Overledger 2.2.3 supports Polygon and new tier-two QRC-20 smart contracts


This release unlocks access to Polygon mainnet, increases API support for Polygon Mumbai testnet and provides new APIs for tier-two QRC-20 smart contract functions.  

04 April 2022

Overledger 2.2.3 provides new access to Polygon mainnet and increases API support for Polygon Mumbai testnet. It also introduces new APIs for tier-two QRC-20 smart contract functions to issue payments and easily retrieve a list of supported tokens from Overledger.  

As part of this release, we have extended ERC-20 token support for the top five tokens on Polygon mainnet, including:  

  • Wrapped Ether (WETH)
  • USD Coin (USDC)  
  • Tether USD (USDT)  
  • Wrapped Matic (WMATIC)  
  • Dai Stablecoin (DAI)  

Developers will also be able to use our API for QRC-20 smart contract invoke to interact with smart contracts on the Polygon Mumbai testnet and mainnet networks. This release completes support for all available Ethereum-based functions for Polygon.  

This release also includes two new APIs on Overledger; the first makes a QRC-20 payment as a secondary account owner on behalf of the account owner. The second API enables developers to retrieve a list of supported ERC-20 and QRC-20 tokens and their supported functions.  

For more information, please read the release notes here.


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