Bitcoin cloud mining
First services for renting bitcoin mining hardware was born in 2011 and provide only GPU mining farm.
When ASIC mining hardware going to the mass production several manufactures created mining pools, where you can mine on rented or our own mining hardware.
Cloud mining services usually offer mining contracts. But today's we have several cloud mining services where mining hardware owners can sell hashing power to potential buyers. Such mining services usually do not have mining hardware and offer you to buy or sell hashing power without contracts on pay-as-you-go basis.
We can't recommended any cloud mining services at the moment.