Fees & the tXDS coin
The coin
| Mainnet coin | XDS (no mainnet exists yet) |
| Testnet / dev coin | tXDS |
| Decimals | 18 |
| Smallest unit | "dev": 1 XDS = 10¹⁸ dev (the same ratio as ETH to wei) |
tXDS has no value
Testnet tokens have no monetary value, are free from the faucet, must never be sold, and will not convert to mainnet XDS.
How fees work (EIP-1559)
xDEVS Chain uses Ethereum's EIP-1559 fee model, so wallets estimate fees exactly as on Ethereum.
- Every block has a base fee that rises when blocks are more than half full and falls when they are less than half full, by at most 12.5% per block.
- The base fee never drops below a minimum of 0.1 gwei (an anti-spam floor).
- Users add a priority fee (tip) on top.
Where the fee goes
| Part | Destination |
|---|---|
| Base fee × gas used, 80% | Burned |
| Base fee × gas used, 20% | Treasury contract (0x…1002), spent on grants and public goods by governance |
| Priority fee (tip) | The block producer's fee recipient (--fee-recipient on the dev node) |
This split works today on the dev chain. Under heavy use the burn can exceed new issuance, making the supply deflationary.
Dev chain values
From the built-in dev genesis:
| Parameter | Value |
|---|---|
| Initial base fee | 1 gwei |
| Minimum base fee | 0.1 gwei |
| Elasticity (target = gas limit / 2) | 2 |
| Max change denominator (12.5%) | 8 |
| Burn share | 8,000 bps (80%) |
| Block gas limit | 30,000,000 |
| Block time | 2 s |
On the dev node, the default --fee-recipient is the zero address, so tips go there unless you set one.
Governance
On the public networks, the FeeConfig contract (0x…1003) holds parameters such as the gas limit, minimum base fee and burn share, and only Governance (a stake-weighted vote plus a timelock) can change them. FeeConfig is built and tested but not yet wired into the dev genesis.
Planned: local fee markets (Phase 5)
On Ethereum, one popular mint makes everyone pay more. xDEVS Chain plans local fee markets: if a single contract uses more than 25% of block gas, transactions to it pay an extra local base fee that rises and decays like EIP-1559, while everyone else keeps paying the normal fee. The price will be exposed through xdevs_localFee(address). The first version is keyed by the top-level to address only.
Planned: gas sponsorship
Apps can pay their users' gas through the paymaster, and an example paymaster accepts approved stablecoins. These are built as contracts; using them on a network needs the predeploys and an ERC-4337 bundler.
Planned testnet supply
These numbers are from the implementation plan and apply to the future public testnet only. Mainnet tokenomics will be designed separately, with legal advice.
| Genesis supply | 1,000,000,000 tXDS |
| Issuance | 7% in year 1, −1% per year, floor 2%, paid as staking rewards |
| Burn | 80% of base fees |
| Genesis allocation | Share |
|---|---|
| Faucet & community reserve | 30% |
| Ecosystem grants | 25% |
| Treasury (governance) | 20% |
| Core development | 15% |
| Genesis validators' stake | 5% |
| Reserve (incentivized testnet) | 5% |