# JSON-RPC API

Neo X is in sync with most [Ethereum JSON-RPC](https://ethereum.org/en/developers/docs/apis/json-rpc/) methods, but there are some differences to note:

* `eth_chainId` — returns the chain ID of Neo X.
* `eth_hashrate` — returns `0x0` by default.
* `eth_coinbase` — returns the `GovReward` contract address.
* `eth_gasPrice` — returns the maximum value of the current network GAS price and the lowest allowed GAS price by Neo X Policy.
* `eth_maxPriorityFeePerGas` — returns an estimated value of priority fee to get a transaction allowed by Neo X Policy and in the current block.
* `eth_getUncleByBlockHashAndIndex` — returns `null` by default.
* `eth_getUncleByBlockNumberAndIndex` — returns `null` by default.
* `eth_getUncleCountByBlockHash` — returns `0` by default.
* `eth_getUncleCountByBlockNumber` — returns `0` by default.
* `eth_getCachedTransaction` - returns the cached and signed secret transactions. It requires a valid sender signature in parameters, and only works on nodes configured with `--txpool.amevcache`;
* `eth_envelopeFee` - returns the minimum additional `gastip`/`gasprice` that anti-mev transactions should pay for the service.
* `eth_maxEnvelopeGasLimit` - returns the maximum `gaslimit` that an Envelope can declare for itself.
* `eth_getBlobSidecars` - returns the blob data of a block. It requires a valid block hash or number as the parameter.
* `eth_getBlobSidecarByTxHash` - returns the blob data of a transaction. It requires a valid transaction hash as the parameter.


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