FIDD, issued by Fidelity Digital Assets, National Association, is a fiat-backed payment stablecoin that represents a 1:1 claim redeemable for one U.S. dollar (USD) from the issuer and is structured for payment use rather than investment return [S1].

Each FIDD unit tracks the U.S. dollar (USD) at a fixed 1:1 peg, with holders buying and redeeming at a fixed $1 price on Fidelity platforms [S1]. The token is fully collateralized, with at least $1 in reserves of cash and U.S. Treasury securities held for every unit in circulation; those reserves are managed by Fidelity Management & Research Company LLC and custodied at Bank of New York Mellon [S1]. FIDD does not create investment returns for users [S1].

FIDD is issued by Fidelity Digital Assets, National Association, a U.S. national entity operating under an Office of the Comptroller of the Currency (OCC) charter [S1]. The holder's claim is a payment stablecoin redeemable 1:1 for USD; it is not legal tender and is not FDIC- or SIPC-insured or government-guaranteed [S1]. To transact, a user must hold a Crypto Account in good standing with Fidelity Digital Assets, and only retail users resident in eligible listed jurisdictions may purchase or redeem, alongside institutional clients [S1]. Each unit is redeemable solely from Fidelity Digital Assets for one USD [S1].

FIDD operates on the Ethereum blockchain [S1]. Units are purchased from and redeemed with Fidelity Digital Assets at a fixed 1 USD per unit, and offchain holders may transfer FIDD to Ethereum mainnet wallet addresses, except those Fidelity Digital Assets has frozen or restricted [S1]. Reserve reports are prepared monthly and examined by PricewaterhouseCoopers LLP, with circulating supply and reserve NAV disclosed each business day [S1].

<Sources
  retrievedAt="2026-06-21"
  items={[
    { id: "S1", url: "https://www.fidelity.com/learning-center/trading-investing/FIDD-stablecoin" },
  ]}
/>


# Asset senders (weekly) methodology

## 1. Overview

`Asset senders (weekly)` is defined as the number of unique addresses that initiate asset transfers over a rolling 7-day period. For each tracked asset, outgoing transactions are analyzed to identify the addresses responsible for moving tokens. This metric is utilized as a key indicator of weekly user activity and transactional engagement for tokenized assets across various blockchain networks. By aggregating unique sending addresses within a moving 7-day window, short-term fluctuations are smoothed out to provide a clearer view of active adoption.

## 2. Data sources

- **EVM chain events**: ERC-20 token transfers, covering EVM-compatible chains (Ethereum, Arbitrum, Base, Polygon, Optimism, and others)
- **Solana instructions**: Token transfer instructions
- **Other blockchain data**: Token transfer and withdrawal events from Aptos, Near, Polkadot Asset Hub, Stellar, Sui, Ripple, and others
- **Asset metadata**: Token contract addresses and asset mapping datasets

## 3. Step-by-step calculation

### Component A: Extraction of daily sending addresses

- **Purpose**: Identify and extract unique addresses initiating token transfers on a daily basis for each asset.
- **Logic**: On EVM-compatible chains, sending addresses are extracted from ERC-20 token transfers where the sender address is not the null address. On Solana, sending addresses are identified from token transfer instructions using the authority address. On Aptos, Sui, Cardano, and Stellar Classic, sending addresses are retrieved from token withdrawal events. On Stellar Soroban, transfers are parsed from Soroban token transfer events, excluding mint transactions where the sender address is null. On Polkadot Asset Hub, `Transferred` events from the `assets` pallet are parsed to identify the sender. On Ripple, outgoing transfers are identified where the transaction value is negative. On Near and Injective, sending addresses are extracted from token transfer events where the sender address is populated.
- **Key fields**: `timestamp` (block time truncated to the day), `token_address` (the contract or asset identifier), `sender_address` (the address initiating the transfer)

### Component B: Rolling 7-day window aggregation

- **Purpose**: Aggregate daily active senders into a rolling 7-day window to calculate weekly activity.
- **Logic**: A daily datespine is generated to establish a continuous timeline. For each day in the timeline, a rolling 7-day window is constructed by looking back at the preceding six days. Daily unique sending addresses are mapped to each active window based on their transaction timestamps.
- **Key fields**: `timestamp` (the reference day for the rolling window), `token_address` (the asset identifier), `sender_address` (the address active within the window)

### Component C: Final deduplication and aggregation

- **Purpose**: Calculate the final weekly unique sender count per asset and chain.
- **Logic**: Within each rolling 7-day window, sending addresses are deduplicated to ensure each unique address is counted only once per asset, regardless of transaction frequency. The deduplicated counts are aggregated at both the individual chain level and the global asset level. Missing dates are filled with zero values to maintain a continuous time series.
- **Key fields**: `timestamp` (the reference day), `chain_id` (the blockchain identifier), `token_address` (the asset contract address), `asset_senders_weekly` (the count of unique weekly sending addresses)

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

Unique asset senders over a rolling 7-day window.

Asset senders (weekly)

Stablecoins

Fidelity-issued tokens are deployed on regulated tokenization platforms (e.g., Sygnum Desygnate) and represent fractional interests in underlying money-market and treasury portfolios, with NAV mechanics managed by Fidelity Asset Management.

Fidelity issues tokenized money-market and digital-asset products through Fidelity International and Fidelity Digital Assets, including the USD Digital Liquidity Fund (FILQ) and the Fidelity Digital Dollar stablecoin.

Fidelity Investments is one of the world's largest financial services providers, managing over $14 trillion in assets for institutional and retail clients globally.

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Real-world asset (RWA) issuers

Fidelity

Fidelity Digital Dollar (FIDD) is a U.S. dollar stablecoin issued by Fidelity through Fidelity Digital Assets, National Association.

Each token is redeemable one-for-one for U.S. dollars and is a direct claim on the issuer.

Reserves are held in accounts segregated from the issuer's own funds.

Retail investors and institutions can mint and redeem directly with Fidelity in USD after completing KYC, and holders have a contractual right to redeem at par.

Fidelity Digital Assets, National Association is chartered as a U.S. national trust bank and is supervised by the Office of the Comptroller of the Currency (OCC).

Holder terms are governed by the law of New York in the United States.

FIDD has been issued on Ethereum as an ERC-20 token since April 2023.

Fidelity Digital DollarFIDD