BlockDailyChain is built around two practical questions: what does an on-chain action cost now, and what remains after realistic fees?
The website combines a small set of automatically updated data pages with evergreen calculators. It does not publish automated news summaries and does not require a language-model API for routine operation.
1. Fetch
The BlockDailyChain server requests a fixed set of machine-readable endpoints:
- mempool.space for recommended Bitcoin transaction fee rates;
- Etherscan for Ethereum gas estimates;
- CoinGecko for BTC, ETH and stablecoin prices and cached historical series;
- Alternative.me for the Crypto Fear & Greed Index.
API keys remain on the BlockDailyChain server and are not included in page HTML, calculator JavaScript or public widgets.
2. Validate
Provider responses must contain the expected fields and valid numeric values. A failed request is never silently converted into zero or presented as a healthy current reading.
3. Cache
One server-side snapshot is reused for all visitors. Page views therefore do not create a new external API request each time.
- Bitcoin fee and Ethereum gas data refresh approximately every five minutes.
- CoinGecko market and stablecoin prices refresh approximately every fifteen minutes.
- BTC and ETH historical series refresh once per day.
- The Fear & Greed Index refreshes once per day.
Actual update time can vary slightly because WordPress scheduled tasks depend on server configuration and website traffic.
4. Label
Each live value includes its source and update status:
- Fresh means the cached reading is within its normal display window.
- Stale means the last successful reading is being retained temporarily.
- Unavailable means the reading is too old or no valid snapshot exists.
A freshness label describes cache age, not guaranteed accuracy. Important values should always be verified with the attributed provider and your wallet.
5. Calculate locally
The Profit After Fees, Average Buy Price, Market Cap and Satoshi Converter calculations run entirely in your browser. The values you enter are not submitted to BlockDailyChain by the calculator code.
The Historical DCA Calculator downloads BlockDailyChain’s cached daily price series and then performs the recurring-purchase scenario locally.
6. Embed
Public iframe widgets display the same cached readings with BlockDailyChain and provider attribution. Website owners can copy an iframe from the Widgets page without receiving or exposing an API key.
7. Failure handling
If a provider is temporarily unavailable, BlockDailyChain may show the last successful value as Stale for a limited period. Once the allowed period expires, the value becomes Unavailable. Provider failures do not alter calculator formulas or previously cached historical series.
Costs and automation
The automatic pipeline uses scheduled API requests and browser-side arithmetic. Routine language-model token usage is zero. Provider usage is bounded by the server cache rather than visitor count.
For provider details and update policies, see Data Sources and Methodology.
Questions and corrections
To report a problem, email the page URL, displayed timestamp, provider name and a short description to mail@blockdailychain.com.