> ## Documentation Index > Fetch the complete documentation index at: https://docs.gelato.cloud/llms.txt > Use this file to discover all available pages before exploring further. # eth_sendUserOperationSync > Sends a `UserOperation` to the specified network and waits for it to be included on-chain. Returns the transaction receipt upon success. ## OpenAPI ````yaml /paymaster-&-bundler/bundler-api-endpoints/erc4337/eth_sendUserOperationSync.json post /rpc/{chainId} openapi: 3.1.0 info: title: eth_sendUserOperationSync version: 1.0.0 servers: - url: https://api.gelato.cloud security: [] paths: /rpc/{chainId}: post: summary: eth_sendUserOperationSync description: >- Sends a `UserOperation` to the specified network and waits for it to be included on-chain. Returns the transaction receipt upon success. parameters: - name: chainId in: path required: true schema: type: number description: Target network chain identifier. - name: payment in: query required: false schema: type: string enum: - sponsored - native - erc20 description: >- Payment method for gas fees. Use 'sponsored' for Gas Tank sponsorship. - name: X-API-Key in: header required: true schema: type: string description: >- Gelato API key for higher rate limits. This must be provided if sponsoring off-chain via Gas Tank. requestBody: content: application/json: schema: $ref: '#/components/schemas/Request' example: id: 1 jsonrpc: '2.0' method: eth_sendUserOperationSync params: - sender: 0x.... nonce: 0x.... factory: 0x.... factoryData: 0x.... callData: 0x.... signature: 0x.... maxFeePerGas: 0x.... maxPriorityFeePerGas: 0x.... callGasLimit: 0x.... verificationGasLimit: 0x.... preVerificationGas: 0x.... paymaster: 0x.... paymasterData: 0x.... paymasterPostOpGasLimit: 0x.... paymasterVerificationGasLimit: 0x.... eip7702Auth: address: 0x.... chainId: 0x.... nonce: 0x.... r: 0x.... s: 0x.... yParity: 0x.... - '0x0000000071727De22E5E9d8BAf0edAc6f37da032' - 60000 required: true responses: '200': description: Successful response content: application/json: schema: $ref: '#/components/schemas/Response' '400': description: Validation error content: application/json: schema: type: object properties: message: type: string components: schemas: Request: type: object properties: id: type: number default: 1 jsonrpc: type: string default: '2.0' method: type: string default: eth_sendUserOperationSync params: type: array description: >- 1. Object - The `UserOperation` object 2. String - The `EntryPoint` address the request should be sent through. This MUST be one of the entry points returned by the `eth_supportedEntryPoints` rpc call. 3. Number - Timeout in milliseconds to wait for transaction inclusion (optional) minItems: 2 maxItems: 3 items: oneOf: - $ref: '#/components/schemas/UserOperationEntryPoint0.7' - $ref: '#/components/schemas/UserOperationEntryPoint0.6' - $ref: '#/components/schemas/EntryPointAddress' - $ref: '#/components/schemas/Timeout' Response: type: object properties: id: type: number default: 1 jsonrpc: type: string default: '2.0' result: $ref: '#/components/schemas/UserOperationReceipt' UserOperationEntryPoint0.7: type: object title: '`UserOperationEntryPoint0.7`' properties: sender: type: string description: >- The address of the account initiating the UserOperation. Can be a counterfactual address if the account is yet to be deployed. nonce: type: string description: >- A unique sequential number used to prevent replay attacks and ensure correct execution ordering. factory: type: string description: >- The address of the contract responsible for deploying the smart account, if the account is not yet deployed. factoryData: type: string description: >- Encoded constructor or init data to be passed to the factory contract for creating the smart account. eip7702Auth: $ref: '#/components/schemas/eip7702Auth' callData: type: string description: >- Encoded data specifying one or more function calls the smart account will execute during the operation. signature: type: string description: >- Cryptographic signature (or authorization data) from the account, used to prove that the operation is valid and authorized. callGasLimit: type: string description: >- The maximum gas allocated for executing the account's internal calls (i.e., the actual transaction logic). verificationGasLimit: type: string description: >- The maximum gas allocated for validating the operation (e.g., account creation, signature verification, etc.). preVerificationGas: type: string description: >- Estimated gas consumed before UserOperation execution (e.g., calldata decoding, signature validation). Bundler is compensated for this gas (0x0 for sponsored payments) maxFeePerGas: type: string description: >- Maximum total gas price (base fee + priority fee) the user is willing to pay per unit of gas (0x0 for sponsored payments) maxPriorityFeePerGas: type: string description: >- Maximum tip (priority fee) per unit of gas to incentivize bundlers (0x0 for sponsored payments) paymaster: type: string description: Paymaster address (Empty for sponsored and native payments) paymasterData: type: string description: Paymaster data (Empty for sponsored and native payments) paymasterPostOpGasLimit: type: string description: >- Paymaster post-operation gas limit (Empty for sponsored and native payments) paymasterVerificationGasLimit: type: string description: >- Paymaster verification gas limit (Empty for sponsored and native payments) required: - sender - nonce - callData - signature - callGasLimit - verificationGasLimit - preVerificationGas - maxFeePerGas - maxPriorityFeePerGas UserOperationEntryPoint0.6: type: object title: '`UserOperationEntryPoint0.6`' properties: sender: type: string description: >- The address of the account initiating the UserOperation. Can be a counterfactual address if the account is yet to be deployed. nonce: type: string description: >- A unique sequential number used to prevent replay attacks and ensure correct execution ordering. initCode: type: string description: Applicable when account is not deployed eip7702Auth: $ref: '#/components/schemas/eip7702Auth' callData: type: string description: >- Encoded data specifying one or more function calls the smart account will execute during the operation. signature: type: string description: >- Cryptographic signature (or authorization data) from the account, used to prove that the operation is valid and authorized. callGasLimit: type: string description: >- The maximum gas allocated for executing the account's internal calls (i.e., the actual transaction logic). verificationGasLimit: type: string description: >- The maximum gas allocated for validating the operation (e.g., account creation, signature verification, etc.). preVerificationGas: type: string description: >- Estimated gas consumed before UserOperation execution (e.g., calldata decoding, signature validation). Bundler is compensated for this gas (0x0 for sponsored payments) maxFeePerGas: type: string description: >- Maximum total gas price (base fee + priority fee) the user is willing to pay per unit of gas (0x0 for sponsored payments) maxPriorityFeePerGas: type: string description: >- Maximum tip (priority fee) per unit of gas to incentivize bundlers (0x0 for sponsored payments) paymasterData: type: string description: Paymaster data (Empty for sponsored and native payments) required: - sender - nonce - callData - signature - callGasLimit - verificationGasLimit - preVerificationGas - maxFeePerGas - maxPriorityFeePerGas EntryPointAddress: type: string title: '`EntryPointAddress`' default: '0x0000000071727De22E5E9d8BAf0edAc6f37da032' Timeout: type: number title: Timeout description: >- Timeout in milliseconds to wait for transaction inclusion. If not provided, defaults to 60000 (60 seconds). default: 60000 example: 60000 UserOperationReceipt: type: object description: Transaction receipt returned when UserOperation is included on-chain properties: userOpHash: type: string description: Hash of the UserOperation example: '0x13574b2256b73bdc33fb121052f64b3803161e5ec602a6dc9e56177ba387e700' entryPoint: type: string description: EntryPoint address used example: '0x0000000071727De22E5E9d8BAf0edAc6f37da032' sender: type: string description: Sender address example: 0x... nonce: type: string description: Nonce used example: '0x0' paymaster: type: string description: Paymaster address (if used) example: 0x... actualGasCost: type: string description: Actual gas cost example: '0x0' actualGasUsed: type: string description: Actual gas used example: '0x0' success: type: boolean description: Whether the UserOperation succeeded example: true reason: type: string description: Revert reason if the UserOperation failed example: '' logs: type: array description: Event logs emitted during execution items: type: object receipt: type: object description: Transaction receipt properties: transactionHash: type: string description: Transaction hash example: 0x... blockHash: type: string description: Block hash example: 0x... blockNumber: type: string description: Block number example: 0x... gasUsed: type: string description: Gas used example: 0x... status: type: string description: Transaction status (1 = success, 0 = failure) example: '0x1' eip7702Auth: type: object title: eip7702Auth description: The authorization object that an EOA account delegates to in EIP-7702 properties: address: type: string description: The address of the authorization chainId: type: string description: The chain Id of the authorization nonce: type: string description: The nonce for the authorization r: type: string description: R parameter of signed authorization s: type: string description: S parameter of signed authorization yParity: type: string description: Y parity parameter of signed authorization ````