USDD, issued by the USDD Protocol smart contracts under the governance of community tokenholders, is a crypto-collateralized stablecoin pegged 1:1 to the U.S. dollar (USD) and administered without a central authority [S1][S2][S3].

Each USDD targets a stable value of one USD and carries no price appreciation [S1]. The token is minted against over-collateralized vaults holding eligible crypto assets such as TRX, sTRX, USDT, USDC, and SA001, organized into ilks like TRX-A and TRX-B [S3][S4][S5]. Vault minting incurs an annualized stability fee repayable with the minted USDD; Peg Stability Module swaps charge no service fee beyond network gas [S6][S4][S7][S8]. Holders may deposit USDD into the Savings module to mint yield-bearing sUSDD, whose USDD value increases over time [S9].

USDD operates without a central authority and has no named corporate legal entity issuer, instead being community-governed and administered through smart contracts via transparent proposals and onchain voting [S1][S2][S10]. The holder's claim is a bearer-style crypto token that is tamper-proof and cannot be frozen, backed by collateral held in publicly verifiable, non-custodial smart contracts rather than by an offchain custodian owing redemption [S1][S3]. Users must be at least 18 years old, and access is restricted in Mainland China, Taiwan, Hong Kong, the United States, and Singapore [S4]. Vault holders redeem by repaying debt to free collateral; PSM users swap USDD for a supported stablecoin such as USDT at 1:1 [S4][S7][S8].

USDD follows the native token standard of each supported network, operating across the TRON, Ethereum, and BNB Chain networks [S3][S5]. Users mint by depositing eligible collateral and specifying an amount, or by exchanging a supported stablecoin through the PSM, which burns USDD on redemption [S4][S3][S7]. Onchain price oracles using Median and OSM contracts price collateral, and settlement is onchain [S3][S7][S8].

<Sources
  retrievedAt="2026-06-19"
  items={[
    { id: "S1", url: "https://docs.usdd.io/introduction/readme.md" },
    { id: "S2", url: "https://docs.usdd.io/introduction/readme.md?ask=What%20is%20the%20legal%20entity%20issuer%20of%20USDD" },
    { id: "S3", url: "https://docs.usdd.io/system-architecture/system-architecture.md" },
    { id: "S4", url: "https://docs.usdd.io/introduction/readme.md?ask=How%20do%20users%20mint%20USDD%20using%20vaults%20and%20what%20are%20the%20eligibility%20requirements" },
    { id: "S5", url: "https://docs.usdd.io/introduction/collateral-asset-contract-addresses.md" },
    { id: "S6", url: "https://docs.usdd.io/introduction/readme.md?ask=What%20are%20the%20stability%20fees%20and%20disclaimers" },
    { id: "S7", url: "https://docs.usdd.io/user-guide/psm-peg-stability-module.md" },
    { id: "S8", url: "https://docs.usdd.io/developers/core-contracts/psm" },
    { id: "S9", url: "https://docs.usdd.io/user-guide/usdd-savings.md" },
    { id: "S10", url: "https://docs.usdd.io/governance/overview.md" },
  ]}
/>


# Asset transfer count methodology

## 1. Overview

Asset transfer count is defined as the number of user transactions that move assets between addresses. It is utilized to reflect how frequently assets are used for payments, trading, or other onchain activity. The metric is calculated daily for each tracked asset across all supported blockchains. By aggregating these transfer events, a comprehensive view of onchain utility and transactional velocity is provided.

## 2. Data sources

- **EVM chain events**: ERC-20 token transfers, covering EVM-compatible chains (Ethereum, Arbitrum, Base, Polygon, Optimism, and others)
- **Solana instructions**: SPL token transfers
- **Other blockchain events**: Token transfers, withdrawals, and mint events across non-EVM chains (Solana, Aptos, Near, Polkadot Asset Hub, Stellar, and others)
- **Asset metadata**: Token addresses and decimal precision

## 3. Step-by-step calculation

### Component A: Extract and count raw transfer events

- **Purpose**: Identify and count individual token transfer events on a daily basis for each asset.
- **Logic**: On EVM-compatible chains, ERC-20 token transfers are parsed and counted. On Solana, SPL token transfers are parsed and counted. On Aptos, Near, and Ripple, token transfers and withdrawals are parsed and counted. On Stellar, classic token withdrawals and Soroban token transfers are aggregated. On Sui, token withdrawals and token mint events are aggregated. On Cardano, UTXO withdrawals and token mint events are aggregated. On Polkadot Asset Hub, `Transferred` events from the `assets` pallet are parsed.
- **Key fields**: `token_address`: The unique identifier of the token contract or asset. `block_timestamp`: The timestamp of the transaction block.

### Component B: Daily aggregation and zero-filling

- **Purpose**: Aggregate the daily transfer counts per asset and ensure continuous time-series data.
- **Logic**: The extracted transfer counts are aggregated daily for each token address on its respective chain. For days where no transfer activity is recorded for a tracked asset, the time series is filled with zero values to ensure a continuous daily record.
- **Key fields**: `timestamp`: The day of the activity. `asset_transfer_count`: The daily count of transfers per token on a specific chain.

### Component C: Final aggregation

- **Purpose**: Combine the daily transfer counts across all supported chains for each asset.
- **Logic**: The daily transfer counts from all individual chains are combined. Token addresses are mapped to unique asset identifiers using asset metadata. The final daily asset transfer count is then aggregated across all chains for each asset.
- **Key fields**: `timestamp`: The day of the activity. `asset_transfer_count`: The total aggregated daily transfer count for the asset.

*This methodology was automatically generated by Token Terminal's methodology analyzer.*

Number of transfer transactions involving the asset.

Asset transfer count

Stablecoins

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Stablecoin issuers

Tron USDD

Tron USDD (USDD) is a U.S. dollar stablecoin issued by Tron USDD.

Retail investors, professional investors, accredited investors, qualified investors, qualified purchasers, and institutions can mint and redeem directly with Tron USDD in USDT, and holders have a contractual right to redeem at par.

USDD has been issued on public blockchains since May 2022 and is native to Arbitrum One, Avalanche, Tron, BNB Chain, and Ethereum.

Tron USDDUSDD