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Official Go implementation of the Ethereum protocol
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go-ethereum/docs/_legacy/Gas-Price-Oracle.md

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[DOCS] massive documentation update (#20229) This PR: - reorganizes all documentation pages so they live in the right category - removes lots of legacy docs - contains many improvements to active documentation pages Geth user documentation is now spread across five major categories: - Install and Build: installation and compile instructions - Using Geth: this is for pages about general geth usage. - For dApp Developers: this is for programming guides and functionality specific to dapp development. All the dev guides for mobile framework and Go APIs live here. - JSON-RPC APIs: this has its own section because there is now a sub-page for every name space. I have also added an overview text that explains how to set up the API servers. - For Geth Developers: this is for geth contributors
5 years ago
---
title: Gas price oracle
---
The gas price oracle is a helper function of the Geth client that tries to find an
appropriate default gas price when sending transactions. It can be parametrized with the
following command line options:
- `gpomin`: lower limit of suggested gas price. This should be set at least as high as the
`gasprice` setting usually used by miners so that your transactions will not be rejected
automatically because of a too low price.
- `gpomax`: higher limit of suggested gas price. During load peaks when there is a
competition between transactions to get into the blocks, the price needs to be limited,
otherwise the oracle would eventually try to overbid everyone else at any price.
- `gpofull`: a block is considered "full" when a certain percentage of the block gas limit
(specified in percents) is used up by transactions. If a block is not "full", that means
that a transaction could have been accepted even with a minimal price offered.
- `gpobasedown`: an exponential ratio (specified in `1/1000ths`) by which the base price
decreases when the lowest acceptable price of the last block is below the last base
price.
- `gpobaseup`: an exponential ratio (specified in `1/1000ths`) by which the base price
increases when the lowest acceptable price of the last block is over the last base
price.
- `gpobasecf`: a correction factor (specified in percents) of the base price. The
suggested price is the corrected base price, limited by `gpomin` and `gpomax`.
The lowest acceptable price is defined as a price that could have been enough to insert a
transaction into a certain block. Although this value varies slightly with the gas used by
the particular transaction, it is aproximated as follows: if the block is full, it is the
lowest transaction gas price found in that block. If the block is not full, it equals to
gpomin.
The base price is a moving value that is adjusted from block to block, up if it was lower
than the lowest acceptable price, down otherwise. Note that there is a slight amount of
randomness added to the correction factors so that your client will not behave absolutely
predictable on the market.
If you want to specify a constant for the default gas price and not use the oracle, set
both `gpomin` and `gpomax` to the same value.