Frequently asked questions

A price guide, buy/sell-signal engine, and portfolio tracker for trading cards, built on real sales data only. Browse current values for free; membership adds the market signals, trade targets, buy advisor, AI scanner, pre-grade estimates, portfolio tools, and the market assistant. The full tour lives on the "What is it?" page.

Trading card games — Pokémon, Magic: The Gathering, Yu-Gi-Oh, Disney Lorcana, and Digimon — plus sports cards across baseball, basketball, football, hockey, and soccer. New sports sales flow in daily, and the sports catalog grows from that real market activity.

Real market activity only. TCG prices are TCGplayer market prices (a sales-derived figure, refreshed daily). Sports card prices come from recorded sold sales on eBay and the major auction houses — actual completed transactions, never asking prices or active listings. If a card hasn't traded, we show that honestly instead of inventing a number.

Daily. Prices, trends, indexes, signals, and trending lists all recompute every night on the newest sales.

Sixteen tiers across PSA, BGS, CGC, SGC, and raw. Raw TCG cards also get a condition ladder — Near Mint is the live market price, and Lightly Played, Moderately Played, Heavily Played, and Damaged are derived with the standard market discounts, labeled as estimates.

Every night the engine scores every liquid card and grade from 0–100 across eight market factors — things like trading below its 90-day average, recovering from a pullback, or rising on fading volume — and publishes plain-language BUY calls at scores of 40+ and SELL calls at 55+, the thresholds where the backtest proved a real edge, with the reasons spelled out.

Before launch we replayed the engine against 29 months of real sales, week by week, using only the data that existed at each point in time — no hindsight. Buy signals went on to beat the market by +5.3 points over the following 4 weeks (+7.7 by 12 weeks) and won in 99 of 100 backtested weeks; sell flags trailed the market by −5.4 points (−10.9 by 12 weeks). Roughly 25,000 signal-weeks were stress-tested, with outcomes measured on actual post-signal sales. That's measured past performance on our data feed — not a promise of future results.

Because we haven't proven them there yet. Our sports sale history is younger than the TCG side, and our policy is simple: no signal publishes for a market until the same point-in-time backtest proves an edge in it. Sports signals turn on the moment the data clears that bar — that's the "DataNeverLies" promise working as intended.

No. Signals, prices, and estimates are informational tools. Backtested performance is a measurement of the past, not a guarantee about the future. Collect and trade at your own judgment.

Ready-made price ladders for any card and grade: sell targets at 95 / 90 / 85 / 80% of market value and buy targets from 80 down to 60%, computed separately for eBay (where the ~13% seller fee is netted out of your sell targets) and for cash deals at a show. Illiquid cards automatically get wider discounts so the targets stay realistic.

You enter an asking price and where you're buying (eBay or in person), and it renders a verdict — steal, buy, fair, rich, or pass — using the card's market value, the venue's fair-price band, the card's liquidity, and any active signal on it. Like everything here it's informational guidance, not financial advice: the call, and its outcome, is always yours.

That row has no recent sales of its own, so its price is interpolated from the card's sale-backed grades along the grading curve. Estimates are always labeled, are excluded from signals and market indexes, and never masquerade as real sales.

Photograph a card and the AI identifies it — set, number, parallel — and pulls up its live prices. If it's a slab, it reads the label and cert number, ready for you to check against the grader's own cert lookup before money changes hands.

No — it's an estimate to inform your grading decision, not a grade. The tool examines your photos, measures centering, and returns a likely grade range with subgrade-style detail so you can skip submissions that wouldn't pay off. Only PSA, BGS, CGC, or SGC can assign an actual grade.

A clear, well-lit front photo; adding the back improves the estimate since edges, corners, and surface wear on the back move real grades. Blurry photos get a 'retake' response instead of a fake confident answer.

Add your cards with grade, quantity, and what you paid. The portfolio then marks everything to live market prices: total value, gain/loss per card and overall, and a performance chart over time.

Watch any card and set a threshold in either direction. Alerts appear in the app and land in your email digest, so you don't need to keep checking the page.

The full price guide — every card, grade, price history chart, and recent sales — is free to browse. Membership unlocks the tools: buy/sell signals, trade targets, the buy advisor, AI scanner, pre-grade, portfolio, watchlist and alerts, and the market assistant.

$14.99/month, $34.99 per 3 months, or $99.99/year (≈ $8.33/month — the best value). Every plan starts with the same 7-day free trial.

You get full membership access for 7 days. A card is required to start, but you're charged $0 today — your plan begins automatically when the trial ends, and canceling before then means you pay nothing at all.

Settings → Billing, one click into the secure Stripe portal. Cancellation takes effect at the end of your current period and you keep access until then. No emails, no phone calls, no retention hoops.

The trial exists so you can fully evaluate the product before paying — cancel before it ends and you're never charged. Charges already made are non-refundable except where required by law, as covered in the Terms of Service.

Yes — plan changes are handled in the same Stripe billing portal under Settings → Billing.

DataNeverLies runs in any mobile browser — nothing to download, and the scanner works straight from your phone's camera. Add it to your home screen and it behaves like an app.

AI scans (card identification and pre-grade combined) are capped at 50 per day and the market assistant at 200 messages per day — generous ceilings meant to stop abuse, not real use. Browsing, portfolio, watchlist, and alerts have no usage caps.

All prices are in US dollars, reflecting the US market the sales data comes from.

No. Only completed sales and sales-derived market prices feed the guide. Asking prices tell you what sellers wish for; sales tell you what buyers actually paid. We only use the second kind.

Sales are matched with guards for set, year, parallel, serial numbering, autographs, and multi-card lots, and the matching is audited against the raw listing titles. When an audit finds a bad match, the sale is removed and the matcher is hardened so it can't recur.

It says so. A card that last sold ten months ago shows 'last sold' with the date rather than a fresh-looking count; thinly-traded cards carry wider trade-target discounts; and price rows without real sales are labeled estimates and excluded from signals and indexes.