Ring USD (USDR) is a stablecoin that operates on the Ethereum blockchain and is part of the broader Ring Protocol ecosystem. It is categorized as a USD Stablecoin and is designed to be traded on decentralized exchanges (DEXs). ^{[1] [2]}​

Overview

Ring USD is intrinsically linked to its parent project, Ring Protocol. The protocol's stated mission is to address liquidity inefficiencies in the DeFi sector by connecting "billions of idle assets" on-chain with crypto projects that require liquidity. The project's vision is "to build an universal liquidity protocol for maximizing asset utilization." The protocol's technology is built for Ethereum Virtual Machine (EVM) compatible blockchains, with a specific focus on the Ethereum and Blast networks. ^{[2] [3]}

Tokenomics

The Ring Protocol ecosystem utilizes multiple tokens, each with a specific function. While USDR serves as the protocol's stablecoin, other tokens facilitate liquidity provision and governance.

Ring USD (USDR)

Ring USD is classified as a USD Stablecoin that primarily operates on the Ethereum blockchain as an ERC-20 token. ^[1]​

• Supply Model: USDR operates with a fixed supply. As of December 2025, the total supply and the circulating supply were identical at 100,400,000 USDR. ^{[1] [2]}
• Maximum Supply: Despite its fixed circulating supply, the theoretical maximum supply for USDR is listed as infinite, suggesting that more tokens could potentially be minted in the future. ^[1]
• Blockchain Presence: USDR exists on multiple blockchains. Its primary network is Ethereum, but it is also available on the BNB Smart Chain. ^{[1] [2]}

Contract Addresses

Ring USD can be found on multiple EVM-compatible blockchains. The official contract addresses are:

• Ethereum: 0x4ea40dcee961675683e0a2e1721bd49cb9bca913
• BNB Smart Chain: 0x021988d2c89b1A9Ff56641b2F247942358FF05c9

The existence of these contracts allows USDR to be bridged and utilized across different DeFi ecosystems. ^{[1] [2]}​