The Collector's Intelligence Platform
The Intelligence platform for collectors who refuse to settle. Search eBay across 15 countries in 8 languages. Track your collection. Verify authenticity. From $9.99/month.
Free to start · No credit card · Mac & iPhone apps coming soon
Authentication by ScreenGrade
See verdicts on every signed listing as you browse. No uploads, no waiting. Powered by ScreenGrade. Props, costumes, and production art categories coming soon.
Authenticators reference verified exemplars from major auction houses. Currently across film, television, and streaming. exemplars added as authenticators encounter them.
Quick returns a six-state verdict in 24 hours for $8. the default for most pieces. Rush (9am–8pm PT) moves yours to the front of the queue and returns in 2 hours for $12. outside those hours your piece queues at 9am Pacific. Deep adds extended exemplar review across a 3-day window for $20, when the piece warrants the extra read. Same authenticator, same verdict canon. you choose the speed and depth.
An entertainment-vertical authenticator reviews your signature against the signer’s hand on file, paper, ink, and the signing era. then anchors the opinion to a certificate number on the record. Currently across film, television, and streaming, with the exemplar library expanding as authenticators encounter new signers.
Built for collectors who need a real opinion on the record. not a sticker on a piece of paper. Every certificate is anchored to independent third-party records the moment it is issued.
Three Steps
Search signed collectibles on eBay through Grail Den
See verdicts on every signed listing on every listing. Powered by ScreenGrade
Know what's real before you spend
Your Arsenal
Every module built for obsessive collectors who demand precision, speed, and an unfair advantage.
Grail Den translates your search into 8 languages, searches 15 international marketplaces simultaneously, converts every price to your currency, and surfaces items most collectors never see.
15 Marketplaces · 8 Languages · Auto Currency Conversion
Catalog every piece with photos, provenance chains, and condition grading. Track value over time. Generate underwriter-ready replacement-value appraisals. Know your collection's true worth, always.
Value Tracking · Replacement-Value Appraisals · Provenance Chains
Our authenticators calculate value from sold-comp data across major auction houses and marketplace history. Real prices anchored to recent transactions, not list prices.
Authenticator-Calculated Value · Live Auction Tracking
Send Through-The-Mail (TTM) requests to celebrities, athletes, and public figures. Pro subscribers unlock the full curated address index for planning campaigns with confidence.
Pro: 201K+ Addresses · Always UpdatedGlobal Advantage
Your search, translated instantly. “Star Wars signed photo” becomes “Star Wars signiertes Foto” on eBay Germany, “Star Wars photo signée” on eBay France, and “Star Wars foto autografada” on eBay Spain. Over 1,100 collecting terms are protected so franchise names and key terminology stay accurate across every translation.
Most collectors only search eBay.com. They’re missing 14 other eBay marketplaces full of items listed in local languages at local prices. A prop that sells for $800 in the US might be listed for €400 on eBay Italy. if you can find it. Grail Den searches them all at once.
Every result shows the price in your currency automatically. No mental math, no googling exchange rates. See a lightsaber hilt on eBay UK for £350? You’ll see $440 right next to it. Compare across borders as easily as across the street.
The Scholar's Edge
Pro features that give you an unfair advantage in the hunt.
Submit a photo or eBay link. A credentialed entertainment-vertical authenticator examines the signature against signer exemplars on file, weighs era and signing context, and issues a six-state opinion on the record. Quick (24h), Rush (2h, 9am to 8pm PT), or Deep (3 days, with pen, signature condition, and item condition analysis). Multi-signed pieces priced per name.
Not all sold comps are equal. Statistical filtering separates outliers from true market signals, so you see the real price, not the noise.
Bulk import your collection from eBay purchase history or CSV. Cross-references databases, fills in details, and builds your catalog automatically. Hours become minutes.
What Hunters Seek
Whatever you collect, Grail Den speaks your language.
Choose Your Path
Start free. Upgrade when the hunt demands it.
Free
Start free. Browse and translate the global hunt.
Collector
$99.90/year. save 17%
The serious collector's daily edge. Visual search, TTM, lower fees, beta features.
Pro
$149.90/year. save 17%
Everything in Hunter, with no collection cap and the lowest marketplace fee on the platform.
In development. Hunter & Scholar see it first
Active build queue. Hunter and Scholar subscribers get beta access the moment each ships. We list these here so you know what's real and what's coming. not as a feature you're paying for today.
Live aggregate market value of your entire collection. The single number for insurance riders, estate planning, and sale-decision moments.
Statistical outlier removal on sold-comp data. Median, not average; rejects the warped "recent sales" you see on every other listing site.
Below market / At market / Above market on every listing. comp-backed, deterministic, transparent. No black-box AI scoring.
Surface signers with significant price trajectory shifts (% rise or dip over 30/90 days) so you act on movement, not noise.
À la carte deep-dive comp analysis on a specific item before you commit money. Available to all tiers when shipped. pricing announced at launch.
Documentation-grade Documentation-grade PDF for underwriting, estate planning, sale negotiations. À la carte; no subscription bundle. Pricing announced at launch.
Expert signature authentication by ScreenGrade. More collectible types launching soon. No subscription required.
Credits never expire. Scholar members get 5 free credits every month.
The Den Awaits
Hunt smarter. Collect with confidence. Never overpay.
Enter the DenField Notes
The truth about fake COAs and "premiere signed" memorabilia. Those hologram stickers are worth less than the paper they're stuck on.
ReadAuto-pen machines produce convincing signatures that fool most collectors. Learn the telltale signs.
ReadThat "signed" movie poster might just be a print. How to identify press-signed autographs vs the real thing.
ReadIndependent verification
Every Screen Grade certificate carries a cryptographic fingerprint anchored to a free, public timestamping service at the moment of issue. And aggregated into the Bitcoin blockchain shortly after. Anyone can verify the anchor independently, without trusting our database.
A cryptographic fingerprint of the certificate, anchored to the Bitcoin blockchain. Tamper-evident. Alter the document and the proof breaks. Verifiable independently.
Additional anchors (decentralized storage, secondary chains) are on our roadmap and will be added retroactively to existing certificates when they ship.
ScreenGrade is a working bench of entertainment-vertical authenticators. The verdict is an opinion on the record, anchored by a certificate number. For high-value items ($2,500+), we recommend pairing with PSA, JSA, Beckett, or SWAU certification.
