# Optimism Documentation > Optimistic rollup L2 on Ethereum. JSON-RPC, OP-Node, Optimism namespace, Trace, Debug, and Flashblocks preconfirmations. - [Quicknode Optimism RPC Overview](https://www.quicknode.com/docs/optimism.md): Get started with Optimism RPC on Quicknode. Access reliable, low-latency infrastructure for Optimism with globally distributed endpoints for fast Layer 2 applications. ## Making API Requests - [Optimism QuickStart](https://www.quicknode.com/docs/optimism/quickstart.md): Get started with Optimism RPC on Quicknode. Follow this QuickStart to get up and running with your own Quicknode endpoint and making your first API request to the Optimism blockchain. - [Optimism API Endpoints](https://www.quicknode.com/docs/optimism/endpoints.md): Learn how to use Optimism RPC endpoints, make API requests, and handle responses with Quicknode. - [Optimism Endpoint Security](https://www.quicknode.com/docs/optimism/endpoint-security.md): Learn about endpoint security options and how to set up a Quicknode Optimism RPC endpoint for optimal performance and security. - [Optimism Error Code Reference](https://www.quicknode.com/docs/optimism/error-references.md): Learn about Optimism error codes, including HTTP, JSON-RPC, and Quicknode's own custom error codes. ## API Reference - [Optimism API Overview](https://www.quicknode.com/docs/optimism/api-overview.md): Overview of supported Optimism APIs and more on Quicknode. ## Ethereum JSON-RPC API - [eth_accounts RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/eth_blockNumber.md): Returns the latest block number of the blockchain. - [eth_call RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/eth_chainId.md): Returns the current network/chain ID, used to sign replay-protected transaction introduced in EIP-155. - [eth_estimateExecutionGas RPC Method](https://www.quicknode.com/docs/optimism/eth_estimateExecutionGas.md): Returns an estimation of gas for a given transaction. - [eth_estimateGas RPC Method](https://www.quicknode.com/docs/optimism/eth_estimateGas.md): Returns an estimation of gas for a given transaction. - [eth_feeHistory RPC Method](https://www.quicknode.com/docs/optimism/eth_feeHistory.md): Returns the collection of historical gas information. - [eth_gasPrice RPC Method](https://www.quicknode.com/docs/optimism/eth_gasPrice.md): Returns the current gas price on the network in wei. - [eth_getBalance RPC Method](https://www.quicknode.com/docs/optimism/eth_getBalance.md): Returns the balance of given account address in wei. - [eth_getBlockByHash RPC Method](https://www.quicknode.com/docs/optimism/eth_getBlockByHash.md): Returns information of the block matching the given block hash. - [eth_getBlockByNumber RPC Method](https://www.quicknode.com/docs/optimism/eth_getBlockByNumber.md): Returns information of the block matching the given block number. - [eth_getBlockReceipts RPC Method](https://www.quicknode.com/docs/optimism/eth_getBlockReceipts.md): Returns all transaction receipts for a given block. - [eth_getBlockTransactionCountByHash RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/eth_getCode.md): Returns the compiled bytecode of a smart contract. - [eth_getFilterChanges RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/eth_getFilterLogs.md): Returns an array of all logs matching filter with given id. - [eth_getLogs RPC Method](https://www.quicknode.com/docs/optimism/eth_getLogs.md): Returns an array of all logs matching a given filter object. - [eth_getProof RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/eth_getStorageAt.md): Returns the value from a storage position at a given address. - [eth_getTransactionByBlockHashAndIndex RPC Method](https://www.quicknode.com/docs/optimism/eth_getTransactionByBlockHashAndIndex.md): Returns information about a transaction given a blockhash and transaction index position. - [eth_getTransactionByBlockNumberAndIndex RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/eth_getTransactionByHash.md): Returns the information about a transaction from a transaction hash. - [eth_getRawTransactionByHash RPC Method](https://www.quicknode.com/docs/optimism/eth_getRawTransactionByHash.md): Returns the raw transaction data for a transaction hash. - [eth_getTransactionCount RPC Method](https://www.quicknode.com/docs/optimism/eth_getTransactionCount.md): Returns the number of transactions sent from an address. - [eth_getTransactionReceipt RPC Method](https://www.quicknode.com/docs/optimism/eth_getTransactionReceipt.md): Returns the receipt of a transaction by transaction hash. - [eth_getUncleCountByBlockHash RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/eth_maxPriorityFeePerGas.md): Get the priority fee needed to be included in a block. - [eth_newBlockFilter RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/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_signTransaction RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/eth_subscribe.md): Starts a subscription to a specific event. - [eth_syncing RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/eth_uninstallFilter.md): It uninstalls a filter with the given filter id. - [eth_unsubscribe RPC Method](https://www.quicknode.com/docs/optimism/eth_unsubscribe.md): Cancels an existing subscription so that no further events are sent. - [net_listening RPC Method](https://www.quicknode.com/docs/optimism/net_listening.md): Returns true if client is actively listening for network connections. - [net_peerCount RPC Method](https://www.quicknode.com/docs/optimism/net_peerCount.md): Returns number of peers currently connected to the client. - [net_version RPC Method](https://www.quicknode.com/docs/optimism/net_version.md): Returns the current network id. - [web3_clientVersion RPC Method](https://www.quicknode.com/docs/optimism/web3_clientVersion.md): Returns the current version of the chain client. - [web3_sha3 RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/debug_storageRangeAt.md): Returns the contract storage for the specified range. - [debug_traceBlock RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/debug_traceBlockByNumber.md): Returns the tracing result by executing all transactions in the block specified by number with a tracer. - [debug_traceTransaction RPC Method](https://www.quicknode.com/docs/optimism/debug_traceTransaction.md): Returns all traces of a given transaction. ## Flashblocks API - [Optimism Flashblocks Overview](https://www.quicknode.com/docs/optimism/flashblocks/overview.md): Get started with Optimism 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/optimism/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/optimism/flashblocks/eth_estimateGas.md): Returns an estimation of gas for a given transaction. - [eth_getBalance Flashblock RPC Method](https://www.quicknode.com/docs/optimism/flashblocks/eth_getBalance.md): Returns the balance of given account address in wei. - [eth_getBlockByNumber Flashblock RPC Method](https://www.quicknode.com/docs/optimism/flashblocks/eth_getBlockByNumber.md): Returns information of the block matching the given block number. - [eth_getLogs RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/flashblocks/eth_getTransactionByHash.md): Returns the information about a transaction from a transaction hash. - [eth_getTransactionCount Flashblock RPC Method](https://www.quicknode.com/docs/optimism/flashblocks/eth_getTransactionCount.md): Returns the number of transactions sent from an address. - [eth_getTransactionReceipt Flashblock RPC Method](https://www.quicknode.com/docs/optimism/flashblocks/eth_getTransactionReceipt.md): Returns the receipt of a transaction by transaction hash. - [eth_simulateV1 RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/flashblocks/eth_unsubscribe.md): Cancels an existing subscription so that no further events are sent. ## OP-Node Methods - [optimism_outputAtBlock RPC Method](https://www.quicknode.com/docs/optimism/optimism_outputAtBlock.md): Returns the output root at a specific block. - [optimism_syncStatus RPC Method](https://www.quicknode.com/docs/optimism/optimism_syncStatus.md): Get the synchronization status. - [optimism_rollupConfig RPC Method](https://www.quicknode.com/docs/optimism/optimism_rollupConfig.md): Get the rollup configuration parameters. - [optimism_version RPC Method](https://www.quicknode.com/docs/optimism/optimism_version.md): Returns the software version. ## Trace API - [trace_block RPC Method](https://www.quicknode.com/docs/optimism/trace_block.md): Returns traces created at given block (Supported on Erigon). - [trace_call RPC Method](https://www.quicknode.com/docs/optimism/trace_call.md): Executes a new message call and returns a number of possible traces (Supported on Erigon). - [trace_callMany RPC Method](https://www.quicknode.com/docs/optimism/trace_callMany.md): Performs multiple call traces on top of the same block. i.e. transaction n will be executed on top of a pending block with all n-1 transactions applied (traced) first. Allows to trace dependent transactions. (Supported on Erigon). - [trace_filter RPC Method](https://www.quicknode.com/docs/optimism/trace_filter.md): Returns traces matching given filter (Supported on Erigon). - [trace_rawTransaction RPC Method](https://www.quicknode.com/docs/optimism/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/optimism/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/optimism/trace_replayTransaction.md): Replays a transaction, returning the traces (Supported on Erigon). - [trace_transaction RPC Method](https://www.quicknode.com/docs/optimism/trace_transaction.md): Returns all traces of given transaction(Supported on Erigon). ## Marketplace - [Supported Marketplace Add-Ons for Optimism](https://www.quicknode.com/docs/optimism/marketplace-addons.md): Supported Marketplace Add-Ons for Optimism ## Single Flight - [qn_getBlockWithReceipts RPC Method - Single Flight](https://www.quicknode.com/docs/optimism/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/optimism/qn_getReceipts.md): Returns transaction receipts for the block specified. ## Synchronous SendTransaction - [eth_sendRawTransactionSync RPC Method](https://www.quicknode.com/docs/optimism/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.