> ## Documentation Index > Fetch the complete documentation index at: https://docs.getpara.com/llms.txt > Use this file to discover all available pages before exploring further. # Sign Typed Data > Signs EIP-712 typed structured data. Only supported for EVM wallets. Computes the EIP-712 hash of the provided domain, types, and message, then signs via MPC. The `EIP712Domain` type is handled automatically and should be omitted from `types`. ## OpenAPI ````yaml /openapi.yaml post /v1/wallets/{walletId}/sign-typed-data openapi: 3.0.3 info: title: Para REST API version: '1.0' description: Server-to-server wallet creation and signing over HTTP servers: - url: https://api.beta.getpara.com description: Beta - url: https://api.getpara.com description: Production security: - ApiKeyAuth: [] paths: /v1/wallets/{walletId}/sign-typed-data: post: tags: - Signing summary: Sign Typed Data description: > Signs EIP-712 typed structured data. Only supported for EVM wallets. Computes the EIP-712 hash of the provided domain, types, and message, then signs via MPC. The `EIP712Domain` type is handled automatically and should be omitted from `types`. operationId: signTypedData parameters: - $ref: '#/components/parameters/WalletId' - $ref: '#/components/parameters/RequestId' - $ref: '#/components/parameters/IdempotencyKey' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SignTypedDataRequest' responses: '200': description: Signature content: application/json: schema: $ref: '#/components/schemas/SignTypedDataResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': description: | Forbidden. Either the API key is invalid (`FORBIDDEN`) or a policy denied the operation (`POLICY_DENIED`). content: application/json: schema: oneOf: - $ref: '#/components/schemas/Error' - $ref: '#/components/schemas/PolicyDeniedError' examples: forbidden: summary: Invalid API key value: code: FORBIDDEN message: invalid secret api key policyDenied: summary: Denied by policy value: code: POLICY_DENIED message: Transaction denied by policy deniedBy: scopeName: signing permissionType: SIGN_MESSAGE '404': $ref: '#/components/responses/NotFound' '409': $ref: '#/components/responses/IdempotencyConflict' '422': $ref: '#/components/responses/Unprocessable' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/ServerError' components: parameters: WalletId: name: walletId in: path required: true description: Wallet ID schema: type: string example: 0a1b2c3d-4e5f-6789-abcd-ef0123456789 RequestId: name: X-Request-Id in: header required: false description: UUID for request tracing. Para returns one if omitted. schema: type: string format: uuid IdempotencyKey: name: Idempotency-Key in: header required: false description: > Unique key for safe retries on POST endpoints. If a request with the same key is received within 24 hours, the original response is returned without re-executing. Recommended format: UUID v4. Max length 256 characters. Returns 422 if the same key is reused with a different request body. Returns 409 if a request with the same key is still being processed. schema: type: string maxLength: 256 schemas: SignTypedDataRequest: type: object required: - typedData properties: typedData: $ref: '#/components/schemas/EIP712TypedData' SignTypedDataResponse: type: object required: - signature properties: signature: type: string description: Hex-encoded signature without `0x` prefix. example: a1b2c3d4e5f6... Error: type: object required: - code - message properties: code: type: string description: Machine-readable error code for programmatic handling example: INVALID_REQUEST message: type: string description: Human-readable error message transactionId: type: string format: uuid description: >- Persisted transaction record id. Present only when a broadcast request failed after a history row was created. failureStage: type: string enum: - mpc_sign - signature_apply - signer_verify - broadcast - monitor_timeout description: >- Which stage of the broadcast lifecycle failed. Present on persisted broadcast failures. failureCode: type: string description: >- Machine-readable failure reason from the underlying broadcast helper (e.g. `INSUFFICIENT_NATIVE_BALANCE`, `EXECUTION_FAILED`). Present on broadcast-stage failures. signedTransaction: type: string description: >- Signed transaction bytes. Present on broadcast failures that happen after signing completed. additionalProperties: true description: > All error responses include `code` and `message` fields. Some errors include extra fields (e.g. `walletId` on 409 Conflict). Broadcast failures that occur after a persisted transaction row is created include `transactionId`, `failureStage`, and (on broadcast-stage failures) `failureCode`, and also set the `x-transaction-id` response header. If signing completed before the failure, `signedTransaction` is included so callers can inspect or retry the already-signed bytes. Common error codes: `INVALID_REQUEST`, `UNAUTHORIZED`, `FORBIDDEN`, `NOT_FOUND`, `CONFLICT`, `WALLET_ALREADY_EXISTS`, `WALLET_ALREADY_CLAIMED`, `RATE_LIMITED`, `INTERNAL_ERROR`. PolicyDeniedError: type: object properties: code: type: string example: POLICY_DENIED message: type: string example: Transaction denied by policy deniedBy: type: object properties: scopeName: type: string permissionType: type: string condition: type: object properties: resource: type: string comparator: type: string reference: {} EIP712TypedData: type: object required: - domain - types - primaryType - message properties: domain: type: object description: EIP-712 domain separator fields example: name: MyDApp version: '1' chainId: 11155111 verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' types: type: object description: >- Type definitions mapping type names to arrays of {name, type} field descriptors. Omit EIP712Domain — it is handled automatically. additionalProperties: type: array items: type: object properties: name: type: string type: type: string example: Mail: - name: from type: address - name: to type: address - name: contents type: string primaryType: type: string description: Primary type name that the message conforms to example: Mail message: type: object description: Structured data to sign example: from: '0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B' to: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' contents: Hello, world! responses: BadRequest: description: Invalid request body content: application/json: schema: $ref: '#/components/schemas/Error' example: code: INVALID_REQUEST message: type must be one of EVM, SOLANA, COSMOS, STELLAR Unauthorized: description: API key not provided content: application/json: schema: $ref: '#/components/schemas/Error' example: code: UNAUTHORIZED message: secret api key not provided NotFound: description: Wallet not found content: application/json: schema: $ref: '#/components/schemas/Error' example: code: NOT_FOUND message: wallet not found IdempotencyConflict: description: A request with this idempotency key is currently being processed content: application/json: schema: $ref: '#/components/schemas/Error' example: code: CONFLICT message: A request with this idempotency key is currently being processed Unprocessable: description: Idempotency key reused with a different request body content: application/json: schema: $ref: '#/components/schemas/Error' example: code: UNPROCESSABLE message: >- Idempotency key has already been used with different request parameters TooManyRequests: description: Rate limit exceeded headers: Retry-After: schema: type: integer description: Seconds until the rate limit window resets example: 60 content: application/json: schema: $ref: '#/components/schemas/Error' example: code: RATE_LIMITED message: Rate limit exceeded, try again shortly. ServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' example: code: INTERNAL_ERROR message: Internal Server Error securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Your partner secret key (server-side only) x-default: sk_your_secret_key_here ````