An employee of OpenSea

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

OpenSea users' email addresses leaked in data breach

Third-Party Data Breach Exposes OpenSea API Tokens

OpenSea among six organizations affected by email

7 Million OpenSea Addresses Leaked in 2025 Breach, SlowMist

Third-party breach leaks OpenSea API key data - TechRadar

OpenSea

OpenSea Users Face Phishing Risks as 7 Million Emails

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

OpenSea

OpenSea Data Breach Exposes 7 Million Email Addresses

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

OpenSea hit by data breach after email delivery partner leaks