Merge Pull Request #3241: Add Fee & Gas Spec
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1. **[State](state.md)**
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1. **[State](state.md)**
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1. [Accounts](state.md#accounts)
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1. [Accounts](state.md#accounts)
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1. [Account Interface](state.md#account-interface)
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1. [Account Interface](state.md#account-interface)
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1. [Base Account](state.md#baseaccount)
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2. [Base Account](state.md#baseaccount)
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1. [Vesting Account](state.md#vestingaccount)
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3. [Vesting Account](state.md#vestingaccount)
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1. **[Types](types.md)**
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1. **[Types](types.md)**
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1. [StdFee](types.md#stdfee)
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1. [StdFee](types.md#stdfee)
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1. [StdSignature](types.md#stdsignature)
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2. [StdSignature](types.md#stdsignature)
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1. [StdTx](types.md#stdtx)
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3. [StdTx](types.md#stdtx)
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1. [StdSignDoc](types.md#stdsigndoc)
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4. [StdSignDoc](types.md#stdsigndoc)
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1. **[Keepers](keepers.md)**
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1. **[Keepers](keepers.md)**
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1. [AccountKeeper](keepers.md#account-keeper)
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1. [AccountKeeper](keepers.md#account-keeper)
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1. **[Handlers](handlers.md)**
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1. **[Handlers](handlers.md)**
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1. [Ante Handler](handlers.md#ante-handler)
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1. [Ante Handler](handlers.md#ante-handler)
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1. **[Gas & Fees](gas_fees.md)**
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# Gas & Fees
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Fees serve two purposes for an operator of the network.
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Fees limit the growth of the state stored by every full node and allow for
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general purpose censorship of transactions of little economic value. Fees
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are best suited as an anti-spam mechanism where validators are disinterested in
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the use of the network and identities of users.
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Fees are determined by the gas limits and gas prices transactions provide.
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Operators should set minimum gas prices when starting their nodes. They must set
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the unit costs of gas in each token denomination they wish to support:
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`gaiad start ... --minimum-gas-prices=0.00001steak,0.05photinos`
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When adding transactions to mempool or gossipping transactions, validators check
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if the transaction's gas prices, which are determined by the provided fees, meet
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any of the validator's minimum gas prices. In other words, a transaction must
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provide a fee of at least one denomination that matches a validator's minimum
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gas price.
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Tendermint does not currently provide fee based mempool prioritization, and fee
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based mempool filtering is local to node and not part of consensus. But with
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minimum gas prices set, such a mechanism could be implemented by node operators.
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Because the market value for tokens will fluctuate, validators are expected to
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dynamically adjust their minimum gas prices to a level that would encourage the
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use of the network.
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