# space.market

The primary market for Bitcoin blockspace: what a kilobyte in the next block costs.

URL: https://blockspace.wiki/projects/space.market/

Status: live (since 2026-10-20)
Site: https://space.market

## What it is

space.market is "the primary market for Bitcoin blockspace": what a kilobyte
in the next blocks costs, meaning the [fee rate](https://blockspace.wiki/glossary/fee-rate/) a new transaction pays to
get its bytes into a block. Blockspace already used and resold, as
inscriptions and tokens, is the secondary market, at
[blockspace.markets](/projects/blockspace.markets/).

## Status

Live at https://space.market since 2026-10-20. It is rebuilt every 10
minutes from [Blockspace Holdings' own Bitcoin node](https://blockspace.wiki/glossary/blockspace-holdings-node-and-indexers/).

## How it works

A kilobyte is 1,000 [vbytes](https://blockspace.wiki/glossary/vbytes/), a transaction's weight divided by 4, and its
cost is the fee rate times 1,000 vB. The site shows four prices: the node's
fee estimates for confirmation within 2, 3 and 6 blocks, and the median fee
rate of the block the node would hand a miner now. It shows the [mempool](https://blockspace.wiki/glossary/mempool/)
too. When the estimator and recent blocks disagree, both are shown: the
estimator does not go below 1 sat/vB, while recent blocks have confirmed
transactions below that (see [relay policy](/concepts/relay-policy/)).
Neither number is a promise that a transaction will confirm.

## Key figures

From space.market's reading (as of block 972,331, 2026-10-20 13:08:54 UTC):
- 1 kB within the next blocks: 1,010 sats; within 6 blocks: 1,010 sats;
- the median fee rate in the node's block template: 2.117 sat/vB;
- the mempool held 24.7 blocks' worth of transactions.

## FAQ

### How is space.market different from blockspace.markets?

space.market prices new bytes: what space in the next blocks costs, from the fee rate a new transaction pays. [blockspace.markets](/projects/blockspace.markets/) prices bytes already consumed: inscriptions and tokens resold, per kilobyte. One is the primary market for blockspace, the other the secondary market.

### What is a kilobyte there?

1,000 virtual bytes: a transaction's weight divided by 4. The cost of 1 kB is the fee rate in sat/vB times 1,000, in sats.

### Can I buy blockspace there?

No. It shows prices; it sells nothing and takes no transaction (as of 2026-10-20).

Sources:

- space.market: what a kilobyte in the next Bitcoin block costs · https://space.market
- space.market's reading, rebuilt every 10 minutes (data/now.json) · https://space.market/data/now.json
- Blockspace Holdings records
- The project list at block.space/projects · https://block.space/projects
- The blockspace.markets site: README, tools/build.py and the page · https://blockspace.markets

Live figures: spacemarket as of block 972,331, 2026-10-20 13:08:54 UTC

Updated: 2026-10-20