# Base Documentation
> Coinbase's OP-Stack L2. JSON-RPC, OP-Node, Trace, Debug, Flashblocks preconfirmations, Blockbook, and Block Timestamp Lookup.

- [Quicknode Base RPC Overview](https://www.quicknode.com/docs/base.md): Get started with Base RPC on Quicknode. Access reliable, low-latency blockchain infrastructure with globally distributed endpoints for seamless development.

## Making API Requests
- [Base QuickStart](https://www.quicknode.com/docs/base/quickstart.md): Get started with Base RPC on Quicknode. Follow this QuickStart to get up and running with your own Quicknode endpoint and making your first API request to the Base blockchain.
- [Base API Endpoints](https://www.quicknode.com/docs/base/endpoints.md): Learn how to use Base RPC endpoints, make API requests, and handle responses with Quicknode.
- [Base Endpoint Security](https://www.quicknode.com/docs/base/endpoint-security.md): Learn about endpoint security options and how to set up a Quicknode Base RPC endpoint for optimal performance and security.
- [Base Error Code Reference](https://www.quicknode.com/docs/base/error-references.md): Learn about Base error codes, including HTTP, JSON-RPC, and Quicknode's own custom error codes.

## API Reference
- [Base API Overview](https://www.quicknode.com/docs/base/api-overview.md): Overview of supported Base APIs, networks and supported products on Quicknode.

## Ethereum JSON-RPC API
- [eth_accounts RPC Method](https://www.quicknode.com/docs/base/eth_accounts.md): Returns an array of addresses owned by the client. Since Quicknode does not store private keys, this will always return an empty response.
- [eth_blockNumber RPC Method](https://www.quicknode.com/docs/base/eth_blockNumber.md): Returns the latest block number of the blockchain.
- [eth_call RPC Method](https://www.quicknode.com/docs/base/eth_call.md): Executes a new message call immediately without creating a transaction on the block chain.
- [eth_callMany RPC Method](https://www.quicknode.com/docs/base/eth_callMany.md): Executes a list of bundles (a bundle is a collection of transactions), without creating transactions on the blockchain.
- [eth_chainId RPC Method](https://www.quicknode.com/docs/base/eth_chainId.md): Returns the current network/chain ID, used to sign replay-protected transaction introduced in EIP-155.
- [eth_estimateGas RPC Method](https://www.quicknode.com/docs/base/eth_estimateGas.md): Returns an estimation of gas for a given transaction.
- [eth_feeHistory RPC Method](https://www.quicknode.com/docs/base/eth_feeHistory.md): Returns the collection of historical gas information.
- [eth_gasPrice RPC Method](https://www.quicknode.com/docs/base/eth_gasPrice.md): Returns the current gas price on the network in wei.
- [eth_getBalance RPC Method](https://www.quicknode.com/docs/base/eth_getBalance.md): Returns the balance of given account address in wei.
- [eth_getBlockByHash RPC Method](https://www.quicknode.com/docs/base/eth_getBlockByHash.md): Returns information of the block matching the given block hash.
- [eth_getBlockByNumber RPC Method](https://www.quicknode.com/docs/base/eth_getBlockByNumber.md): Returns information of the block matching the given block number.
- [eth_getBlockReceipts RPC Method](https://www.quicknode.com/docs/base/eth_getBlockReceipts.md): Returns all transaction receipts for a given block.
- [eth_getBlockTransactionCountByHash RPC Method](https://www.quicknode.com/docs/base/eth_getBlockTransactionCountByHash.md): Returns the number of transactions for the block matching the given block hash.
- [eth_getBlockTransactionCountByNumber RPC Method](https://www.quicknode.com/docs/base/eth_getBlockTransactionCountByNumber.md): Returns the number of transactions for the block matching the given block number.
- [eth_getCode RPC Method](https://www.quicknode.com/docs/base/eth_getCode.md): Returns the compiled bytecode of a smart contract.
- [eth_getFilterChanges RPC Method](https://www.quicknode.com/docs/base/eth_getFilterChanges.md): Polling method for a filter, which returns an array of events that have occurred since the last poll.
- [eth_getFilterLogs RPC Method](https://www.quicknode.com/docs/base/eth_getFilterLogs.md): Returns an array of all logs matching filter with given id.
- [eth_getLogs RPC Method](https://www.quicknode.com/docs/base/eth_getLogs.md): Returns an array of all logs matching a given filter object.
- [eth_getProof RPC Method](https://www.quicknode.com/docs/base/eth_getProof.md): Returns the account and storage values of the specified account including the Merkle-proof.
- [eth_getStorageAt RPC Method](https://www.quicknode.com/docs/base/eth_getStorageAt.md): Returns the value from a storage position at a given address.
- [eth_getTransactionByBlockHashAndIndex RPC Method](https://www.quicknode.com/docs/base/eth_getTransactionByBlockHashAndIndex.md): Returns information about a transaction given a blockhash and transaction index position.
- [eth_getTransactionByBlockNumberAndIndex RPC Method](https://www.quicknode.com/docs/base/eth_getTransactionByBlockNumberAndIndex.md): Returns information about a transaction given a block number and transaction index position.
- [eth_getTransactionByHash RPC Method](https://www.quicknode.com/docs/base/eth_getTransactionByHash.md): Returns the information about a transaction from a transaction hash.
- [eth_getRawTransactionByHash RPC Method](https://www.quicknode.com/docs/base/eth_getRawTransactionByHash.md): Returns the raw transaction data for a transaction hash.
- [eth_getTransactionCount RPC Method](https://www.quicknode.com/docs/base/eth_getTransactionCount.md): Returns the number of transactions sent from an address.
- [eth_getTransactionReceipt RPC Method](https://www.quicknode.com/docs/base/eth_getTransactionReceipt.md): Returns the receipt of a transaction by transaction hash.
- [eth_getUncleCountByBlockHash RPC Method](https://www.quicknode.com/docs/base/eth_getUncleCountByBlockHash.md): Returns the number of uncles for the block matching the given block hash.
- [eth_getUncleCountByBlockNumber RPC Method](https://www.quicknode.com/docs/base/eth_getUncleCountByBlockNumber.md): Returns the number of uncles for the block matching the given block number.
- [eth_maxPriorityFeePerGas RPC Method](https://www.quicknode.com/docs/base/eth_maxPriorityFeePerGas.md): Get the priority fee needed to be included in a block.
- [eth_newBlockFilter RPC Method](https://www.quicknode.com/docs/base/eth_newBlockFilter.md): Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call eth_getFilterChanges.
- [eth_newFilter RPC Method](https://www.quicknode.com/docs/base/eth_newFilter.md): Creates a filter object, based on filter options, to notify when the state changes (logs). To check if the state has changed, call eth_getFilterChanges.
- [eth_sendRawTransaction RPC Method](https://www.quicknode.com/docs/base/eth_sendRawTransaction.md): Creates new message call transaction or a contract creation for signed transactions. The new API Credit value for this method is 20 when used part of the Core API. If you are using eth_sendRawTransaction as part of a Marketplace add-on, view the add-on's homepage for more information about the specific charge.
- [eth_sendRawTransactionSync RPC Method](https://www.quicknode.com/docs/base/eth_sendRawTransactionSync.md): Broadcasts a raw transaction to the network and synchronously returns the complete transaction receipt once mined, eliminating the need for manual polling.
- [eth_signTransaction RPC Method](https://www.quicknode.com/docs/base/eth_signTransaction.md): Signs a transaction that can be submitted to the network later using eth_sendRawTransaction - not supported by Quicknode!
- [eth_simulateV1 RPC Method](https://www.quicknode.com/docs/base/eth_simulateV1.md): Simulates a series of transactions at a specific block height with optional state overrides. This method allows you to test transactions with custom block and state parameters without actually submitting them to the network.
- [eth_subscribe RPC Method](https://www.quicknode.com/docs/base/eth_subscribe.md): Starts a subscription to a specific event.
- [eth_syncing RPC Method](https://www.quicknode.com/docs/base/eth_syncing.md): Returns an object with the sync status of the node if the node is out-of-sync and is syncing. Returns false when the node is already in sync.
- [eth_uninstallFilter RPC Method](https://www.quicknode.com/docs/base/eth_uninstallFilter.md): It uninstalls a filter with the given filter id.
- [eth_unsubscribe RPC Method](https://www.quicknode.com/docs/base/eth_unsubscribe.md): Cancels an existing subscription so that no further events are sent.
- [net_listening RPC Method](https://www.quicknode.com/docs/base/net_listening.md): Returns true if client is actively listening for network connections.
- [net_peerCount RPC Method](https://www.quicknode.com/docs/base/net_peerCount.md): Returns number of peers currently connected to the client.
- [net_version RPC Method](https://www.quicknode.com/docs/base/net_version.md): Returns the current network id.
- [web3_clientVersion RPC Method](https://www.quicknode.com/docs/base/web3_clientVersion.md): Returns the current version of the chain client.
- [web3_sha3 RPC Method](https://www.quicknode.com/docs/base/web3_sha3.md): Returns Keccak-256 (not the standardized SHA3-256) hash of the given data.

## Debug API
- [debug_getBadBlocks RPC Method](https://www.quicknode.com/docs/base/debug_getBadBlocks.md): Returns a list of the last bad blocks that the client has seen on the network.
- [debug_storageRangeAt RPC Method](https://www.quicknode.com/docs/base/debug_storageRangeAt.md): Returns the contract storage for the specified range.
- [debug_traceBlock RPC Method](https://www.quicknode.com/docs/base/debug_traceBlock.md): Returns a full stack trace of all invoked opcodes of all transactions that were included in a block.
- [debug_traceBlockByHash RPC Method](https://www.quicknode.com/docs/base/debug_traceBlockByHash.md): Returns the possible tracing result number by executing all transactions in the block specified by the block hash with a tracer.
- [debug_traceBlockByNumber RPC Method](https://www.quicknode.com/docs/base/debug_traceBlockByNumber.md): Returns the tracing result by executing all transactions in the block specified by number with a tracer.
- [debug_traceCall RPC Method](https://www.quicknode.com/docs/base/debug_traceCall.md): Returns the number of possible tracing result by executing an eth call within the context of the given block execution.
- [debug_traceTransaction RPC Method](https://www.quicknode.com/docs/base/debug_traceTransaction.md): Returns all traces of a given transaction.

## Flashblocks API
- [Base Flashblocks Overview](https://www.quicknode.com/docs/base/flashblocks/overview.md): Get started with Base Flashblocks RPC on Quicknode. Access reliable, low-latency blockchain infrastructure with globally distributed endpoints for seamless development.
- [eth_call RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_call.md): Executes a new message call immediately without creating a transaction on the block chain.
- [eth_estimateGas RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_estimateGas.md): Returns an estimation of gas for a given transaction.
- [eth_getBalance Flashblock RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getBalance.md): Returns the balance of given account address in wei.
- [eth_getBlockByNumber Flashblock RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getBlockByNumber.md): Returns information of the block matching the given block number.
- [eth_getLogs RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getLogs.md): Returns an array of all logs matching a given filter object.
- [eth_getTransactionByHash Flashblock RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getTransactionByHash.md): Returns the information about a transaction from a transaction hash.
- [eth_getTransactionCount Flashblock RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getTransactionCount.md): Returns the number of transactions sent from an address.
- [eth_getTransactionReceipt Flashblock RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_getTransactionReceipt.md): Returns the receipt of a transaction by transaction hash.
- [eth_simulateV1 RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_simulateV1.md): Simulates a series of transactions at a specific block height with optional state overrides. This method allows you to test transactions with custom block and state parameters without actually submitting them to the network.
- [eth_subscribe RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_subscribe.md): Subscribes to real-time Flashblock events via WebSocket, including new transactions, pending logs, and block state updates.
- [eth_unsubscribe RPC Method](https://www.quicknode.com/docs/base/flashblocks/eth_unsubscribe.md): Cancels an existing subscription so that no further events are sent.

## Trace API
- [trace_block RPC Method](https://www.quicknode.com/docs/base/trace_block.md): Returns traces created at given block (Supported on Erigon).
- [trace_filter RPC Method](https://www.quicknode.com/docs/base/trace_filter.md): Returns traces matching given filter (Supported on Erigon).
- [trace_rawTransaction RPC Method](https://www.quicknode.com/docs/base/trace_rawTransaction.md): Traces a call to eth_sendRawTransaction without making the call, returning the traces(Supported on Erigon).
- [trace_replayBlockTransactions RPC Method](https://www.quicknode.com/docs/base/trace_replayBlockTransactions.md): Replays all transactions in a block returning the requested traces for each transaction (Supported on Erigon).
- [trace_replayTransaction RPC Method](https://www.quicknode.com/docs/base/trace_replayTransaction.md): Replays a transaction, returning the traces (Supported on Erigon).
- [trace_transaction RPC Method](https://www.quicknode.com/docs/base/trace_transaction.md): Returns all traces of given transaction(Supported on Erigon).

## OP-Node Methods
- [optimism_outputAtBlock RPC Method](https://www.quicknode.com/docs/base/optimism_outputAtBlock.md): Returns the output root at a specific block.
- [optimism_syncStatus RPC Method](https://www.quicknode.com/docs/base/optimism_syncStatus.md): Get the synchronization status.
- [optimism_rollupConfig RPC Method](https://www.quicknode.com/docs/base/optimism_rollupConfig.md): Get the rollup configuration parameters.
- [optimism_version RPC Method](https://www.quicknode.com/docs/base/optimism_version.md): Returns the software version.

## Marketplace
- [Supported Marketplace Add-Ons for Base](https://www.quicknode.com/docs/base/marketplace-addons.md): Supported Marketplace Add-Ons for Base

## Block Timestamp Lookup
- [qn_getBlockFromTimestamp RPC Method - Block Timestamp Lookup](https://www.quicknode.com/docs/base/qn_getBlockFromTimestamp.md): Retrieves the most recent block on the blockchain that was generated at or before the specified Unix timestamp (in seconds).
- [qn_getBlocksInTimestampRange RPC Method - Block Timestamp Lookup](https://www.quicknode.com/docs/base/qn_getBlocksInTimestampRange.md): Retrieves all blocks within a specified Unix timestamp range, allowing you to query historical blocks in a defined time window. The response can be paginated to efficiently handle large sets of data, making it useful for detailed analysis across extended time periods.

## Single Flight RPC
- [qn_getBlockWithReceipts RPC Method - Single Flight](https://www.quicknode.com/docs/base/qn_getBlockWithReceipts.md): Returns information about the specified block and the transaction receipts within it.
- [qn_getReceipts RPC Method - Single Flight](https://www.quicknode.com/docs/base/qn_getReceipts.md): Returns transaction receipts for the block specified.