> ## Documentation Index > Fetch the complete documentation index at: https://docs.solanatracker.io/llms.txt > Use this file to discover all available pages before exploring further. # simulateTransaction > Runs the Solana RPC `simulateTransaction` method. ## OpenAPI ````yaml simulatetransaction post / openapi: 3.1.0 info: title: Solana RPC version: 1.0.0 description: Solana RPC HTTP method reference. servers: - url: https://rpc-mainnet.solanatracker.io description: Mainnet RPC endpoint security: [] paths: /: post: summary: Run `simulateTransaction` description: Runs the Solana RPC `simulateTransaction` method. operationId: simulatetransaction requestBody: required: true content: application/json: schema: type: object properties: jsonrpc: allOf: - type: string enum: - '2.0' description: The JSON-RPC protocol version. example: '2.0' default: '2.0' id: allOf: - type: string description: A unique identifier for the request. example: '1' default: '1' method: allOf: - type: string enum: - simulateTransaction description: The name of the RPC method to invoke. example: simulateTransaction default: simulateTransaction params: allOf: - type: array description: Parameters for simulating a transaction. default: - >- AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAEDArczbMia1tLmq7zz4DinMNN0pJ1JtLdqIJPUw3YrGCzYAMHBsgN27lcgB6H2WQvFgyZuJYHa46puOQo9yQ8CVQbd9uHXZaGT2cvhRs7reawctIXtX1s3kTqM9YV+/wCp20C7Wj2aiuk5TReAXo+VTVg8QTHjs0UjNMMKCvpzZ+ABAgEBARU= - encoding: base64 items: oneOf: - type: string description: >- The signed transaction, as an encoded string (base58 or base64). example: >- AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAEDArczbMia1tLmq7zz4DinMNN0pJ1JtLdqIJPUw3YrGCzYAMHBsgN27lcgB6H2WQvFgyZuJYHa46puOQo9yQ8CVQbd9uHXZaGT2cvhRs7reawctIXtX1s3kTqM9YV+/wCp20C7Wj2aiuk5TReAXo+VTVg8QTHjs0UjNMMKCvpzZ+XBAgEBARZU= - type: object description: Configuration object for the simulation. properties: encoding: type: string description: Encoding used for the transaction data. enum: - base58 - base64 example: base64 skipPreflight: type: boolean description: Skip the preflight transaction checks. example: false preflightCommitment: type: string description: Commitment level to use for preflight. enum: - confirmed - finalized - processed example: finalized sigVerify: type: boolean description: If true, verify the transaction signatures. example: false replaceRecentBlockhash: type: boolean description: >- If true, replace the transaction recent blockhash with the most recent one. example: false minContextSlot: type: integer description: >- Minimum slot at which to perform preflight transaction checks. example: 1000 innerInstructions: type: boolean description: >- If true, include inner instructions in the response. example: false accounts: type: object properties: addresses: type: array description: >- Array of accounts to return, as base-58 encoded strings. items: type: string example: >- 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri encoding: type: string description: Encoding format for returned account data. enum: - base64 - base58 - base64+zstd - jsonParsed example: base64 required: - jsonrpc - id - method - params examples: example: value: jsonrpc: '2.0' id: db16f277-1a22-41ff-9f85-f37e2cd77900 method: simulateTransaction params: - >- AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAEDArczbMia1tLmq7zz4DinMNN0pJ1JtLdqIJPUw3YrGCzYAMHBsgN27lcgB6H2WQvFgyZuJYHa46puOQo9yQ8CVQbd9uHXZaGT2cvhRs7reawctIXtX1s3kTqM9YV+/wCp20C7Wj2aiuk5TReAXo+VTVg8QTHjs0UjNMMKCvpzZ+ABAgEBAAU= - encoding: base64 responses: '200': description: Successfully simulated the transaction. content: application/json: schema: type: object properties: jsonrpc: allOf: - type: string enum: - '2.0' description: The JSON-RPC protocol version. example: '2.0' id: allOf: - type: string description: Identifier matching the request. example: '1' result: allOf: - type: object description: Result of the simulated transaction. properties: context: type: object description: Context of the simulation response. properties: apiVersion: type: string description: The API version of the RPC node. example: 2.3.3 slot: type: integer description: Slot in which the data was fetched. example: 393226680 value: type: object description: Details of the simulated transaction result. properties: accounts: type: - array - 'null' items: type: object description: >- Account details associated with the transaction. example: lamports: 5000 owner: >- TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA err: type: - object - 'null' description: >- Error if the transaction failed, null if successful. example: null innerInstructions: type: - array - 'null' description: >- Inner instructions executed during the transaction. example: null loadedAccountsDataSize: type: - integer - 'null' description: >- Total size in bytes of all account data loaded during simulation. example: 413 logs: type: - array - 'null' items: type: string description: >- Program execution logs from the transaction simulation. example: - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb invoke [1] - 'Program log: Instruction: Transfer' - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb consumed 1714 of 200000 compute units - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb success replacementBlockhash: type: - object - 'null' description: >- Replacement blockhash information when replaceRecentBlockhash is enabled. properties: blockhash: type: string description: The replacement blockhash. example: >- 6oFLsE7kmgJx9PjR4R63VRNtpAVJ648gCTr3nq5Hihit lastValidBlockHeight: type: integer description: >- The last valid block height for the replacement blockhash. example: 381186895 returnData: type: - object - 'null' properties: programId: type: string example: >- 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri data: type: array items: type: string example: - Kg== - base64 description: Data returned by the transaction if any. example: null unitsConsumed: type: - integer - 'null' description: >- Total compute units consumed during the simulation. example: 1714 examples: example: value: jsonrpc: '2.0' id: 1 result: context: apiVersion: 2.3.3 slot: 393226680 value: accounts: null err: null innerInstructions: null loadedAccountsDataSize: 413 logs: - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb invoke [1] - 'Program log: Instruction: Transfer' - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb consumed 1714 of 200000 compute units - >- Program TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb success replacementBlockhash: blockhash: 6oFLsE7kmgJx9PjR4R63VRNtpAVJ648gCTr3nq5Hihit lastValidBlockHeight: 381186895 returnData: null unitsConsumed: 1714 security: - ApiKeyQuery: [] components: securitySchemes: ApiKeyQuery: type: apiKey in: query name: api_key ````