The Card Grading API for Developers and Card Marketplaces
The CardMintAI card grading API is a REST endpoint that accepts a card image and returns an AI-generated PSA-style grade plus sub-grades for centering, corners, edges, and surface. Built for dealers, marketplaces, and third-party apps — no SDK lock-in, JSON in / JSON out.
REST
API
JSON
Response
~2 Sec
Per Call
Any
Language
Card Grading You Can Build On
Programmatic AI grading for marketplaces, dealer tools, mobile apps, and inventory systems
Simple REST Endpoint
POST card images to a single endpoint, receive structured JSON with overall grade, sub-grades, confidence, and estimated value. No SDK required — works from curl, Node, Python, PHP, anything.
PSA-Style Sub-Grades
Every API response includes individual scores for centering, corners, edges, and surface — the same four attributes PSA evaluates. Use them to power inventory filters, dealer pricing, or grade-prediction UIs.
Estimated Value Included
Each API response includes raw, PSA 9, and PSA 10 estimated value bands based on recent market sales. Perfect for auto-pricing marketplace listings or annotating dealer inventory.
Built for Marketplaces
Auto-grade new listings as users upload them. Display predicted grades on listing pages. Filter inventory by predicted grade. The API is built for high-throughput, low-latency marketplace use.
Dealer Inventory Integration
Pipe CardMintAI grading into your POS, eBay, Shopify, or in-house inventory system. Bulk endpoint for batch processing — grade an entire buylist in one call.
Mobile App Power-Up
Building a card collection app? Power your grading feature with CardMintAI's API. Hand off the AI/ML investment, focus on your UX.
Authentication via API Keys
Generate API keys in your dashboard. Rotate, scope by plan tier, and revoke any key without affecting others. Standard Bearer-token auth.
Generous Free Trial
Start with a free trial of API calls to validate integration. Paid tiers scale with volume — pricing transparent in the dashboard.
Use cases
Who Uses CardMintAI?
Discover how different professionals use CardMintAI
Collectors & Hobbyists
Assess Card Conditions Before Grading
Save time and money by identifying high-value cards to prioritize for grading. Get instant AI grading to determine the potential grade of your cards before submitting them to official grading services.
Resellers & Dealers
Generate Grading Reports for Sales
Boost sales by showcasing AI-backed grading reports alongside your card listings. Provide potential buyers with detailed grading reports, increasing the credibility of your listings.
Marketplace Sellers
Integrate Grading for Product Listings
Increase buyer confidence with consistent, AI-generated grading reports. Integrate AI grading directly into your marketplace listings, allowing buyers to view card conditions instantly.
Grading Pre-Checkers
Evaluate Card Quality Before Submitting
Avoid unnecessary grading fees by assessing card condition early. Use AI to pre-check cards and get a sense of their grading potential before submitting to PSA/BGS.
Investment Groups
Track Grading History and Resale Value
Leverage historical data to identify undervalued cards with high grading potential. Monitor card grading history and predicted resale value to make informed investment decisions.
Developers & Integrators
Build Custom Grading Workflows with the API
Automate grading at scale and embed grading reports in your own platform. Use the CardMintAI API to integrate AI-powered card grading directly into your marketplace, app, or internal tools.
Popular Grading Tools
Flexible Plans for Collectors and Resellers
Start free and upgrade as your collection grows. CardMintAI offers scalable plans for hobbyists and high-volume sellers.
Collector
- 60 gradings/month
- Batch grading (up to 10)
- API access
- Analytics dashboard
- Priority support
Master
- 150 gradings/month
- Everything in Collector
- Batch grading (up to 10)
- Dedicated support
- Custom integrations
We also offer extra credits packages that never expire and can be used at any time. 1 credit = 1 grading.
Explore Credit Packages →Frequently Asked Questions
How accurate is the card grading API?
The API uses the same model as our consumer product — 95% alignment with actual PSA outcomes, with most predictions within ±1 grade point. Each response includes a confidence interval so you can filter low-confidence predictions out of automated workflows.
What's the latency of one grading call?
Approximately 2 seconds per card under normal load. P99 latency stays under 4 seconds. Bulk endpoint processes hundreds of cards in parallel — a 100-card batch typically returns in 30–60 seconds.
What categories does the card grading API support?
Pokémon (English + Japanese), Magic: The Gathering, Yu-Gi-Oh, baseball, basketball, football, hockey, soccer, and other major sports + TCGs. Pass an optional category parameter for slightly higher accuracy on specialized cards, or omit and let the AI auto-detect.
Is there a free tier or trial for the API?
Yes. New developers get a trial allocation of API calls to validate integration before paying. Production tiers scale with monthly volume — pricing tiers visible in the dashboard.
Can I use the API to power my own card grading app?
Yes — that's a primary use case. Build the UX you want; let CardMintAI handle the AI/ML. Just attribute (where required by license) and respect rate limits.
How is the card grading API priced?
Per-call with volume tiers. Lower per-call cost as monthly volume increases. Custom enterprise pricing available for marketplaces and integrations above a certain threshold.
Build with the Card Grading API
Get your API key, hit the endpoint, ship faster. Free trial, transparent pricing, scales with you.