Quick answer: Atomic settlement means both legs of a trade complete at the same instant, or neither does, which removes the risk that one party pays and the other does not deliver. AtomicNet is a settlement and messaging protocol from PolySign, a firm led by Ripple co-founders, designed to let institutions settle trades directly without prefunding while limiting credit risk. It is documented in a public whitepaper, and the messaging layer is compared to FIX, the standard used across traditional finance.
Updated 07/17/2026. By Jake Claver. Educational content, not investment advice.
Most settlement failures come down to timing. In traditional markets, a trade is agreed at one moment and settled later, and in the gap one side can default, prefunding gets tied up, and trades break. Atomic settlement attacks that gap directly: make the exchange all-or-nothing. AtomicNet is one attempt to build that as shared infrastructure for institutions.
What atomic settlement means
Atomic settlement is the property that a trade either completes in full on both sides simultaneously or does not happen at all. There is no window where one party has delivered and the other has not. That matters because the alternative, delayed settlement, is exactly where counterparty and settlement risk live, the kind of risk the plumbing behind central securities depositories like the DTCC is built to manage. Shrinking or removing the settlement window changes the risk math.
What AtomicNet is
AtomicNet is described in its public whitepaper (authored by Kimon Papahadjopoulos and Arthur Britto, copyright 2023 PolySign Inc.) as three things together: a messaging protocol, a network of institutional participants that implement it, and a rulebook specifying the terms of transactions. The stated goal, in the whitepaper’s own words:
The AtomicNet vision is to enable a world of liquidity where every asset, including traditionally illiquid assets (e.g., Real Estate, Private Equity), can be instantly and securely traded for any other asset. To achieve this vision, the AtomicNet protocol enables participants to directly settle trades without prefunding while minimizing credit risk.
Two design choices stand out. First, settling without prefunding means participants do not have to park capital in advance to guarantee a trade, which frees up liquidity. Second, the protocol is meant to reduce trade breakage and settlement costs. PolySign has built software implementations, including a program it calls atomicnetd that exposes an API so institutions can wire settlement into their existing processes rather than rebuild them.
Who is behind it, and the FIX comparison
PolySign is an institutional digital-asset infrastructure company. Its own site describes it as building secure, scalable infrastructure for financial institutions, with custody at the core. Its president, Arthur Britto, co-founded Ripple and helped design the XRP Ledger (the ledger’s technical documentation lives at xrpl.org), and David Schwartz, another XRP Ledger designer, has been involved on the technology side.
The messaging angle is the part that connects this to how institutions already work. In 2022 coverage of the effort (then discussed under the name PolyNet), PolySign leadership compared the messaging layer to FIX, the standard messaging protocol used across asset classes in traditional finance, and said the company was working with large asset managers and service providers. The point of that comparison is adoption: institutions understand a FIX-like message flow, so a settlement network that speaks a familiar language is easier to plug in.
Where stablecoins and tokenized money fit
Atomic settlement of any asset for any asset still needs a cash leg, and that is where tokenized money enters. A stablecoin or tokenized deposit can be the settlement asset on one side of an atomic swap. This is the same territory official researchers have mapped. The Bank for International Settlements, in its work on a unified ledger, argues that tokenized settlement works best when it rests on central bank money, and it distinguishes tokenized deposits from stablecoins as bearer instruments. The U.S. Treasury’s President’s Working Group stablecoin report similarly examined payment stablecoins and flagged reserve and redemption risks. A settlement protocol does not resolve those questions; it depends on whatever cash instrument the participants choose.
Why this matters
Settlement infrastructure is unglamorous and consequential. If atomic, prefunding-free settlement works at institutional scale, it changes how much capital sits idle as collateral and how much counterparty risk a trade carries. That is the practical claim behind AtomicNet. It is worth keeping expectations grounded: this is a protocol with a published design and named backers, not a proven, widely-adopted market utility yet, and the whitepaper describes a vision as much as a finished system. As always, the infrastructure question is separate from any investment view on Ripple, XRP, or any token that might touch these rails.
Common questions
What is atomic settlement?
Atomic settlement means both sides of a trade complete at the same instant or neither does. There is no window where one party has paid and the other has not yet delivered, which removes the counterparty and settlement risk that lives in delayed settlement.
What is AtomicNet?
AtomicNet is a settlement protocol from PolySign, described in a public whitepaper as a messaging protocol, a network of institutional participants, and a rulebook. It is designed to let participants settle trades directly without prefunding while minimizing credit risk, and to reduce trade breakage and settlement costs.
Who is behind AtomicNet and PolySign?
PolySign is an institutional digital-asset infrastructure company focused on custody and settlement. Its president, Arthur Britto, co-founded Ripple and helped design the XRP Ledger, and fellow XRP Ledger designer David Schwartz has been involved on the technology side. The AtomicNet whitepaper is copyright PolySign Inc.
How does AtomicNet relate to FIX messaging?
PolySign has compared AtomicNet’s messaging layer to FIX, the standard messaging protocol used across asset classes in traditional finance. The comparison signals that the protocol is meant to fit into workflows institutions already understand, making integration easier.
Do stablecoins play a role in atomic settlement?
They can serve as the cash leg of an atomic trade. A stablecoin or tokenized deposit can be the settlement asset on one side. The reserve backing and risk of any such token still depend on its issuer, as both the U.S. Treasury stablecoin report and the BIS have noted.
This content is educational only. It is not tax, legal, or investment advice. Check primary sources and speak with a qualified professional before making financial decisions.
