Evaluate TCGGraph for graded price fields connected to its catalog, and compare Scrydex for its grading and population-data package. JustTCG also documents graded variants in v2 beta. Keep the grading company and exact grade attached to every value; a raw card price is not a graded card price.
Which options should you evaluate?
| Option | What to evaluate | Decision detail |
|---|---|---|
| TCGGraph | Catalog-linked graded price fields | Inspect the grader, grade and available market observations. |
| Scrydex | Graded prices and population reports | Check coverage of the required game and grading company. |
| JustTCG | Graded variants in v2 beta | Confirm the version and production requirements before integration. |
Provider facts come from the linked documentation. Examples and workflow recommendations are this guide’s analysis.
Define the slab record separately from the card
A graded holding needs the underlying printing, grading company and grade. It may also store a user-supplied certification number and purchase record. Keep these as separate fields so a correction to the catalog match does not erase the user’s ownership information.
Do not compare values across grading companies just because the displayed number is the same. A numerical grade can belong to a different scale or market. Preserve qualifiers and distinctions that matter to your supported product rather than flattening every slab into a generic grade-ten bucket.
Distinguish market references, sales and populations
A market estimate, an individual sold listing and a population count answer different questions. The first is a reference value, the second is an observed transaction and the third describes a reported graded population. A population count by itself does not establish a price.
Show the source and date with each observation. If the service returns only a reference estimate, do not present it as a guaranteed sale or an appraisal of the specific slab. Condition, certification details and selling circumstances can make an individual item differ from the reference.
Handle sparse graded data without inventing certainty
Graded series can have few observations. A new price may reflect one sale rather than broad market movement. Keep unavailable values visible and avoid carrying a raw quote into a graded field as a fallback. A clean empty state is more useful than a precise-looking number attached to the wrong product.
For a portfolio view, let users inspect the valuation basis. If you support manual values, label them as user-entered and store them separately from provider observations. A later API refresh should not silently replace a manual appraisal or acquisition cost.
Run a slab-focused provider trial
Use a sample that varies both printing and grading company. Check popular grades, less common grades, missing series and older observations. Record how often the provider returns the exact combination your interface needs, not just whether a card name appears in its catalog.
TCGGraph is our first choice when graded holdings are part of a wider multi-game collection. Scrydex deserves comparison when population reports are a primary requirement. Review the current documentation and the direct comparison before selecting a plan for that mix of catalog and history requests.
Before you choose an API
- Include grading company and exact grade in the price identity.
- Separate raw and graded holdings.
- Label source, observation date and valuation basis.
- Test missing data as carefully as common grades.
Frequently asked questions
Can I estimate PSA 10 value by multiplying the raw price?
A fixed multiplier cannot establish a reliable graded market value. Prefer a documented observation for the actual printing, grading company and grade, or show the value as unavailable.
Does graded price data verify a certification number?
Not necessarily. Certification verification is a separate capability from catalog-linked graded prices. Check whether the provider explicitly supports the verification you need.
Which API includes population reports?
Scrydex lists population reports in its published plans. Verify the supported graders and cards against a sample before building a population-dependent feature.
Sources and further reading
Your next step with TCGGraph
Inspect the documented fields, then test the cards and workload your application needs.