> ## Documentation Index > Fetch the complete documentation index at: https://docs.inprocess.world/llms.txt > Use this file to discover all available pages before exploring further. # Create a Moment > Simulate a moment creation without submitting an onchain transaction. Useful for validating inputs and estimating gas before committing. This endpoint performs two validation steps: 1. **Contract simulation** — validates contract-level logic (no gas spent) 2. **UserOperation preparation** — validates at AA/paymaster level (no broadcast) Uses the same request body schema as `POST /moment/create`. > **Ready to create?** Use [POST /moment/create](/api-reference/moment/create) to broadcast the real transaction. ## OpenAPI ````yaml POST /moment/create/simulate openapi: 3.1.0 info: title: In•Process API description: >- The In•Process API enables browsing and managing moments from timelines. Retrieve moments from a specific artist's timeline, browse the in•process collective timeline, or filter by collection. The API supports creating moments, managing collections, handling payments, and interacting with the In•Process protocol ecosystem. version: 1.0.0 servers: - url: https://api.inprocess.world/api description: Production server security: [] paths: /moment/create/simulate: post: summary: Create a Moment description: >- Simulate a moment creation without submitting an onchain transaction. Useful for validating inputs and estimating gas before committing. This endpoint performs two validation steps: 1. **Contract simulation** — validates contract-level logic (no gas spent) 2. **UserOperation preparation** — validates at AA/paymaster level (no broadcast) Uses the same request body schema as `POST /moment/create`. > **Ready to create?** Use [POST /moment/create](/api-reference/moment/create) to broadcast the real transaction. operationId: simulateCreateMoment requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CreateMomentRequest' responses: '200': description: Successful simulation response content: application/json: schema: $ref: '#/components/schemas/SimulateCreateMomentResponse' '400': description: Bad request content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' security: [] components: schemas: CreateMomentRequest: type: object required: - contract - token - account properties: contract: $ref: '#/components/schemas/MomentContractInput' token: type: object required: - tokenMetadataURI - createReferral - salesConfig - mintToCreatorCount properties: tokenMetadataURI: type: string description: The URI pointing to the token's metadata (e.g., Arweave URI) createReferral: type: string description: >- The address that will receive referral rewards for this moment creation salesConfig: $ref: '#/components/schemas/SalesConfig' mintToCreatorCount: type: number description: >- Number of tokens to mint to the creator upon creation (typically 1) payoutRecipient: type: string description: >- Optional address that will receive sale proceeds. If splits are configured, this will be automatically set to the splits contract address maxSupply: type: integer description: >- Optional maximum number of tokens that can be minted. Must be an integer >= 1. If not provided, the token will be an open edition with unlimited supply minimum: 1 splits: type: array description: >- Optional revenue splits configuration. Must have at least 2 recipients and sum to 100% items: $ref: '#/components/schemas/Split' minItems: 2 account: type: string description: Creator's address chainId: type: integer description: >- Chain ID (optional; defaults to Base mainnet in production and Base Sepolia in preview or development) default: 8453 SimulateCreateMomentResponse: type: object required: - contractSimulation - userOperation properties: contractSimulation: type: object required: - success properties: success: type: boolean description: Whether the contract-level simulation passed userOperation: type: object required: - userOpHash - status properties: userOpHash: type: string description: The user operation hash from the AA/paymaster preparation status: type: string description: Status of the prepared user operation Error: type: object required: - status - message properties: status: type: string enum: - error description: Error status message: type: string description: Error message errors: type: array description: >- Optional array of field-level validation errors. Typically included in 400 Bad Request responses for validation errors. items: type: object required: - field - message properties: field: type: string description: The field name that failed validation message: type: string description: The validation error message for this field MomentContractInput: type: object description: >- Collection target. Provide `address` to mint on an existing ERC-1155 collection, or provide both `name` and `uri` to deploy a new collection in the same request. properties: address: type: string description: Existing collection contract address name: type: string description: >- New collection name (required together with `uri` when `address` is omitted) uri: type: string description: >- New collection metadata URI (required together with `name` when `address` is omitted) SalesConfig: type: object required: - type - pricePerToken - saleStart - saleEnd properties: type: type: string enum: - fixedPrice - erc20Mint description: The sale type pricePerToken: oneOf: - type: string - type: integer - type: number description: >- Price per token in wei (18 decimals), as a decimal integer string or JSON number. For example, "100000000000000000" or 100000000000000000 represents 0.1 ETH saleStart: oneOf: - type: string - type: integer - type: number description: >- Sale start time: Unix timestamp as a decimal integer string or JSON number saleEnd: oneOf: - type: string - type: integer - type: number description: >- Sale end time: Unix timestamp as a decimal integer string or JSON number currency: type: string description: >- Optional ERC20 token address. If not provided, defaults to the native token (ETH) Split: type: object required: - address - percentAllocation properties: address: type: string description: Recipient address for revenue sharing percentAllocation: type: number description: Allocation percentage (0-100) minimum: 0 maximum: 100 ````