The Quant ecosystem: every product, what it does and who it is for

The product map

Quant's product line has grown in layers, and the easiest way to make sense of it is the three-part framing Quant itself uses: Overledger connects, QuantNet establishes trust, Fusion controls. Overledger is the original API gateway and everything built on it, including the Platform, Authorise and Tokenise. QuantNet is the settlement network announced in 2025. Fusion is the rollup where transactions can execute. Quant Flow sits on top of all of this as the bank-facing programmable-money product.

If you are new to the project, start with the explainer and then read this page top to bottom. If you already know what Overledger is, jump to the section on Fusion, because that is where the token economics changed most recently.

Overledger Platform

Overledger Platform is the software-as-a-service version of the gateway, launched on 27 June 2023. Before it, developers consumed Overledger through the API and SDKs; the Platform added a console with low-code "flows" that let a team issue a token, bridge an asset or deploy a smart contract across several connected ledgers without writing the plumbing by hand. Quant announced it as the same infrastructure used in Project Rosalind, the BIS and Bank of England CBDC API experiment that had reported eleven days earlier.

Under the hood it is still the gateway described on the Overledger page: one authenticated API that prepares a transaction in the target ledger's format, passes it for signing, submits it and tracks the outcome. The self-serve connectors cover the EVM family, Solana, Cosmos, SUI, Hedera and Aptos; XRPL, Stellar, Bitcoin and permissioned networks such as Hyperledger Fabric, Besu and Corda are enabled through a project engagement. Multi-factor authentication has been mandatory since release 2.2.25.

Overledger Authorise

Authorise answers the question every bank asks first: who holds the keys? Launched on 10 October 2023 and described by Quant as central-bank-grade key management, it provides transaction signing and key custody using AWS Key Management Service hardware security modules certified to FIPS 140-2 Level 2, with Fireblocks multi-party computation as an alternative. The point is that a blockchain transaction can be signed under the same policies, approvals and audit trails a bank already applies to a payment instruction.

For a developer, Authorise is the component that turns a prepared transaction from the gateway into a signed one. For a compliance officer, it is the reason Overledger can be deployed inside a regulated institution without the bank's private keys ever living in a browser extension. It is not a retail product and it has nothing to do with how you store your own QNT; for that, see the wallet guide.

Tokenise and multi-ledger tokens

Tokenise is Overledger's issuance module. The beta arrived in release 2.2.9 in April 2023 with QRC-20 tokens deployable to Ethereum, Polygon and XDC mainnets; a Tokenise feature was already cited in release 2.2.12 in August 2022, and the exact general-availability date is not confirmed. QRC is Quant's name for its chain-agnostic smart contracts. There are three token types: Base and Flex, both fungible, and Vari, for non-fungible tokens. All are ERC-based under the hood, which is what makes them portable across EVM networks.

The intellectual property around this is now patented in at least one jurisdiction: on 3 February 2026 Quant announced a Japanese patent for what it calls multi-DLT token innovation. In the Fusion era the same idea reappears as "unified tokens", described below, so Tokenise is best read as the groundwork for the rollup's asset model rather than a product on its own.

Quant Flow

Quant Flow was announced on 22 May 2025 as a programmable-money platform for banks. The fact sheet describes a white-label, API-driven product built on Overledger that lets a bank or corporate create payment products with conditions attached: release funds when a document is signed, split a payment across parties, or hold money in escrow until a delivery is confirmed. The logic is written in PayScript, a domain-specific language whose specification Quant has published on GitHub, which is unusual for an enterprise vendor and useful for anyone trying to understand what the product can express.

Quant says Flow draws on its work with the Bank of England, the UK Regulated Liability Network and the ECB; that is the company's own framing. The clearest external validation came on 25 March 2026, when Murex announced that Overledger and Quant Flow were embedded in its MX.3 platform for tokenised deposits and digital bond settlement. Flow is targeted at banks in Europe, the Middle East and Asia-Pacific. One caveat: Quant's standalone Flow product page returned an error on 2 November 2026, which suggests the product has been folded into broader "programmable money" pages rather than withdrawn. The remortgage completions in the UK tokenised deposit pilot, where funds were locked and auto-released, are exactly the kind of conditional payment Flow is designed for; the CBDC page tells that story.

Fusion, the Layer 2.5

Fusion is the most consequential addition to the ecosystem since the original gateway, because it is the first Quant product that executes transactions rather than routing them. Announced around 26 May 2025 as Overledger Fusion with a phased rollout starting from the Trusted Node Program, it reached mainnet on 2 June 2026, when Quant called it the world's first multi-ledger rollup and cited 74 connected networks. The number comes from Quant and the trade press that reported the launch; no public list exists.

How it is built

Technically Fusion is an optimistic rollup extended from the OP Stack. Quant maintains a public fork of op-geth, the Ethereum execution client used by Optimism-style rollups, and that repository was still being updated in October 2026. Execution data lives on a permissioned Hyperledger Besu network rather than a public data-availability layer, and state roots are posted to multiple Layer 1 chains instead of one, which is the basis for the "multi-ledger" claim. Quant Network Ltd runs the sequencer.

Unified tokens and trusted nodes

Two features distinguish it from a conventional Layer 2. The first is unified tokens, or uTokens, such as uUSDC and uBUIDL. Rather than locking an asset on one chain and minting a wrapped copy on another, Fusion aims to represent a single asset across connected chains without a lock-and-mint bridge. The second is the Trusted Node model: transaction processing is done by operators who have passed know-your-customer checks and can be selected by jurisdiction, so a bank can require that its transactions are processed only by nodes in, say, the United Kingdom. Contract-level privacy is configurable, and a component Quant calls the Fusion Firewall screens transactions. Quant says the architecture is patented.

What it means for QNT

QNT is designated as Fusion's token for gas and execution fees, and Trusted Node operators are expected to stake QNT to process transactions and earn rewards. That is a genuine change: for the first time the token has a role inside a system that moves value, not just at the licence desk. But as of November 2026 the minimums, lock-ups and yields for node staking have not been published, and several trackers still list the programme as upcoming. Until the parameters appear, the staking page treats it as planned rather than live.

QuantNet

QuantNet was announced in late September 2025, within days of UK Finance selecting Quant for the tokenised sterling deposit project, and Quant describes it as a programmable settlement network, the trust layer between the Overledger gateway and the Fusion execution environment. Public documentation is thinner than for Fusion. What can be said with confidence is where it sits in the stack and what it is meant to do: give institutions a shared network on which tokenised deposits and other regulated liabilities settle with rules attached. The Clearing House's On-Chain Money Initiative, for which Quant provides the interoperability, orchestration and transaction-management layer, is the closest real-world description of what a QuantNet-style network would do; the partnerships page covers that selection.

Developer hub and GitHub

The developer entry point is docs.overledger.dev, branded as the Quant Developer Hub. Its API reference is grouped into RPC, deposits, contracts, stakes, nodes, networks, flow sessions, flow registry, flow query, webhooks, swaps, withdrawals and a tracker, with guides on the Fusion rollup, the Firewall and staking. The live list of connected networks comes from a GET /networks call rather than a web page. Two older hostnames, docs.quant.network and developer.quant.network, no longer resolved on 2 November 2026, so ignore guides that link to them.

Quant's GitHub organisation is verified and held fifteen public repositories at the time of writing. Most of the SDKs, including the JavaScript SDK v2 and the demo application, are archived. The active repositories are the PayScript language specification, the op-geth fork underlying Fusion, and a secure-asset-exchange protocol repository with message definitions for the SATP standard. A community-treasury contract from the 2021 Overledger Network design is archived, which is a useful signal that the gateway-operator model has been superseded. If you want to see Overledger activity rather than read about it, the transaction tracker shows QNT transfers on Ethereum in real time.

Pricing model

Quant's pricing has gone through three phases, and only the first two are documented precisely. In 2021 Overledger was free to all businesses. On 10 December 2021 Quant introduced an annual licence of £100 for every live-platform customer and developer, payable in QNT and due from 15 March 2022 for existing users, with the test platform free. The current FAQ, read on 2 November 2026, says pricing is available by contacting sales, that plans renew monthly or annually, and that a platform fee can be paid in US dollars or by subscribing with QNT.

The practical consequence for token holders is that the share of Quant's revenue that flows through QNT is not disclosed. Neither the UK tokenised deposit programme nor The Clearing House has said that banks must buy or hold QNT, and the fiat option in the FAQ means they need not. Anyone modelling token demand from product adoption should start from that fact, which the review weighs against the project's strengths.