Serial contains only 0s and 1s. Binary super repeaters (01010101) are among the most sought-after patterns, selling for $150–$400+.
Birthday & Calendar Notes
Serial encodes a recognizable date or historical milestone. Historically significant dates (July 4 1776, 9/11, etc.) command strong collector premiums.
Star Notes ★
Replacement notes printed to replace defective bills. Low print-run star notes are increasingly rare and valuable. Ladder + star: up to 10× premium.
Built-In
Weight Verification
No other coin scanning tool does this. When our AI detects a potential wrong planchet, transitional error, or mule — we instantly surface a Weight Verification Tool right inside your results.
Enter your coin's weight from a jeweler's scale and we run three simultaneous checks to confirm or rule out the error.
- Official Mint Tolerance Check — Compare against exact published specs for coins across multiple countries
- Specific Gravity / Metal Density Test — Identify the actual metal composition using water displacement math
- PCGS / NGC Authentication Guidance — Instant recommendation on whether to submit and to which service
- Pass / Fail / Inconclusive verdict — Clear outcome so you know exactly what you're holding
Live Scan Mode
Point your camera at any coin or bill and get real-time AI analysis on screen — no upload, no wait, no guessing. Built for high-volume hunters who move fast.
Real-Time Camera Analysis
Live feed fed directly into the AI engine — results update as you move the coin in frame. No manual capture needed.
Zero Wait Time
Designed for coin show buyers, estate sale hunters, and roll searchers who need instant decisions without breaking their workflow.
Continuous Scanning
Stay in Live Scan mode for your entire session. Work through a roll, a bag, or a dealer tray without restarting the app.
Every Scan Gets a Verdict
We don't just hand you AI confidence scoring and leave you guessing. Our decision intelligence layer cross-validates multiple AI engines and assigns a clear verdict to every scan — so you always know your next move.
PASS
All signals agree — no error detected. Safe to move on.
CAUTION
Something looks off. Check a second image or use the weight tool before deciding.
REVIEW
High probability error detected. Submit to PCGS or NGC before listing or selling.
UNSURE
Signals conflict. A better photo or physical inspection is recommended.
Built for the Whole World
Nov8 Software Developers, LLC built a global-scale dataset covering coinage and currency from over 170 countries — not just the United States. This is not a US-only tool. It is a worldwide error-detection system built for international collectors and dealers.
Start Free. Scale When You're Ready.
4 free scans to get started. No card required. Unlock more when you're ready.
- 5 scans
- AI screening
- AI confidence scoring
- Value estimate
- Weight verification
- 200 scans / month
- Full AI screening
- AI confidence scoring
- Full price database
- Scan history
- Weight verification
- 1,200 scans / year
- Live scan mode
- Full AI screening
- Market trend pricing
- Priority processing
- Weight verification
Nov8 Software Developers, LLC
The Hunt Starts
Right Now
Three free scans. No credit card. No commitment.
Just upload a photo and let the AI go to work.