Hack history / Monthly reports / 2021-04
Crypto hacks and thefts, April 2021
Thefts are hacks, exploits, phishing, scams and rug pulls, in dollars at the time. A single source for $500M or more waits for a second source before it counts.
Taken
$2.61B
8 thefts
vs the month before
22×
22× ($120.8M)
vs a year earlier
102×
102× ($25.6M)
Largest thefts
How attackers got in
Insiders: rug pulls, frauds, collapses 1$2.50B
Phishing and scams 1$59M
Smart contract bug 4$55.2M
Keys, accounts and infrastructure 1$0
Other 1$0
By chain
Bitcoin 1$2.50B
Polygon 1$59M
BNB Chain 2$51.8M
Polkadot 1$3M
Ethereum 1$367K
not stated 2$0
By target
Centralized exchange 3$2.50B
DeFi protocol 5$114.2M
Collapses and frauds, counted apart
2 cases, $3.60B.
Cite this page
SwanBluechip, "Crypto hacks and thefts, April 2021", Crypto hack history, https://swan-hack-tracker.pages.dev/history/m/2021-04/ (data as of 2026-10-31).