PoolTogether POOL: DeFi’s Prize Savings Protocol

What if saving money could also give you a chance to win a prize—without putting your deposited funds into a traditional lottery? That is the idea behind PoolTogether. The protocol describes itself as a permissionless prize savings system where users deposit assets, yield generated from those deposits funds prizes, and participants can withdraw their deposits at any time. Its official website says more than 100,000 people have used the protocol to “win by saving.”

Under the hood, PoolTogether uses smart contracts, prize vaults, yield sources, and prize pools to automate this process. Its V5 design goes further by creating an autonomous and permissionless system that can be extended by anyone. Yield from participating vaults is converted into prize liquidity, while users receive chances to win based on their deposits and time-weighted balances.

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What Is PoolTogether POOL?

PoolTogether is an open-source prize savings protocol that combines saving with the opportunity to win prizes. Instead of asking users to spend money on lottery tickets, the protocol is built around deposits that can generate yield. That yield can then be used to fund prizes, while the deposited principal remains available to the depositor. PoolTogether describes its model as “Saving & Winning,” with users depositing funds for a chance to win and yield from deposits helping fund the prize system.

Saving While Having a Chance to Win

The central idea behind PoolTogether is to make saving more engaging by adding a prize component. Users deposit supported assets into prize vaults, where the deposited funds can be directed toward yield-generating strategies. The resulting yield is used to provide prize liquidity, giving depositors opportunities to win without requiring them to purchase conventional lottery tickets.

PoolTogether’s documentation describes the basic process as straightforward:

• Users deposit supported tokens into a prize vault.
• Deposited assets are used with an eligible yield source.
• The yield generated from those deposits is directed toward prize funding.
• Eligible depositors receive opportunities to win prizes.
• Users can withdraw their deposited funds according to the applicable vault and protocol rules.

This structure means that the economic purpose of the deposit is saving and yield generation, while the prize represents an additional potential benefit.

What Is POOL?

POOL is the governance token associated with the PoolTogether ecosystem. It is separate from the underlying assets that users deposit into individual prize vaults. The protocol itself is built from a collection of open-source smart contracts and interfaces that work together to provide prize-savings infrastructure.

Because PoolTogether has evolved through different versions and deployments, the precise role and implementation of POOL can depend on the relevant part of the ecosystem. The important distinction is that POOL is the protocol’s token, while users generally deposit supported assets into specific prize vaults to participate in prize savings.

Permissionless and Automated Infrastructure

PoolTogether places considerable emphasis on making its protocol permissionless, transparent, and automated. Its documentation describes the core system as a permissionless protocol that allows developers to create new prize experiences and integrate different assets or yield sources. The protocol’s smart-contract architecture is designed so that important processes can operate automatically according to predefined rules.

The protocol’s architecture includes several components, including prize pools, prize vaults, draw management, prize claiming, and systems for tracking depositor balances. These components work together to automate the distribution of prizes and the operation of the prize-savings system.

How PoolTogether Differs From a Lottery

The biggest conceptual difference between PoolTogether and a conventional lottery is what happens to the participant’s money. In a traditional lottery, purchasing a ticket generally means spending money for a chance to win. PoolTogether instead structures participation around deposited capital and the yield generated from it. Its official website promotes the model as “No Loss,” with no fees and the ability to withdraw at any time, although the exact mechanics and risks depend on the specific deployment and vault.

PoolTogether therefore combines saving, yield generation, and prize distribution into one DeFi framework. Its goal is to use automated blockchain infrastructure to create a more transparent form of prize-linked savings, where the opportunity to win is connected to saving rather than simply spending money on lottery tickets.

How PoolTogether’s Prize Savings Model Works

PoolTogether’s prize savings model combines saving, yield generation, and prize distribution into a single on-chain system. The basic idea is straightforward: users deposit supported assets into Prize Vaults, those deposits are directed toward yield-generating strategies, and the resulting yield is used to fund prizes. Instead of requiring participants to spend their deposited capital on entries, the protocol is designed so that the yield generated by deposits provides the source of prize liquidity.

1. Users Deposit Assets

The process starts when a user deposits a supported asset into a PoolTogether Prize Vault. The vault records the user’s deposit and makes the funds eligible for the prize mechanism. In the current V5 architecture, Prize Vaults can use compatible ERC-4626 yield sources, allowing different assets and yield-generating strategies to be integrated into the protocol.

The deposit therefore serves two purposes. It gives the user exposure to the underlying savings position while also making the user eligible for prizes. The protocol tracks depositor balances so that prize eligibility can be determined according to the applicable rules.

2. Deposits Generate Yield

Once assets are deposited, the Prize Vault uses an underlying yield source to generate returns. PoolTogether’s documentation explains that the resulting yield is exposed to an external liquidation process, where the yield can be converted into the designated prize token and contributed to the Prize Pool.

This is what makes the model different from a conventional lottery. The deposited principal is not intended to be consumed to finance the prize. Instead, the yield generated by the deposited assets is used to create prize liquidity.

3. Yield Is Distributed as Prizes

The third stage is prize distribution. Yield contributed by Prize Vaults enters the Prize Pool, where it becomes available for prizes. In PoolTogether V5, the Prize Pool operates on each supported chain and releases prize liquidity through draws. The protocol’s documentation describes the process as Prize Vaults contributing prize tokens, a random draw being awarded, and prizes subsequently being claimed or distributed to eligible users.

This creates a simple economic flow:

• Deposit: Users place supported assets into Prize Vaults.
• Yield: The deposited assets generate yield through an underlying strategy.
• Prize: The yield is converted into prize liquidity and distributed to eligible depositors.

Maintaining Access to Deposited Funds

PoolTogether’s model is often described as no-loss prize savings because the protocol is designed so that users can maintain access to their deposited principal rather than spending it on lottery tickets. Its current documentation states that depositors should generally expect to withdraw their full deposit amount, subject to applicable withdrawal limits.

This does not mean that depositing into PoolTogether is completely risk-free. The protocol itself notes an important exception: if an underlying yield source loses assets, depositors may only be able to withdraw a proportional amount of the remaining assets.

Combining Yield From Different Vaults

PoolTogether can also support multiple Prize Vaults contributing prize tokens to a Prize Pool. Its protocol design explains that different vaults can generate yield and contribute the resulting prize tokens, allowing that liquidity to be pooled for prize distribution. In V5, each blockchain deployment has its own Prize Pool, so prize liquidity is isolated by chain.

This pooling structure can make the prize system more flexible because different eligible assets or yield sources can contribute toward the same prize infrastructure within a deployment.

What “No Loss” Really Means

The term “no loss” describes the intended structure of PoolTogether’s prize savings model: users are not supposed to sacrifice their deposited principal simply for the opportunity to win a prize. However, it should not be interpreted as a guarantee against every possible loss.

Smart-contract vulnerabilities, failures or losses in underlying yield sources, asset risks, network issues, and other DeFi-related risks can still affect deposited funds. PoolTogether’s own documentation acknowledges these risks.

PoolTogether’s model is therefore best understood as prize savings rather than a risk-free financial product. The protocol uses yield generated by deposits to fund prizes while attempting to preserve access to users’ deposited capital, creating an alternative approach to lottery-style participation based on saving rather than spending.

PoolTogether Prize Vaults and Yield Sources

Prize Vaults are a core component of PoolTogether’s architecture. They provide the interface through which users deposit assets and become eligible to participate in the protocol’s prize system. Under PoolTogether V5, users are effectively depositing into an ERC-4626 vault that contributes its generated yield to the Prize Pool while the protocol tracks balances for prize eligibility. This design separates the management of deposited assets from the mechanism that distributes prizes.

How Prize Vaults Work

When a user deposits supported tokens into a Prize Vault, the vault records the user’s position for the purpose of prize eligibility. PoolTogether uses its TWAB Controller, or time-weighted average balance system, to track users’ historical balances. This information helps the protocol determine how much exposure a user had during the relevant prize-accrual period.

The basic role of a Prize Vault can therefore be summarized as:

• Accept deposits: Users supply supported assets to an eligible vault.
• Track participation: User balances are recorded through the Twab Controller.
• Generate yield: Deposited assets are connected to an underlying yield source.
• Contribute yield: Generated yield is converted into the designated prize token and sent to the Prize Pool.

This structure means that the deposit itself is used to establish the user’s savings position and prize eligibility, while the yield generated from that position becomes part of the prize system.

Connecting to ERC-4626 Yield Sources

PoolTogether V5 uses the ERC-4626 tokenized vault standard as an important part of its yield infrastructure. The default Prize Vault is an ERC-4626 vault that can use another ERC-4626 vault as its underlying yield-generating source. When creating a vault through the default factory, the creator specifies the address of the underlying ERC-4626 yield vault.

This modular design allows PoolTogether to work with compatible yield-generating infrastructure instead of requiring every Prize Vault to implement its own yield strategy. The Prize Vault essentially acts as a layer connecting deposited assets and the prize mechanism to an underlying source of yield.

From Yield to Prize Liquidity

Yield generated by the underlying ERC-4626 vault does not automatically become a prize. PoolTogether’s V5 architecture exposes the accrued yield to an external liquidator. The liquidator uses a corresponding Liquidation Pair to exchange the yield for the designated prize token. The resulting prize tokens are then transferred to the Prize Pool.

PoolTogether uses a Target Period Dutch Auction mechanism to price these yield liquidations. This allows yield from different vaults to be converted into prize liquidity and combined within the relevant Prize Pool. The protocol documentation explains that this structure allows chance to be distributed proportionally across vaults while creating a single deeper pool of prize liquidity.

A Permissionless Vault Architecture

Another defining characteristic of PoolTogether V5 is its permissionless architecture. The protocol documentation states that anyone can add new tokens or yield sources, while its Prize Vault Factory is designed to make deploying new vaults easier. A Prize Pool can support any number of vaults, allowing developers to build additional prize-saving experiences on top of the core infrastructure.

This extensibility means PoolTogether is not limited to a fixed collection of vaults or yield strategies. Developers can create new vaults that connect compatible assets and yield sources to the existing prize infrastructure.

Prize Vaults serve as the bridge between user deposits, yield-generating strategies, and PoolTogether’s prize system. By combining ERC-4626 compatibility, automated yield liquidation, shared prize liquidity, and permissionless deployment, PoolTogether V5 creates a modular foundation on which different prize-savings applications can be built.

How PoolTogether Turns Yield Into Prizes

PoolTogether’s prize mechanism is built around a simple concept: yield generated from deposited assets is converted into prize liquidity and distributed to participating users. Instead of paying prizes from users’ deposits, the protocol directs the yield produced by Prize Vaults toward the Prize Pool. This creates the foundation for PoolTogether’s prize savings model, where users can maintain their deposits while the generated yield becomes the source of potential rewards.

The Prize Pool as the Center of Prize Liquidity

The Prize Pool is the core contract responsible for holding prize liquidity and disbursing prizes. Within a PoolTogether deployment, participating Prize Vaults contribute liquidity to this shared pool. The protocol’s V5 architecture is designed so that multiple tokens and vaults can contribute to the same prize pool, helping create a larger pool of prize liquidity on that particular deployment.

The process can be simplified into three stages:

• Users deposit assets into Prize Vaults.
• Yield generated by those vaults is liquidated into the designated prize token.
• The resulting prize tokens are transferred to the Prize Pool for distribution.

This structure allows the Prize Pool to serve as a common destination for yield produced across participating vaults.

PoolTogether’s yield-to-prize process connects vault deposits, yield generation, liquidation, and prize distribution into one system. By converting different sources of yield into a common prize asset, the protocol can aggregate liquidity and use the Prize Pool as the central foundation for distributing rewards through its periodic draws.

PoolTogether POOL introduces a distinctive approach to DeFi savings by turning yield into prize opportunities. Users deposit assets into prize vaults; those assets can generate yield, and the resulting yield is converted into prize liquidity rather than requiring participants to spend their principal on lottery tickets. The protocol’s architecture is designed to remain permissionless and automated, with smart contracts handling vault deposits, yield liquidation, prize pools, draws, and distribution.

Its V5 architecture takes this concept further by emphasizing immutability, autonomy, and permissionless expansion. Developers can create new vaults, integrate yield sources, and build custom prize experiences on top of the underlying infrastructure. Meanwhile, mechanisms such as TWAB help determine prize eligibility and winning probabilities based on historical balances.

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PoolTogether POOL is the most important thing to understand about the protocol before focusing on the token. Explore how prize vaults generate yield, how that yield becomes prize liquidity, and how PoolTogether’s permissionless architecture is designed to make saving more engaging through on-chain prize mechanics.