Data Sources
Providers are selected for clear attribution, stable machine-readable output and a documented update policy.
mempool.space
Bitcoin recommended fee estimates. Refreshed every five minutes.
Etherscan
Ethereum gas oracle. Refreshed every five minutes and visibly attributed.
CoinGecko
BTC, ETH and stablecoin prices plus cached daily history. Refresh cadence depends on the dataset.
Alternative.me
Crypto Fear & Greed Index. Refreshed daily with attribution beside the value.
Failure policy
The last successful value may be shown as Stale for a limited period. After that, the metric becomes Unavailable.