{"slug":"saylorinnovations-com-api-btc-halving-712d48","title":"Bitcoin halving countdown from a block height","host":"saylorinnovations.com","method":"GET","resource":"https://saylorinnovations.com/api/btc/halving","category":"market","description":"Bitcoin halving countdown from a block height: next halving height, blocks and days remaining, estimated date, current subsidy and coins mined so far.","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":280,"reported_calls_30d":0,"reported_payers_30d":0,"networks":["eip155:137","eip155:42161","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"as_of":"2026-10-17","current_height":"971900"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"as_of":{"description":"optional date the height was observed, default now","type":"string"},"current_height":{"description":"current block height (see /api/btc/network)","type":"string"}},"required":["current_height"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"avg_block_minutes_assumed":{"description":"Average block time assumed","type":["number","null"]},"blocks_remaining":{"description":"Blocks until the next halving","type":"number"},"current_era":{"description":"Which halving era the height is in (1 is the original 50 BTC era)","type":"number"},"current_height":{"description":"Block height supplied","type":"number"},"current_subsidy_btc":{"description":"Block subsidy in the current era","type":"number"},"estimated_days_remaining":{"description":"Days until the next halving at the assumed block time","type":"number"},"estimated_halving_date":{"description":"Estimated UTC time of the next halving","type":"string"},"max_supply_btc":{"description":"Maximum bitcoin supply","type":"number"},"next_halving_height":{"description":"Block height of the next halving","type":"number"},"next_subsidy_btc":{"description":"Block subsidy after the next halving","type":"number"},"note":{"description":"Plain-language caveat about how to read and use the result","type":"string"},"progress_through_era_percent":{"description":"How far through the current era the height is","type":"number"},"source":{"description":"Where the data or formula comes from","type":"string"},"subsidy_issued_per_day_btc":{"description":"New bitcoin issued per day at 144 blocks","type":"number"},"supply_mined_btc":{"description":"Cumulative subsidy issued by this height","type":"number"}},"required":["next_halving_height","estimated_halving_date"],"type":"object"},"type":{"const":"json","type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-20","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.01,"price_match":true,"latency_ms":280,"error":null}],"description_full":"Bitcoin halving countdown from a block height: next halving height, blocks and days remaining, estimated date, current subsidy and coins mined so far.","last_updated":"2026-10-20T14:44:40.737Z","schemes":["exact"]}