Methodology

> Data_Sources

All data displayed on cbwrapped comes from three sources:

• >On-chain RPC — Supply data is read directly from public blockchain smart contracts by calling totalSupply() on each token contract. No internal Coinbase APIs are used.
• >Dune Analytics — DEX trading volume is sourced from Dune Analytics, which indexes and aggregates on-chain swap events.
• >CoinGecko — Price data is sourced from the CoinGecko API to display USD-denominated values.

> Supply_Calculation

For each wrapped asset, we call totalSupply() on the token’s smart contract on every chain where it is deployed. The per-chain values are summed to produce the total circulating supply.

On EVM chains (Ethereum, Base, Arbitrum), this is a standard ERC-20 totalSupply() read call. On Solana, we read the mint account’s supply field.

Each contract’s decimals value is used to convert the raw integer response into a human-readable token amount. The poller runs every 5 minutes via Vercel Cron and stores each reading in PostgreSQL with a timestamp for historical tracking.

> Price_Data

USD prices are fetched from the CoinGecko /api/v3/simple/price endpoint. Requests are batched (all asset IDs in a single call) to minimize API usage. Prices are cached in Redis with a 5-minute TTL, so displayed prices may lag the market by up to 5 minutes.

Price data is used solely for display purposes (e.g., converting supply counts to USD market cap estimates) and does not affect the underlying supply calculations.

> Volume_Data

Volume data is collected through two mechanisms:

1. [01]Real-time polling — The Dune DEX Pair Stats API is polled every 30 minutes to capture recent swap activity for each tracked pair.
2. [02]Daily batch — A daily SQL query runs against Dune to aggregate 24-hour volume totals. This provides a more complete picture that accounts for any gaps in real-time polling.

> Update_Frequency

> Known_Limitations

• !RPC failures — If an RPC provider is unavailable, the most recent successful reading is displayed with a “stale” indicator. Supply data is never estimated or interpolated.
• !Dune lag — Dune Analytics indexes on-chain data with an approximate 30-minute delay. Volume figures may not reflect the very latest trades.
• !CoinGecko rate limits — The free tier of the CoinGecko API has rate limits. During periods of high traffic, price updates may be temporarily delayed.
• !Solana supply — On Solana, the supply figure reflects the mint account supply and may not account for tokens that have been burned to addresses other than the zero address.

> Tracked_Assets

cbwrapped currently monitors 6 Coinbase wrapped assets. The table below lists each asset, its deployments, and links to the relevant block explorers where the contract can be independently verified.