Mining as a service is covered in full under cloud mining, which explains the main contract types, how returns are calculated and the risks involved. This page explains the name and the services it can describe.
In a mining-as-a-service arrangement, a customer pays a provider for a share of mining capacity, measured as hashrate, for a set period. The provider owns or leases the machines, usually in a large mining farm, and pays the customer a share of the coins mined after deducting electricity and maintenance fees. The customer avoids buying hardware, finding cheap power and dealing with noise, heat and repairs. The phrase is sometimes shortened to MaaS, an abbreviation shared with unrelated services such as metaverse-as-a-service.
"Mining as a service" is also used for hosting deals, where a miner owns machines but pays a provider to house and run them, and for platforms that rent out hashrate by the hour. The two names overlap, and providers use them interchangeably.
The model has a poor record. Returns depend on coin prices, network difficulty and fees, and many contracts become unprofitable well before they end. Fake cloud-mining platforms have also been a common vehicle for fraud, paying early customers from later deposits in the manner of a Ponzi scheme. Customers are advised to check who owns the machines, where they are located and how payouts are verified, as part of the wider economics of crypto mining.