Bitcoin blockchain explorer Mempool has launched an off-chain service that aims to help users expedite unconfirmed transactions by paying an extra miner fee and service charge.

Known as Mempool Accelerator, the service will get “stuck transactions confirmed by paying an out-of-band fee,” the project noted. Users can locate a transaction on mempool.space, select the accelerate option from the transaction page and pay in bitcoin via Lightning or fiat via Cash App, Apple Pay or Google Pay with no sign-up process.

There are five initial mining pool partners for the service: Foundry USA Pool, MARA Pool, SBICrypto, SpiderPool and Ocean Pool, which account for around 40% of Bitcoin’s global hashrate, according to the firm.

Mempool sends the acceleration request to its mining pool partners, …