Distributed Ledger Technology (DLT) and Secondary Market Liquidity Infrastructure: contribution to a sovereign European Tokenised Wholesale Financial System

Abstract

The European Central Bank’s Appia initiative (March 2026) and its short-term precursor, Pontes, mark a structural reorganisation of European wholesale financial market infrastructure. This paper analyses Appia’s design and the distributed ledger technology (DLT) ecosystem emerging under the EU DLT Pilot Regime (Regulation 2022/858), and identifies two financial-stability vulnerabilities: the absence of a compliant automated secondary-market liquidity layer for tokenised instruments, and the dependency of European DLT infrastructure on non-European platforms, settlement stablecoins, and pricing oracles. Drawing on primary regulatory sources and the operational Spanish DLT ecosystem, and framed through network-externality and critical-infrastructure theory, it develops four analytical propositions: (i) infrastructure fragmentation may constitute a systemic risk structurally analogous to pre-TARGET2 settlement fragmentation; (ii) the absence of a MiFID II-compliant automated market-making (AMM) layer creates a structural liquidity trap; (iii) three critical components — settlement stablecoins, reference-rate oracles, and AMM governance — are currently controlled by US-domiciled entities, creating a ring-fenceable sovereignty gap; and (iv) Spain’s vertically integrated national ecosystem offers a replicable model for European financial stability. The paper proposes a seventh Appia building block — secondary-market liquidity infrastructure — and specifies the design of a compliant yield-space AMM, with implications for the Pontes pilot (Q3 2026) and the H2 2028 Appia blueprint. The propositions are theoretical and falsifiable but not yet empirically tested, pending operational Pontes data.