1952 Topps Mantle PSA 4ISO $89,250 ▲
Luka Dončić NT RC /99ISO $9,000 ▼
2025 Topps B&W Griffey Jr.ISO $79 ▲
Charizard PSA 10 Base SetISO $12,000 ▲
Ohtani Topps Chrome Gold /50ISO $2,200 ▼
Roman Anthony 2026 Topps HeritageISO $3.25 ▲
Elly De La Cruz Shimmer /75ISO $890 ▲
Mike Trout 2011 Update RCISO $14,200 ▲
1952 Topps Mantle PSA 4ISO $89,250 ▲
Luka Dončić NT RC /99ISO $9,000 ▼
2025 Topps B&W Griffey Jr.ISO $79 ▲
Charizard PSA 10 Base SetISO $12,000 ▲
Ohtani Topps Chrome Gold /50ISO $2,200 ▼
Roman Anthony 2026 Topps HeritageISO $3.25 ▲
Elly De La Cruz Shimmer /75ISO $890 ▲
Mike Trout 2011 Update RCISO $14,200 ▲
Real Buyers · Live Demand · Right Now

Demand Your Grail

GRAILISO

Post the card you want. Set your price. Sellers with that exact card come to you — verified and protected every step of the way.

Now accepting alpha testers — platform launches Q2 2026.
$15B+Annual Card Market
∞Grails Being Hunted
0Platforms That Let Buyers Set The Price
GrailISO is here to change that.
System Compromised
The Problem

The Hobby Is Broken.

Every platform is built for sellers. You scroll, you search, you wait. Nobody builds for the buyer — until now.

🏪
The Big Marketplaces
High fees, limited authentication, and slow dispute resolution. These platforms are built to move volume — not to protect what you're buying.
🔬
One Company. Three Labels.
Three of the most recognized names in card authentication are controlled by a single private equity firm — roughly 80% of the market sits under one roof. You're not choosing between competitors. You're choosing between labels on the same shelf.
⏳
Supply First. You Wait.
Every platform waits for a seller to list first. The card you're looking for could be sitting in someone's collection right now. No platform on earth can tell them you want it.
📉
Yesterday's Prices
Historical comps show what sold last quarter — not what someone is willing to pay for that card today. That's not a market. That's an archive.
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GrailISO flips the entire model. Buyers post what they want and set their price. Sellers see real demand and what collectors are actually willing to pay — no guessing, no lowball offers. The right card finds the right buyer, verified and protected every step of the way.
The Process

From ISO To Display Case.

Eight stages. Five biometric scans per ownership transfer. The card never goes directly from seller to buyer — it routes through the ISOHub for full verification, biometric capture, and chain of custody.

1
Discovery
ISO Posted
Buyer searches the ISOVault, finds the card, sets a price. The ISO goes live on the demand board — visible to qualified sellers in real time.
Buyer · Demand Posted
2
Match
Seller Responds
Seller uploads a pic of their card to GrailISO matching the ISO, then agrees to the buyer's market rate. Buyer reviews the listing and locks the deal.
Seller · Listing + Price Lock
3
Escrow
Transaction Starts
Buyer's payment moves into Stripe escrow. Deal is locked. Funds release only on verified delivery — full refund on rejection. The Hub takes over from here.
Stripe Connect · Escrow Funded
4
Authentication
C2PA Verified Capture
Seller submits a live in-app capture signed with the Content Authenticity Initiative (C2PA) standard. The image is cryptographically sealed at the moment of capture — device, timestamp, and pixels all signed. Screenshots break the signature. Reused photos break the signature. Tampering breaks the signature.
SAC · CAI / C2PA Signed
5
Outbound
Protected Container Ships
ISOHub sends a tamper-evident, fully tracked container to the seller. WWAN-tracked shipping label active from pickup. Tamper detection triggers automatic return.
WWAN Tracking · Tamper Sensor
6
Verification
Hub Receives + Biometric Capture
Card arrives at the ISOHub. Multi-camera capture under controlled lighting. A biometric fingerprint is generated from inherent paper fiber, print dot, and edge cut patterns — unique to that card forever.
HAC → CPC · Hub + Canonical Capture
7
Approval
Buyer Approves
Verification report, biometric capture, and condition map delivered to the buyer. Approve and escrow releases instantly. Reject and you get 100% back — no questions asked.
Buyer · Final Sign-Off
8
Settlement
Seller Paid · Card Shipped
Funds release to the seller the moment the buyer approves. Card sealed in a protective holder linked to its canonical biometric identity, then shipped to the buyer with full provenance chain.
PRVC · Post-Release Verification
Protection

Every Side. Every Step.

Other platforms protect the transaction. GrailISO protects the card, the buyer, and the seller — separately and completely.

Buyer Protection
Payment only released on verification of card. Full verification report, condition map, and high-resolution biometric capture before you approve. 100% money back if anything's not right. No photocopied images — see what you're truly buying.
Seller Protection
Hub confirms the card is authentic — buyer cannot cancel after approval. Funds release the moment the buyer signs off. No chargebacks. No bad-faith disputes. No holding periods. Card passes, you get paid. Full stop.
Card Protection
No card ships directly between buyer and seller. A WWAN-tracked smart label is sent to the seller for redundant tracking — no more lost packages. The card is delivered to the ISOHub for biometric verification. Tamper detection is active from the moment it leaves the seller's hands — any interference triggers an automatic return.
100% Money Back Guarantee If verification fails
100% Disputes Resolved In-House No third-party arbitration
4 Verification Stages SAC → HAC → CPC → PRVC
The Architecture

Two Pillars.

01
Pillar One
Biometric Identity
Every card gets a unique fingerprint of its inherent substrate. Captured once, verifiable for life.
02
Pillar Two
Provenance Chain
Hub-only transactions. Verified owner to verified owner. Full chain of custody, logged forever.
How Verification Works
Live Biometric Capture
Stage HAC
12 × 12 Capture Grid 144 / 144
Hover any cell to inspect what's being captured
Card
2026 Topps Heritage
Cells Sampled
144 / 144
Fingerprint Hash
0x7f3a…b29c
Match Confidence
99.997%
01 · Pillar One — Biometric Identity

The Card IS The Identifier.

No score. No grade. No 1–10 ranking. GrailISO captures the inherent substrate of every card — paper fiber patterns, print-dot geometry, edge cuts — across a uniform 12×12 capture grid. The result is a biometric fingerprint that can identify your specific card for life, across any number of owners.

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Inherent Substrate, Not Condition
We capture what makes your card uniquely itself — not how nice it looks. A scratched card and a perfect card both verify cleanly.
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Pre-Encapsulation Only
Captured before any sleeve or holder. The fingerprint is the card itself, not the slab around it.
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Multi-View Stereo Capture
Patent-defensive architecture — structurally distinct from PSA, BGS, SGC, and TAG. We're not a grading service. We're an identity layer.
Early Access

The Hunt
Starts Here.

Join the waitlist or become an alpha tester — be among the first collectors on the platform when we launch.

You're on the list. Welcome to the hunt.