While we’ve touched on tokenomics at a high level in the Polymesh Whitepaper, we have yet to give such an indispensable topic the deep dive it requires. Here we touch on the specific aspects of tokenomics to provide a fulsome understanding of how POLYX operates on Polymesh.
Tokenomics can be explored through how POLYX is supplied, managed, charged, granted, and rewarded on Polymesh, or through the following topics:
- The POLY to POLYX Upgrade Bridge
- Minting of new POLYX for block rewards
- Polymesh Network Treasury
- Transaction fees
- Staking, block rewards, and fines
Diagram 1.1: POLYX Flow on Polymesh
POLYX on Polymesh will not be created from scratch. With the launch of the chain, the main mechanism to build the supply of POLYX is through an upgrade bridge allowing users to upgrade their Ethereum-based POLY utility tokens to POLYX on Polymesh. This upgrade opens the door for users to create and manage security tokens (through Token Studio) and secure the chain (through staking). POLY can be upgraded to POLYX at a 1:1 ratio (i.e. 1,000 POLY = 1,000 POLYX). Polymath recommends that the Polymesh Governing Council maintain the POLY to POLYX Upgrade Bridge for at least one year following the launch of Polymesh mainnet.
Upon the Polymesh mainnet launch, Polymath will upgrade between 240 million and 250 million POLY to POLYX to be deposited in the Polymesh Network Treasury. Newly minted POLYX will be created for block rewards with a maximum of 14% of the total supply minted annually. To prevent the continuous acceleration of inflation, the amount of newly minted POLYX used for rewards will be fixed at 140 million annually once the supply reaches 1 billion POLYX.
The POLY to POLYX Upgrade Bridge is currently available for testing on the Alcyone Testnet.
Polymesh Network Treasury
The Polymesh Network Treasury exists to maintain the network and grow network adoption. It is maintained and managed by the on-chain governance process overseen by the Polymesh Governing Council, accumulating a store of POLYX over time for different community uses. It’s funded in 2 ways:
- A one-time transfer from the Polymath POLY Treasury on Ethereum.
- Chain usage fees - A portion of transaction and protocol fees deposited directly into the Network Treasury.
Network Treasury funds will be disbursed by the Polymesh Governing Council by approving Polymesh Improvement Proposals (PIPs). For the most part, these funds can be then used in 2 ways:
- Improving the network - funding complementary technology, new features, or other maintenance-related tasks
- Securing the network - staking Node Operators as evaluated by the Polymesh Governing Council
Fees are charged in POLYX for all chain usage. They are split between the Network Treasury and Node Operators, or developers who add to the chain with customized functionality. They also operate to protect the chain from DOS or spam attacks. There are 3 classes of fees on Polymesh:
- Transaction fees (gas fees) - fees charged for all transactions on Polymesh. They are a product of the transaction size (in bytes) and the complexity of the transaction, but otherwise charged regardless of the functionality used in a transaction. Fee payment is split at a 4:1 ratio between the Network Treasury and the block-creating Node Operator.
- Protocol fees - charged for certain types of native functions (e.g. reserving token ticker); set by the Polymesh Governing Council. Fee payment is split at a 4:1 ratio between the Network Treasury and the block-creating Node Operator.
- Developer fees - charged and set by developers of smart contracts and smart extensions. While these are not yet activated for Polymesh, further details will be provided on specifics of the mechanism, fee split, and more, determined through the on-chain governance process.
One of the key types of Network Treasury disbursements are grants used to bolster important development on the Polymesh or other activities in support of the chain. Developers who provide an answer and solution to a specific Request for Proposal, or even address unsolicited solutions, may be provided a grant in the form of POLYX.
Grants and their associated development requirements will be managed by the Polymesh Treasury Committee. Further details on the program will be provided in the near future.
Staking secures the network by aligning the economic incentives of Node Operators and Stakers to the correct operation of the chain through rewards and penalties denominated in POLYX. It’s an important aspect of the Nominated Proof-of-Stake consensus mechanism, which defines which blocks get written to the chain as well as the roles, rules, and incentives of Polymesh.
With Polymesh Staking, Node Operators and Stakers work together: Stakers back Node Operators of their choice with POLYX, and both are either rewarded or fined based on the Operator’s performance running their node (i.e. keeping their node online; writing blocks to the chain per the rules of Polymesh). Stakers can be any POLYX holder whose identity has been verified through a customer due diligence process.
Staked POLYX may be simultaneously used to signal support in Polymesh Governance.
Block Rewards and Fines
Block rewards and fines are the carrot and stick vital to Polymesh’s Nominated Proof-of-Stake consensus mechanism, and therefore, proper chain operation. For each block created, the Node Operator who created it is rewarded in POLYX along with their Stakers. Failure to meet the performance standards of the chain, however, could lead to Operators being fined in POLYX; in future, stakers may also be fined pending Governing Council approval. Rewards and fines are calculated and enacted per era (every 24 hours).
The total block rewards pool per era is a product of the nominal rewards rate and the total POLYX staked on Node Operators. They are then split by a number of factors:
- The era rewards are evenly split between Node Operators based on the performance of each node
- The Node Operator commission, a percentage of block rewards claimed by the Operator, is subtracted from that Operator’s payable staking rewards. For Polymesh mainnet launch, the maximum Operator commission will be set to 10% and is subject to change via PIP.
- Remaining block rewards are split as a percentage of POLYX staked on the Node Operator. This includes the Node Operator's stake.
Block rewards are newly minted and rewarded each era, increasing the total supply of POLYX up to a maximum annual inflation rate of 14%. Maximum inflation is reached only with a 70% staking ratio (the amount of POLYX staked v. the total POLYX supply). Block rewards are structured to incentivize this ideal staking ratio. When there is less than 70% POLYX staked on the chain, the rewards rate is higher; but, if the staking ratio is above 70%, there is less incentive to stake on Polymesh due to a lower rewards rate. The ideal staking ratio of 70% was selected because it properly balances security for Polymesh and availability of POLYX.
Diagram 1.2 - Staking Ratio v. Nominal Rewards Rate
The severity of fines on Polymesh is based on the amount of offending Node Operators across the chain. There are two types of infraction that can lead to a fine:
- Unresponsiveness - a node that is experiencing downtime and therefore not connected to Polymesh
- Equivocation or double-signing - the creation of two or more blocks in a single slot; adjustment or rejection of votes on a block. Both of these examples can be signs of collusion.
Fines on Polymesh differ based on infraction type and are applied to the amount of POLYX a Node Operator has staked on their node. In future, if fines are also applied to Stakers, the fine will apply to the entire pool of POLYX staked on the Node Operator.
Diagram 1.3: Fine rate for Equivocation and Unresponsiveness