Open Source in Finance Forum London 2025

FDC3 has revolutionized interoperability in financial services, but until now, its full potential has been limited to desktop containers. FDC3 2.2 changes that by bringing FDC3 to the web for seamless app-to-app communication across any platform for a true “write once, run anywhere” experience—no extensions, no workarounds, just frictionless interoperability.

In this session, we'll explore why this shift matters, what’s new in FDC3 2.2, and how firms can adopt it to streamline workflows and reduce IT complexity. Attendees will get a firsthand look at FDC3 for the Web in action, including real-world use cases and a live demo, along with insights into what’s next for the standard.

In today’s fast-paced financial and enterprise environments, users expect a seamless experience as they move between applications. But without a standardized way to share user identity, workflows become fragmented, productivity suffers, and security risks increase.

Enter FDC3, the open standard for inter-application communication. In this session, we’ll explore how FDC3 2.3 will allow sharing user identity across applications securely and efficiently—eliminating redundant logins, reducing manual data entry, and enabling a more connected ecosystem.

There is a strong desire in the FDC3 community to support multiple app scopes within a parent app scope. FDC3's origins lie in desktop containers, and for web apps this meant hosting apps via urls in separate windows. This means micro-frontend containers in vanilla web browsers need to host apps in separate windows or iframes in order to use FDC3. This is appropriate when hosting apps from multiple vendors (e.g. for code isolation purposes) but is an undesirable restriction for apps from a single vendor. In particular, many organizations have existing platforms hosting separate web apps as modules within the same window (same DOM) by means of module federation or import maps. Retrofitting FDC3 support to such a platform is currently problematic. Beyond web apps, there are also similar challenges with composition in the case of native apps. The FDC3 Standard Working Group has been working on a solution, which involves the new concept of 'sub-agents'. This talk provides an overview of the motivation, the opportunity, the challenges, and the proposed changes to the FDC3 Standard to enable 'sub-agents' and multiple app scopes - for both browsers and other containers.

This presentation explores the integration of AI agents with FDC3 standards through voice interaction, featuring a live demonstration using FINOS SAIL. We'll examine how this approach addresses two UX challenges for financial professionals: the manual selection required in current FDC3 intent resolution and the attention-splitting nature of chat interfaces in trading environments.
The session will cover:

UX limitations in existing FDC3 implementations and how AI agents can enhance workflow orchestration
Comparing visual attention requirements between chat and voice interfaces in multi-screen trading environments
Technical implementation using FINOS SAIL and potential extensions to other FDC3-compliant containers
Deployment options comparing cloud, on-premises, and local implementations with focus on open-source solutions
Live demonstration of voice commands executing complex workflows across multiple financial applications

Attendees will gain practical insights on enhancing FDC3 with AI assistants, implementation approaches using open-source technologies, and design principles for attention-preserving interfaces in financial applications.

The Challenge: LSEG faced growing client demand for more flexibility in how its Workspace apps could be consumed. A proprietary messaging framework limited LSEG’s ability to offer an integrated experience outside of its own closed platform.

The Implementation:
-What drove the top-down product and business leadership strategy to support FDC3.
-How a large-scale, central technology standard for FDC3 was set up for success and implemented.
-Which new requirements emerged including content enrichment and symbology translation, iframe support and multi-machine interoperability without tech-stack dependencies.
-How collaboration with partners and clients accelerated the journey and opened up an ecosystem

The Solution: LSEG migrated their Workspace apps to FDC3 from their internal messaging framework, opening up scalability. The Workspace apps became portable and ready for integration for internal and external clients while LSEG gained operational efficiencies. Leveraging Open Source, LSEG and Here are expanding the ecosystem of vendors using FDC3.

Next Steps:
Overcoming additional hurdles...
-Broadening community adoption
-Improving Translation with OS
-Educating a diverse audience

A report from the front lines of implementing tokenization, smart contracts, and digital currencies to improve efficiency and liquidity, open new markets, reduce risk and more.

Technology leaders from regulatory, banking, and fintech organizations will sit down with Daniela Barbosa of LF Decentralized Trust for a discussion of their work implementing decentralized technologies. Attendees will hear first hand about what is driving adoption of these technologies by financial services institutions worldwide as well as the challenges and successes that have come with bringing them to market. The conversation will also delve into the roles open development, open governance and standards play in driving innovation and ensuring stability and trust.