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An expansion is a set released together: Base Set, 151, Evolving Skies. It belongs to exactly one series, and every card belongs to exactly one expansion. Ids are short and stable: base1, sv03.5, swsh7.

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Counting cards

Two counts, and they disagree on purpose:
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number | null
The printed set size, the number on the bottom of the card. Excludes secret rares.
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number | null
Everything the expansion actually contains, secret rares included.
A card numbered 199/165 is not a mistake: 165 is official, 199 is inside total. 151, the set below, contains exactly that card. sv03.5-199, a Special illustration rare Charizard ex, sits inside a 207-card total against a 165-card official count.

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Legality

legal_standard and legal_expanded say whether the expansion is tournament-legal in each format. null means unknown, not banned: no legality data is available for that expansion.

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Palette

palette is up to four dominant colours from the expansion’s own logo, most prominent first, as #rrggbb. Build a gradient or an accent from the set’s real artwork instead of picking one by hand for every set you ship. They are the colours the logo contains, in the proportion it contains them. Base Set returns ["#fac32c", "#2a2e54", "#6d2239", "#3c5da4"]: its gold, its navy, the maroon of the Charizard, the blue behind it. A logo built on a heavy black outline leads with a near-black, because that genuinely is its most prominent colour. If you want an accent rather than a backdrop, pick the most saturated entry rather than the first. Fewer than four is a real answer, not a truncated one. A two-tone logo has two, and the list is never padded with colours the image does not contain. null means there is nothing to give: no logo is available, or its pixels are all transparent. Render your own fallback. Series carry the same field, taken from the series logo, so a screen showing a series and its expansions can theme both.

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Example