Foil is a decentralized protocol for peer-to-peer trading of exposure to onchain resources like gas and blobspace. Using the Foil Protocol, users may supply ETH and offer to buy or sell exposure to a given period's average gas or blobs market at a price expressed via a Uniswap V3 position. When the period ends, position values are automatically fixed at the true average price. Foil aims to mitigate challenges faced by users and builders with tools to stabilize onchain transactional costs. Any users or platform developers with regular onchain transaction requirements may use Foil to help reduce the impact of unexpected congestion pricing.