The Collector's Intelligence Platform
The Intelligence platform for collectors who refuse to settle. Search eBay across 14 countries in 8 languages. Track your collection. Verify authenticity. Free to start — paid tiers from $9.99/month.
Free to start · No credit card · Web, Mac, and iPhone
Authentication by Screen Grade
Expert verdicts from working authenticators — Quick in 24 hours, Rush in 2. Powered by Screen Grade.
Authenticators work from verified exemplars sourced from major auction houses — currently spanning film, television, and streaming. The library grows as new signers come through.
Understand what you’re buying and what it’s actually worth. Valuations draw on documented sold comps from major auction houses and live marketplace data — so you can read the market before you spend.
A working authenticator with deep experience in entertainment autographs reviews your signature against the signer’s hand on file, paper, ink, and signing era, then issues a numbered opinion. The exemplar library currently covers film, television, and streaming, and grows as authenticators encounter new signers.
Built for collectors who want documented evidence, not a sticker. Every opinion has its own opinion number. Share it, and anyone can confirm a Likely Authentic, Inconclusive or pre-print opinion. Likely Not Authentic opinions are delivered to you in full, in your account.
Higher tiers cite more evidence. The full written opinion is included at every tier (elsewhere a documentation letter is a $20 add-on). And the fee is the same whatever the verdict: we would rather leave money on the table than fake certainty. Every opinion stands on its evidence.
For bidding and pre-purchase triage: a fast photo-based opinion for marketplace decisions. Bid, pass, ask for more photos, or escalate to Deep.
The same expert opinion, in the bidding window. Typically within 2 hours (7am to 8pm PT, seven days a week).
The full work-up. For grails and high-value pieces.
A tight value range from comparable sales. Add it to a submission to answer "should I bid?"
Valuation, not a USPAP appraisal or insurance policy. For tax, court, or insurance-claim use, consult a licensed appraiser.
| Tier | Price | Turnaround | What's included |
|---|---|---|---|
| Quick | $9 / item | Typically within 24 hours | Full written opinion, its own opinion number |
| Rush | $15 / item | Typically within 2 hours (7am–8pm PT, seven days a week) | Everything in Quick, at the front of the queue |
| Deep | $20 / item | Typically within 3 days | Extended exemplar review, era and signing context, substrate and provenance notes |
The full written opinion is included at every tier, never an add-on. Inconclusive is a real result: if it was due to photo quality, you get one free resubmit within 14 days.
Multi-signed pieces · what to know
First signature is the tier price; each additional signature on the same piece is +$3. One submission, one opinion number, one record: every name listed gets its own opinion on file.
Multi-signed pieces often carry a mix of authentic and inauthentic signatures, so naming each one lets the authenticator be precise.
Forgot a name on the first pass? Resubmit at the same per-additional rate.
Three Steps
Search signed collectibles on eBay through Grail Den — one search across eBay’s world markets, in your language
Submit any signed listing for an expert verdict from a working authenticator. Powered by Screen Grade
Know what's real before you spend
Your Arsenal
Every module in the Den, built for obsessive collectors who demand precision, speed, and an unfair advantage. Your Den dashboard, in-app messages, and the resources library tie them together.
Grail Den translates your search into 8 languages, searches 14 international marketplaces simultaneously, converts every price to your currency, and surfaces items most collectors never see.
14 Marketplaces · 8 Languages · Auto Currency Conversion
Catalog every piece with photos, provenance chains, and condition grading. Track value over time. Generate insurance reports from your own replacement values. Know your collection's true worth, always.
Value Tracking · Insurance Reports · Provenance Chains
Values come from sold comps across major auction houses and marketplace history, with a signer database of 3,000+ names behind every lookup. Real prices anchored to recent transactions, not list prices.
Value from sold comps · 3,000+ signers · Live auction tracking
Send Through-The-Mail (TTM) requests to celebrities, athletes, and public figures. Scholar members unlock the full curated address index for planning campaigns with confidence.
Scholar: 201K+ Addresses · Always Updated
List and sell to collectors who already know what they are looking at. You stay the seller of record; Grail Den takes 8.5% of the sale as the standard commission, 7.0% for Hunters, 6.0% for Scholars. Every listing can carry a Screen Grade opinion, and the Sales Tracker keeps inventory, the sales ledger, and the profit center in one place.
Direct sales · Sales Tracker · Profit Center
17,000+ signing events on record, refreshed daily from the convention circuit. Watch a signer's name and get an in-app alert when they are announced at a show or signing. Hunter and up.
17,000+ signing events · Daily refresh · In-app alerts
Track consignments and private sales end to end: the deal, the partners, the payments, and a ledger that actually closes. Proposals go out from the tracker and land as deals when they are accepted. Scholar tier.
Deals · Payments · Ledger · ProposalsGlobal 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 autografiada” on eBay Spain. In the Mac and iPhone apps, a glossary of over 1,100 protected collecting terms keeps franchise names accurate in every translation.
Most collectors only search eBay.com. They’re missing 13 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 working authenticator with deep experience in entertainment autographs examines the signature against signer exemplars on file, weighs era and signing context, and issues a documented opinion. Quick (24h), Rush (2h, 7am 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. 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%
Member marketplace fee discount on every physical-goods sale. Plus tools to help you find and document pieces.
Pro
$149.90/year, save 17%
The lowest member marketplace fee on the platform for physical-goods sales. Plus all Hunter tools, with no vault cap.
The Den Awaits
Hunt smarter. Collect with confidence. Never overpay.
Enter the DenIndependent verification
Likely Authentic and Inconclusive opinions carry a cryptographic fingerprint submitted to a free, public timestamping service within seconds of issue, then aggregated onto the Bitcoin blockchain within about a day. The anchor can be verified independently — without our database, and without us.
A SHA-256 fingerprint of the opinion letter, anchored to the Bitcoin blockchain. Alter the document and the proof breaks — verifiable independently, without trusting us.
Screen Grade is a working bench of authenticators with deep experience in entertainment autographs. Opinions are the authenticator’s expert judgment, not a guarantee of authenticity. For high-value items ($2,500+), we recommend pairing with PSA, JSA, Beckett, or SWAU certification.
