bitcoin
Provider-declared label. Inspect each service’s documented actions and access requirements.
Services are ordered by documented operations, attributed reports and current documentation. 2 services are classified here. Each card shows the interfaces a service offers; open it for access requirements and sources.
Categories · Tasks · Interfaces · How listings are checked
Twenty-One Million
Twenty-One Million is an educational Bitcoin website with a public JSON Bitcoin halving API that calculates the halving era, block subsidy, and blocks until the next halving from a supplied block height.
Developer tools · bitcoin · Public data
API · Access documentation verifiedBlock Genomics
Block Genomics documents a public registered-block lookup that returns the recorded owner for a Bitcoin block height.
blockchain data · Bitcoin · API
API · Documentation checked: 2026-10-11