DD in the Wild: Fystack’s Self-Hosted Custody Stack

The DD ecosystem is growing. We’re proud to highlight builders making digital assets safe, trustless, and ready for real use.

This week’s spotlight: Fystack, a team building bank-grade MPC custody infrastructure for digital assets. They’ve open-sourced Fystack Ignite – a one-line shell script that deploys a complete self-hosted setup on-premise or across major clouds (AWS, Azure, GCP) in a few minutes. With just a single command, developers can spin up a multi-chain MPC custody solution featuring Webacy DD as the default risk engine.

Fystack integrates Due Diligence (DD) Risk Check APIs to automatically verify whether a withdrawal address is legitimate and low-risk. This safeguards customers from transacting with sanctioned, high-risk, or blacklisted addresses that could later be flagged by centralized exchanges.

In addition, Fystack implements an Address Poisoning Detection feature that identifies spoofed or look-alike malicious addresses — a common Web3 attack vector that tricks users into sending funds to fraudulent destinations.

“The DD.xyz API is incredibly powerful and seamless. It covers everything we need for address risk assessment. Without it, we’d have spent months of development time building an equivalent system ourselves.”
—Founder of Fystack

Open-source solutions like this push the industry toward modular, transparent safety systems, ones that developers can audit, extend, and trust.

Fystack’s architecture makes it easy for financial institutions and startups alike to run compliant custody stacks with built-in risk management from day one. It’s a perfect example of how DD can empower devs to build smarter, safer products.

Stay tuned for more DD in the Wild:  real builders, real integrations, real safety.