An employee of OpenSea

In June 2025, OpenSea, a popular NFT marketplace, had a serious data breach. An employee at Customer.io, the company that handles OpenSea’s emails, leaked

OpenSea among six organizations affected by email

An employee of OpenSea’s email delivery partner Customer.io leaked customer emails to a third-party. The NFT platform has warned users that there is now “a

7 Million OpenSea Addresses Leaked in 2025 Breach, SlowMist

OpenSea hit by data breach after email delivery partner leaks

OpenSea users' email addresses leaked in data breach

Third-Party Data Breach Exposes OpenSea API Tokens

OpenSea Data Breach Exposes 7 Million Email Addresses

OpenSea Users Face Phishing Risks as 7 Million Emails

OpenSea

OpenSea – which happens to be one of the largest NFT marketplaces in the world – initially alerted its customers to the breach on J, during which it identified

Third-party breach leaks OpenSea API key data - TechRadar

OpenSea, one of the world’s most popular marketplace for non-fungible tokens (NFTs), has been breached, with sensitive user data stolen. The company confirmed