> ## Documentation Index > Fetch the complete documentation index at: https://docs.immutable.com/llms.txt > Use this file to discover all available pages before exploring further. # Sign a crafting payload > Sign a crafting payload ## OpenAPI ````yaml https://imx-openapiv3-mr-sandbox.s3.us-east-2.amazonaws.com/openapi.json post /v1/chains/{chain_name}/crafting/sign openapi: 3.0.3 info: title: Immutable zkEVM API version: 1.0.0 description: Immutable Multi Rollup API contact: name: Immutable API Support email: support@immutable.com url: https://support.immutable.com servers: - url: https://api.sandbox.immutable.com security: [] tags: - name: activities description: Activities Endpoints x-displayName: activities - name: chains description: Chains Endpoints x-displayName: chains - name: collections description: Collections Endpoints x-displayName: collections - name: nfts description: NFTs Endpoints x-displayName: nfts - name: nft owners description: NFT Owner Endpoints x-displayName: nft owners - name: metadata description: NFT Metadata Endpoints x-displayName: metadata - name: tokens description: ERC20 Token Endpoints x-displayName: tokens - name: demopage description: Temporary HTML endpoint for demo purposes x-displayName: demopage - name: verification x-displayName: verification - name: operatorallowlist x-displayName: operatorallowlist - name: crafting x-displayName: crafting - name: listings description: Listings Endpoints x-displayName: listings - name: orders x-displayName: orders - name: passport description: Passport operations x-displayName: passport - name: gamefi description: team gamefi x-displayName: gamefi - name: health x-displayName: health - name: passport profile description: Passport Profile endpoints x-displayName: passport profile - name: feed-items x-displayName: feed-items - name: assets x-displayName: assets - name: guardian description: Guardian endpoints x-displayName: guardian - name: pricing description: Pricing Endpoints x-displayName: pricing - name: metadata-search x-displayName: metadata-search paths: /v1/chains/{chain_name}/crafting/sign: post: tags: - crafting summary: Sign a crafting payload description: Sign a crafting payload operationId: SignCraftingPayload parameters: - name: chain_name description: The name of chain in: path required: true schema: $ref: '#/components/schemas/ChainName' examples: testnet: value: imtbl-zkevm-testnet summary: Immutable zkEVM Public Testnet requestBody: description: The request body required: true content: application/json: schema: $ref: '#/components/schemas/SignCraftingRequest' responses: '200': description: 200 response content: application/json: schema: $ref: '#/components/schemas/SignCraftingResult' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/UnauthorisedRequest' '403': $ref: '#/components/responses/ForbiddenRequest' '404': $ref: '#/components/responses/NotFound' '500': $ref: '#/components/responses/InternalServerError' security: - ImmutableApiKey: - create:collections components: schemas: ChainName: type: string description: The name of chain example: imtbl-zkevm-testnet SignCraftingRequest: type: object properties: multi_caller: type: object properties: address: $ref: '#/components/schemas/Address' name: type: string description: The name of the multicaller contract example: Multicaller version: type: string description: The version of the multicaller contract example: '1' required: - address - name - version reference_id: type: string description: >- The id of this request in the system that originates the crafting request, specified as a 32 byte hex string example: 67f7d464b8f04f6a9a3b8d3cb4a21af0 calls: type: array description: The calls to be signed items: $ref: '#/components/schemas/Call' minLength: 1 maxLength: 100 expires_at: type: string format: date-time description: The expiration time of the request example: '2022-08-16T17:43:26.991388Z' required: - multi_caller - reference_id - calls - expires_at SignCraftingResult: type: object properties: signer_address: $ref: '#/components/schemas/Address' signature: type: string description: The signature of the request example: '0x8a90cab2b38dba80c64b7734e58ee1db38b8992e' required: - signer_address - signature Address: x-go-type: common.Address x-go-type-import: path: github.com/ethereum/go-ethereum/common name: common description: An Ethereum address type: string example: '0xe9b00a87700f660e46b6f5deaa1232836bcc07d3' pattern: ^0x[a-fA-F0-9]{40}$ Call: type: object properties: target_address: $ref: '#/components/schemas/Address' function_signature: type: string description: The function signature example: mint(address,uint256) function_args: type: array items: type: string description: The function arguments example: - '0x8a90cab2b38dba80c64b7734e58ee1db38b8992e' - '1' required: - target_address - function_signature - function_args APIError400: allOf: - $ref: '#/components/schemas/BasicAPIError' - type: object properties: code: type: string description: Error Code enum: - VALIDATION_ERROR example: VALIDATION_ERROR details: type: object nullable: true description: Additional details to help resolve the error required: - code - details APIError401: allOf: - $ref: '#/components/schemas/BasicAPIError' - type: object properties: code: type: string description: Error Code enum: - UNAUTHORISED_REQUEST example: UNAUTHORISED_REQUEST details: type: object nullable: true description: Additional details to help resolve the error required: - code - details APIError403: allOf: - $ref: '#/components/schemas/BasicAPIError' - type: object properties: code: type: string description: Error Code enum: - AUTHENTICATION_ERROR example: AUTHENTICATION_ERROR details: type: object nullable: true description: Additional details to help resolve the error required: - code - details APIError404: allOf: - $ref: '#/components/schemas/BasicAPIError' - type: object properties: code: type: string description: Error Code enum: - RESOURCE_NOT_FOUND example: RESOURCE_NOT_FOUND details: type: object nullable: true description: Additional details to help resolve the error required: - code - details APIError500: allOf: - $ref: '#/components/schemas/BasicAPIError' - type: object properties: code: type: string description: Error Code enum: - INTERNAL_SERVER_ERROR example: INTERNAL_SERVER_ERROR details: type: object nullable: true description: Additional details to help resolve the error required: - code - details BasicAPIError: type: object properties: message: type: string description: Error Message example: all fields must be provided link: type: string description: Link to IMX documentation that can help resolve this error example: https://docs.x.immutable.com/reference/#/ trace_id: type: string description: Trace ID of the initial request example: e47634b79a5cd6894ddc9639ec4aad26 required: - message - link - trace_id responses: BadRequest: description: Bad Request (400) content: application/json: schema: $ref: '#/components/schemas/APIError400' UnauthorisedRequest: description: Unauthorised Request (401) content: application/json: schema: $ref: '#/components/schemas/APIError401' ForbiddenRequest: description: Forbidden Request (403) content: application/json: schema: $ref: '#/components/schemas/APIError403' NotFound: description: The specified resource was not found (404) content: application/json: schema: $ref: '#/components/schemas/APIError404' InternalServerError: description: Internal Server Error (500) content: application/json: schema: $ref: '#/components/schemas/APIError500' securitySchemes: ImmutableApiKey: x-go-name: ImmutableApiKey type: apiKey in: header name: x-immutable-api-key ````