Yu-Gi-Oh prices by set code

The set code is the card

Players and sellers do not search by name, they search SDV7-050 or EX4-003, because the name is shared across a dozen printings at a dozen prices. Pass the code straight through as the query and the comp stays on that printing instead of collapsing every reprint into one meaningless average.

curl -G https://api.compsapi.com/v1/sold \
  -H "Authorization: Bearer YOUR_KEY" \
  --data-urlencode "q=charizard psa 10" \
  --data-urlencode "days=1095" \
  --data-urlencode "best_offer=1"

Rarity and parallels split the price

Secret, Ultimate, Ghost and Starlight printings of the same code are separate markets. Keep the rarity in the query and the card layer holds it, so a Secret Rare comp is not diluted by commons sharing the code. The same applies to first edition against unlimited, which is a filter rather than a hope.

Singles sell in bulk, and bulk poisons comps

A huge share of Yu-Gi-Oh listings are lots, playsets and bundles. Those are multi unit sales, and a per unit price read off a bundle is not a single card price. Sales with a known unit count are flagged, so a lot of 50 never sets the price of one card.

Three years, because reprints reset the market

A reprint can take a card down 80 percent overnight and it never comes back. Pricing off 90 days of history means pricing a card as if the reprint never happened, or missing that it did. days=1095 shows the step down and where the floor settled.

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