Open-Source Payment SDK
A modular SDK for stablecoin transactions, wallets, and reconciliations — audited and vendor-neutral.
Open, predictable money
Empowering the world through open, stable, and borderless payments.
We build and support open-source technologies that enable stablecoin-based payment systems—free for all and governed by transparency. Our work focuses on stability, inclusivity, and robust developer tooling to help communities and businesses onboard the digital economy.
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Foundation
Dutch-registered non-charitable foundation
Reg. NL
We create developer-first SDKs, reference implementations, and governance tooling that
prioritize stability, auditability, and wide compatibility.
What we are
Free Stable Software Foundation is a Netherlands-registered foundation dedicated to developing free and open-source tools for stablecoin-based payment systems. We are non-profit-minded in purpose, platform-agnostic in engineering, and governed with public clarity.
Why stablecoins matter
Stablecoins bridge fiat systems and decentralized rails: they provide predictable value, fast settlement, and programmable money. When built transparently, they unlock financial inclusion for businesses and communities worldwide.
Open-source
Code, audits, and governance are public.
Transparency
Clear reporting and audit trails.
Our Work & Initiatives
Developer Grants Program
Funding and mentorship for contributors building core tooling and integrations.
Educational Resources
Guides, documentation, and courses to make stablecoin infrastructure accessible.
Community Governance
Transparent decision making, proposal tracking, and public minutes for all core decisions.
Why stablecoins?
Stablecoins combine the programmability of digital assets with price stability. They can settle instantly, reduce friction, and enable predictable cross-border value transfer — when paired with open governance, they democratize payments.
Predictability
Stable value reduces settlement risk and enables
planning.
Inclusion
Accessible rails for underbanked communities and small
businesses.
Transparency
Public audits and open tooling build trust and
interoperability.
Total Volume (demo)
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Third-party reports
Become a Contributor
Join our developer community — contribute code, documentation, or audits. We welcome diverse backgrounds and provide mentorship through our grants program.
- Open-source first
- Code reviews and bounties
- Community-first governance
Partner With Us
We partner with companies and non-governmental organizations on integrations, standards, and pilots that prioritize inclusion and auditability.
- Technical integrations
- Joint pilots & research
- Policy & compliance collaborations
Join our mailing list
Get updates about grants, releases, and events.
Voices from the community
"The SDK cut our integration time by weeks. Clear docs, sound engineering, and responsive maintainers — invaluable for payments at scale."
"Transparent governance and available audits gave our compliance team the confidence to pilot stablecoin settlements."
"Grants allowed contributors from underrepresented regions to build tools tailored to local needs — that impact is the mission."
Support open, stable payments
All contributions fund open-source development, audits, and global community programs. We pledge transparent reports on fund allocation.
- Audited spending reports
- Open funding proposals
- Direct support for contributors
News & Updates
Oct 1, 2025
SDK v2.0 Released
Major improvements: multi-currency reconciliation, new adapters for popular custodians, and faster settlement flows.
Read more →Sep 10, 2025
Grants: Round 5 Winners
Announcing eight projects focused on local currency integrations and offline settlement.
Read more →Aug 4, 2025
Transparency Report Published
Quarterly financial and operational report with independent audit annexes.
Read more →Contact
Questions? Partnership inquiries? Finance and legal contacts.
📍 Registered in the Netherlands