Introducing Overledger 2.1.1


The latest release of Overledger provides support for the Ethereum London hard fork.

EIP-1559 is expected to lead to faster transaction processing times and lower fees, which  Overledger 2.1.1 users will benefit from. And because the latest version of Overledger has transparent backward compatibility, developers can carry on using Ethereum networks that have not implemented EIP-1559.  

The underlying technology stack and framework versions of Overledger have been upgraded with this release and improvements have been made to APIs to:

  • Enhance Open API 3.0 compliance
  • Clarify array definitions and validations
  • Clearly define string parameters and validations
  • Ensure ‘schemes’ are clearly defined as HTTPS only  

With Overledger 2.1.1, API documentation for requests, responses and examples are generated programmatically and made accessible on
Lastly, Quant has implemented the backend functionality that will allow developers to pay for license fees using Metamask. The outstanding UI changes and integrations will be part of a future release.  

For more details, see the full release notes: Release notes 2.1.1

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Overledger 2.x

Overledger 1.x


OAuth 2.0 standard (allowing SSO)

Proprietary (BPI Keys)


In API, seamless updates

In SDK, re-download for updates


Full abstraction across all DLTs

Partial, DLT-specific edge cases

RCG Framework

REST / JSON APIs from OVL Core

Proprietary P2P (experimental)

Time to Deploy

32 minutes (CI / CD pipelines)

1-2 weeks

QNT Utility Token / Treasury

Optimised, audited smart contracts

Experimental smart contracts


Optimised to scale fast – 23 Microservices

Hardened proof of concept
– 9 Microservices

Transaction Routing Algorithm

6 factor, game theory optimised

Experimental P2P emergent


Cloud native (scaling / resilience)

Standalone DB deployments

Cross-DLT Implementation

REST API calls direct to OVL, integrated smart contract back end

SDK-based Javascript 
apps call smart contract functions
via OVL

2021 Achievements

50% Quant team has grown by over 50% and will continue to do so 

OVL1.0 to 2.0 Release schedule accelerated, moved to much more frequent automated updates
– Previously, last major update was seven months, then in early 2021 moved to three months (Jan and March)
and then to monthly (April and May). We’re now moving to fortnightly releases. 

2.5X Overledger is now 2.5x bigger (April)  

2.0 Re-engineered the entire 2.0 architecture

Open API 3.0 for easy integration into developer workflows

OAuth 2.0 for single sign on for enterprise customers    

Cloud Native Scalable and resilient already, now deployable automatically 

Native Transactions 

OVL 2.0 Developer portal 2.0