Sweetbridge is a technology stack and project alliance that solves four basic problems: 1. Lack of liquidity in supply chains, by creating an innovative collateralized liquidity economy; 2. Resource underutilization, by enabling asset sharing across organizational boundaries; 3. Suboptimal supply chain operations, by providing access to liquid professional talent and creating incentives for supply chain professionals to provide services based on objective measurements of outcomes; 4. Accelerating pace and scale of change, by creating more flexible and adaptive supply chains. To address these problems, Sweetbridge proposes to create a layered blockchain-based protocol stack in the service of a broad ecosystem of supply chain projects. The Sweetbridge project is a combination of bottom-up technologies together with a consortium of project alliances managed by a nonprofit foundation. he Sweetbridge protocol stack will be composed of five layers for (1) liquidity, (2) settlement, (3) accounting, (4) resource-sharing, and (5) optimization. This work first provides a high-level overview of the Sweetbridge vision and explains how it improves upon existing solutions applicable to supply chains. Next, we focus on the liquidity layer as a first step in the implementation roadmap. Subsequently, we present a proof-of-concept implementation of the liquidity layer using cryptocurrency as collateral. We conclude with the structure of our token offering that is designed to both help fund the project and jumpstart its ecosystem. This effort is the first in a series of projects that will lead to a new economic framework for all commerce, compatible with existing economies and regulatory frameworks but rethinking implementation with a heavy emphasis on next-generation technologies including artificial intelligence, internet of things, and blockchains. The Sweetbridge protocol provides a better way to finance commerce, efficiently utilize assets, and compensate participants.