Research
Original, data-driven studies of the crypto-card market, built on the Sweepbase dataset of 171 tracked cards, 139 of them live.
Which balance actually earns
Most cards advertising yield pay it on money the card cannot spend. A field-by-field count of where the interest actually accrues across the 139 obtainable cards, what each of the ones that qualify makes you switch on first, and the issuers who claim a yield without ever saying which balance earns it.
Published August 2026
Seven card apps, one order book
Nine of 139 obtainable cards put a leveraged trading desk in the card app, and seven of them execute on the same venue. Which card shares one wallet between spending and collateral, which keep them apart, and the card cut from the list when its two country lists turned out not to overlap.
Published August 2026
What the card said, and what the statement said
Five published numbers checked against our own money on the cards we hold. Three paid what they promised, one fell short, and one turned out to be a cost that appears on no fee schedule anywhere.
Published July 2026
When crypto cards die together
A primary-sourced record of crypto-card shutdowns, grouped by the upstream failure that caused them. One licence revocation or sponsor-bank exit can freeze several consumer cards on the same day.
Published June 2026 · updated July 2026
The hidden banks behind crypto cards
A BIN-sponsor concentration analysis across 171 tracked crypto-linked cards: who really issues them, and what happens to a cardholder when the sponsor bank behind a card fails.
Published May 2026 · updated June 2026