Community-driven
open-core infrastructure
Fystack is a community-driven, open-core infrastructure company building secure custody and wallet systems for fintechs and digital asset businesses.
We help teams operate digital assets with full control over keys, infrastructure, and risk, without relying on opaque SaaS platforms or black-box security models.
Our Philosophy
We believe custody infrastructure must meet three non-negotiable principles:
Control
Operators must retain ownership of keys, infrastructure, and decision-making.
Transparency
Security-critical systems should be inspectable and auditable, not trusted blindly.
Operational Reality
Infrastructure must be designed around real production workflows, not theoretical architectures.
These principles guide every technical and product decision we make.
Community-Driven by Design
Fystack is built alongside the teams who run it. Product decisions are shaped through direct feedback, production usage, and real operational constraints.
Many core features exist because a community partner needed them in production. We optimize for what works in practice, not what looks good in diagrams.
Our community includes:
Fintechs and payment providers operating regulated flows
Exchanges and custodians managing real liquidity and risk
Developers integrating MPC, wallets, and multi-chain automation
Security and compliance teams responsible for audits and controls
Open Source at the Core
Open source is a foundational part of how Fystack is built. Key components of our stack are developed openly to ensure:
In custody systems, transparency is not optional. It is a security requirement.
# Clone the repository
git clone https://github.com/fystack/mpcium
# Explore the codebase
cd mpcium
# Security-critical logic is open
# for audit and verificationOpen-Core, Enterprise-Ready
Fystack follows an open-core model. Core building blocks and protocols are open source, while enterprise deployments layer on:
Hardened deployment and operational tooling
Governance, policy enforcement, and approval workflows
Compliance, audit logging, and reporting features
Enterprise support, SLAs, and long-term maintenance
This model allows teams to benefit from open systems without compromising on reliability, compliance, or security.
What We Build
Fystack provides modular, self-hosted infrastructure for digital asset custody and payments, including:
MPC hot wallets and air-gapped cold wallets
Policy-driven transaction approval and automation
Multi-chain wallet orchestration and fund management
Audit-ready logging, monitoring, and security primitives
Our systems integrate cleanly into existing fintech stacks and are designed to scale from pilots to production-grade deployments.
Built for Regulated Environments
Fystack is designed with regulated operators in mind. Our architecture supports:
We build infrastructure that compliance, security, and engineering teams can all stand behind.
Access Controls
Clear separation of duties
Audit Trails
Verifiable transparency
Data Residency
Flexible deployment models
Compliance
Risk & monitoring integration
Our Mission
To make secure, transparent, and operator-owned custody infrastructure the default, not the exception.
Built with the community, for the community. We actively collaborate with our users through open technical discussions, early access to new features, and continuous feedback loops.