What chain is 1inch on?

Could you please elaborate on the blockchain network that 1inch is built upon? I'm curious to understand the underlying infrastructure that supports this decentralized exchange protocol. Given the significance of blockchain choice in terms of scalability, security, and interoperability, I'm interested in knowing if 1inch leverages a major blockchain like Ethereum, Binance Smart Chain, or Polkadot, or if it's operating on a lesser-known yet innovative network. Understanding this aspect could provide valuable insights into the overall architecture and capabilities of 1inch.