Blowfish

Blowfish is a B2B security and trust & safety platform for Web3 wallets. Its core business involves transaction simulation, human-readable transaction previews, dApp domain risk detection, and aggregation of risk signals from multiple sources to intercept phishing and malicious transactions before users sign. Its API can be embedded in wallet products to help users understand complex transaction data and avoid scams.

The market pain point: crypto users lose substantial funds to phishing and malicious signatures; wallet teams building security infrastructure in-house is costly and time-consuming; existing solutions lack readable parsing of transaction content. Blowfish's differentiation lies in integrating multi-source risk signals into unified decisions, plus a local blocklist and open-source UI components.

Important changes within two years: After being acquired by Phantom wallet, the standalone API service was gradually sunset for existing customers, forcing some integrators to migrate. Community feedback highlights issues including a high false-positive rate, opaque appeal processes, and centralization risks from relying on a single provider. Its open-source blocklist library remains maintained, but the overall product focus has shifted toward the Phantom ecosystem.