Tellor is a decentralized oracle network. Tellor was launched in 2019 by a U.S.-based team with the aim to address the oracle problem on the Ethereum blockchain. Tellor's oracle supplies data that can be requested, validated and put on-chain transparently with data reporters competing for incentives of TRB. Data reporters bring valuable information on-chain for a wide range of DeFi applications. Tellor's oracle is a decentralized network of staked data reporters. Becoming a reporter requires no verification process i.e. permissionless. Anyone anywhere in the world can be a reporter using open source software, a unique characteristic among blockchain oracles.