# Blockspace itself markets

Where new blockspace trades: 6 venues, from blockspace.markets' directory.

URL: https://blockspace.wiki/markets/blockspace/

Where new blockspace is bought: the fee market and the services that sell priority. 6 venues in blockspace.markets' directory, 6 of them live, as of 2026-10-21. Listed by name; nothing here is a ranking or a recommendation. Every fact gives its source and date; a source marked third-party is not the venue's own; "not found" means the directory found no source for it. Dead venues stay listed with the date they were checked.

### Binance Pool Transaction Accelerator

- Type: accelerator
- Settlement: custodial
- Custody: custodial
- Status: live, checked 2026-10-21 (evidence)
- Fees: not found
- API: none
- Volume: not found
- On the buy board: not read: no listing book

Scheduled to close with Binance Pool on 2026-11-10 07:00 UTC (third-party report; Binance's own announcement not retrieved). Price model not verified; access was limited to VIP users and a Telegram channel.

### Bitcoin public fee market (the mempool)

- Type: fee-market
- Settlement: on-chain
- Custody: non-custodial
- Status: live, checked 2026-10-21
- Fees: not found
- API: open · docs
- Volume: not found
- On the buy board: not read: no listing book

A pay-as-bid auction on fee rate (sat/vB), paid inside the transaction to the miner that includes it; bids can be raised with RBF or CPFP. On 2026-10-21 the next-block estimate was 1 sat/vB and the precise floor 0.1 sat/vB.

### Luxor Derivatives (hashrate forwards)

- Type: derivative
- Settlement: off-chain
- Custody: not found
- Status: live, checked 2026-10-21 (evidence)
- Fees: not found
- API: none
- Volume: not found
- On the buy board: not read: no listing book

A derivative on hashrate and hashprice, not a claim on block inclusion; fees are only indirect exposure. Physically or cash settled OTC forwards after KYC/AML and ISDA onboarding; no fee schedule published; API not verified.

### MARA Slipstream

- Type: accelerator
- Settlement: on-chain
- Custody: non-custodial
- Status: live, checked 2026-10-21 (evidence)
- Fees: Minimum fee rate is the higher of 1x the current mempool priority fee rate or 1 sat/vByte; volume discounts by contact · slipstream.mara.com/docs/openapi.json, 2026-10-21
- API: open · docs
- Volume: not found
- On the buy board: not read: not read yet

Direct submission to MARA Pool's private mempool, meant for non-standard or large transactions; the fee goes inside the transaction and it only reaches blocks MARA Pool mines. A 2026-08-03 report that it became free and permissionless is not verified.

### Mempool Accelerator (mempool.space)

- Type: accelerator
- Settlement: off-chain
- Custody: custodial
- Status: live, checked 2026-10-21 (evidence)
- Fees: Acceleration cost includes the fee to boost to your selected target fee rate and the Mempool Accelerator service fee; no numeric service-fee rate published · mempool.space/accelerator, 2026-10-21
- API: open · docs
- Volume: not found
- On the buy board: not read: not read yet

Paid off chain (Lightning, Cash App Pay, Apple Pay, Google Pay; Pro accounts preload credit) and relayed to partner mining pools; an acceleration cannot be modified or canceled by the user. Read endpoints are open; account endpoints need a login.

### ViaBTC Transaction Accelerator

- Type: accelerator
- Settlement: custodial
- Custody: custodial
- Status: live, checked 2026-10-21 (evidence)
- Fees: 0 free accelerations per hour shown; paid fee shown after entering a TXID and deducted from your ViaBTC account; non-cancellable and non-refundable · www.viabtc.com/tools/txaccelerator, 2026-10-21
- API: none
- Volume: more than 800,000 transactions, since 2016 · www.viabtc.com/en/blog/News-viabtc-partners-with-mempool-to-expand-access-to-btc-transaction-acceleration-services-802, 2026-09-16
- On the buy board: not read: no listing book

Pool priority at ViaBTC; a sign-in is required and payment is in BTC, BCH or LTC. A 2026-09-16 partnership with Mempool is announced, but how it works is not verified.

Sources:

- blockspace.markets' directory of venues (markets.json, re-checked weekly) · https://blockspace.markets/data/markets.json
- blockspace.markets: the markets directory · https://blockspace.markets/markets/

Updated: 2026-10-21