Bitcoin halving countdown from a block height
Bitcoin halving countdown from a block height: next halving height, blocks and days remaining, estimated date, current subsidy and coins mined so far.
Answeringour last check, 2026-10-20
1 of 1checks answered this week
280 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/btc/halving
| Category | Market data |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.01 | 280 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"as_of": "2026-10-17",
"current_height": "971900"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}