Bitcoin blockchain browser Mempool has launched a under-the-necklace service designed to help users speed up unconfirmed transactions by paying additional miner fees and service fees. The service, called Mempool Accelerator, will "confirm stuck transactions by paying out-of-band fees," the project notes. Users can find the transaction on the mempool.space, select the acceleration option from the transaction page, and then pay bitcoin via Lightning Network or fiat currency via Cash App, Apple Pay, or Google Pay without registration.